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feat: add OpenAI spec updates for GPT-5.x and o-series models
VAP-11729 - Add 'developer' role to OpenAiMessageRole enum for GPT-5.x and o-series models - Add deprecation notice for 'function' role in favor of 'tool' - Add new optional API parameters to OpenAiModel interface: - seed: for deterministic sampling - topP: nucleus sampling parameter - frequencyPenalty: penalize repeated tokens - presencePenalty: encourage new topics - logprobs: return token log probabilities - topLogprobs: number of top log probabilities to return - parallelToolCalls: enable parallel function calling - reasoningEffort: control reasoning depth for o1/o3 models - Add OpenAiModelReasoningEffort type with low/medium/high options - Add comprehensive unit tests for all changes All changes are backward compatible and follow existing code patterns. Co-Authored-By: Claude <noreply@anthropic.com>
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.fernignore

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# Specify files that shouldn't be modified by Fern
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README.md
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tests/unit/types/OpenAiMessageRole.test.ts
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tests/unit/types/OpenAiModelReasoningEffort.test.ts
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tests/unit/types/OpenAiModel.test.ts
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tests/custom.test.ts

src/api/types/OpenAiMessageRole.ts

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// This file was auto-generated by Fern from our API Definition.
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/**
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* Roles for OpenAI messages.
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*
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* Note: The "function" role is deprecated in favor of "tool". Use "tool" for new implementations.
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* The "developer" role is required for GPT-5.x and o-series models.
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*/
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export const OpenAiMessageRole = {
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Assistant: "assistant",
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/**
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* @deprecated The "function" role is deprecated in favor of "tool". Use "tool" for new implementations.
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* @see https://platform.openai.com/docs/guides/function-calling
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*/
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Function: "function",
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User: "user",
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System: "system",
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Tool: "tool",
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/**
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* The "developer" role is used for system-level instructions in GPT-5.x and o-series models.
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* It provides a way to set high-level instructions that take precedence over user messages.
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* @see https://platform.openai.com/docs/guides/text-generation
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*/
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Developer: "developer",
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} as const;
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export type OpenAiMessageRole = (typeof OpenAiMessageRole)[keyof typeof OpenAiMessageRole];

src/api/types/OpenAiModel.ts

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* @default 0
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*/
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numFastTurns?: number;
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/**
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* If specified, the system will make a best effort to sample deterministically,
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* such that repeated requests with the same seed and parameters should return the same result.
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* Determinism is not guaranteed.
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*
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* @see https://platform.openai.com/docs/api-reference/chat/create#chat-create-seed
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*/
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seed?: number;
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/**
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* An alternative to sampling with temperature, called nucleus sampling,
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* where the model considers the results of the tokens with top_p probability mass.
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* So 0.1 means only the tokens comprising the top 10% probability mass are considered.
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*
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* We generally recommend altering this or temperature but not both.
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*
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* @default 1
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* @see https://platform.openai.com/docs/api-reference/chat/create#chat-create-top_p
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*/
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topP?: number;
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/**
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* Number between -2.0 and 2.0. Positive values penalize new tokens based on their existing
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* frequency in the text so far, decreasing the model's likelihood to repeat the same line verbatim.
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*
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* @default 0
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* @see https://platform.openai.com/docs/api-reference/chat/create#chat-create-frequency_penalty
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*/
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frequencyPenalty?: number;
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/**
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* Number between -2.0 and 2.0. Positive values penalize new tokens based on whether they
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* appear in the text so far, increasing the model's likelihood to talk about new topics.
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*
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* @default 0
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* @see https://platform.openai.com/docs/api-reference/chat/create#chat-create-presence_penalty
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*/
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presencePenalty?: number;
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/**
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* Whether to return log probabilities of the output tokens or not.
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* If true, returns the log probabilities of each output token returned in the content of message.
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*
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* @default false
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* @see https://platform.openai.com/docs/api-reference/chat/create#chat-create-logprobs
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*/
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logprobs?: boolean;
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/**
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* An integer between 0 and 20 specifying the number of most likely tokens to return at each
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* token position, each with an associated log probability. logprobs must be set to true if
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* this parameter is used.
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*
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* @see https://platform.openai.com/docs/api-reference/chat/create#chat-create-top_logprobs
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*/
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topLogprobs?: number;
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/**
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* Whether to enable parallel function calling during tool use.
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* When set to true, the model can call multiple functions in a single response.
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*
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* @default true
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* @see https://platform.openai.com/docs/guides/function-calling#parallel-function-calling
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*/
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parallelToolCalls?: boolean;
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/**
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* Constrains effort on reasoning for reasoning models (o1, o3, etc.).
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* Reducing reasoning effort can result in faster responses and fewer tokens used on reasoning in a response.
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*
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* Possible values: "low", "medium", "high"
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*
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* @default "medium"
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* @see https://platform.openai.com/docs/api-reference/chat/create#chat-create-reasoning_effort
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*/
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reasoningEffort?: Vapi.OpenAiModelReasoningEffort;
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}
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// This file was auto-generated by Fern from our API Definition.
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/**
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* Constrains effort on reasoning for reasoning models (o1, o3, etc.).
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* Reducing reasoning effort can result in faster responses and fewer tokens used on reasoning in a response.
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*
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* @default "medium"
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* @see https://platform.openai.com/docs/api-reference/chat/create#chat-create-reasoning_effort
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*/
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export const OpenAiModelReasoningEffort = {
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Low: "low",
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Medium: "medium",
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High: "high",
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} as const;
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export type OpenAiModelReasoningEffort = (typeof OpenAiModelReasoningEffort)[keyof typeof OpenAiModelReasoningEffort];

src/api/types/index.ts

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export * from "./OpenAiModelModel.js";
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export * from "./OpenAiModelPromptCacheRetention.js";
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export * from "./OpenAiModelProvider.js";
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export * from "./OpenAiModelReasoningEffort.js";
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export * from "./OpenAiModelToolStrictCompatibilityMode.js";
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export * from "./OpenAiModelToolsItem.js";
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export * from "./OpenAiTranscriber.js";
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/**
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* Tests for OpenAiMessageRole enum
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* VAP-11729: Update server-sdk-typescript SDK with OpenAI spec updates
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*/
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import { describe, it, expect } from "vitest";
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import { OpenAiMessageRole } from "../../../src/api/types/OpenAiMessageRole.js";
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describe("OpenAiMessageRole", () => {
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describe("enum values", () => {
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it("should have 'assistant' role", () => {
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expect(OpenAiMessageRole.Assistant).toBe("assistant");
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});
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it("should have 'function' role (deprecated)", () => {
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expect(OpenAiMessageRole.Function).toBe("function");
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});
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it("should have 'user' role", () => {
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expect(OpenAiMessageRole.User).toBe("user");
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});
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it("should have 'system' role", () => {
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expect(OpenAiMessageRole.System).toBe("system");
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});
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it("should have 'tool' role", () => {
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expect(OpenAiMessageRole.Tool).toBe("tool");
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});
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it("should have 'developer' role for GPT-5.x and o-series models", () => {
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expect(OpenAiMessageRole.Developer).toBe("developer");
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});
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});
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describe("type safety", () => {
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it("should accept valid role values", () => {
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const roles: OpenAiMessageRole[] = [
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OpenAiMessageRole.Assistant,
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OpenAiMessageRole.Function,
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OpenAiMessageRole.User,
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OpenAiMessageRole.System,
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OpenAiMessageRole.Tool,
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OpenAiMessageRole.Developer,
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];
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expect(roles).toHaveLength(6);
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expect(roles).toContain("assistant");
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expect(roles).toContain("function");
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expect(roles).toContain("user");
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expect(roles).toContain("system");
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expect(roles).toContain("tool");
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expect(roles).toContain("developer");
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});
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it("should have all expected roles defined", () => {
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const expectedRoles = ["assistant", "function", "user", "system", "tool", "developer"];
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const actualRoles = Object.values(OpenAiMessageRole);
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expect(actualRoles.sort()).toEqual(expectedRoles.sort());
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});
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});
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describe("backward compatibility", () => {
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it("should maintain existing role string values", () => {
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// Ensure existing roles haven't changed their string values
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expect(OpenAiMessageRole.Assistant).toBe("assistant");
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expect(OpenAiMessageRole.Function).toBe("function");
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expect(OpenAiMessageRole.User).toBe("user");
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expect(OpenAiMessageRole.System).toBe("system");
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expect(OpenAiMessageRole.Tool).toBe("tool");
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});
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});
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});
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/**
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* Tests for OpenAiModel interface
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* VAP-11729: Update server-sdk-typescript SDK with OpenAI spec updates
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*/
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import { describe, it, expect } from "vitest";
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import type { OpenAiModel } from "../../../src/api/types/OpenAiModel.js";
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import { OpenAiModelReasoningEffort } from "../../../src/api/types/OpenAiModelReasoningEffort.js";
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describe("OpenAiModel", () => {
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describe("new optional parameters", () => {
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it("should allow creating a model config with seed parameter", () => {
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const model: Partial<OpenAiModel> = {
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seed: 42,
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};
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expect(model.seed).toBe(42);
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});
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it("should allow creating a model config with topP parameter", () => {
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const model: Partial<OpenAiModel> = {
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topP: 0.9,
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};
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expect(model.topP).toBe(0.9);
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});
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it("should allow creating a model config with frequencyPenalty parameter", () => {
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const model: Partial<OpenAiModel> = {
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frequencyPenalty: 0.5,
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};
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expect(model.frequencyPenalty).toBe(0.5);
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});
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it("should allow creating a model config with presencePenalty parameter", () => {
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const model: Partial<OpenAiModel> = {
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presencePenalty: 0.3,
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};
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expect(model.presencePenalty).toBe(0.3);
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});
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it("should allow creating a model config with logprobs parameter", () => {
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const model: Partial<OpenAiModel> = {
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logprobs: true,
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};
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expect(model.logprobs).toBe(true);
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});
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it("should allow creating a model config with topLogprobs parameter", () => {
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const model: Partial<OpenAiModel> = {
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logprobs: true,
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topLogprobs: 5,
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};
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expect(model.topLogprobs).toBe(5);
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});
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it("should allow creating a model config with parallelToolCalls parameter", () => {
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const model: Partial<OpenAiModel> = {
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parallelToolCalls: false,
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};
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expect(model.parallelToolCalls).toBe(false);
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});
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it("should allow creating a model config with reasoningEffort parameter", () => {
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const model: Partial<OpenAiModel> = {
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reasoningEffort: OpenAiModelReasoningEffort.High,
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};
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expect(model.reasoningEffort).toBe("high");
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});
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});
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describe("parameter validation (conceptual)", () => {
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it("should accept valid topP values (0 to 1)", () => {
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const validValues = [0, 0.1, 0.5, 0.9, 1];
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validValues.forEach((value) => {
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const model: Partial<OpenAiModel> = { topP: value };
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expect(model.topP).toBe(value);
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});
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});
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it("should accept valid frequency_penalty values (-2.0 to 2.0)", () => {
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const validValues = [-2.0, -1.0, 0, 1.0, 2.0];
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validValues.forEach((value) => {
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const model: Partial<OpenAiModel> = { frequencyPenalty: value };
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expect(model.frequencyPenalty).toBe(value);
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});
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});
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it("should accept valid presence_penalty values (-2.0 to 2.0)", () => {
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const validValues = [-2.0, -1.0, 0, 1.0, 2.0];
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validValues.forEach((value) => {
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const model: Partial<OpenAiModel> = { presencePenalty: value };
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expect(model.presencePenalty).toBe(value);
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});
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});
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it("should accept valid topLogprobs values (0 to 20)", () => {
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const validValues = [0, 5, 10, 15, 20];
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validValues.forEach((value) => {
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const model: Partial<OpenAiModel> = { topLogprobs: value };
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expect(model.topLogprobs).toBe(value);
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});
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});
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});
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describe("backward compatibility", () => {
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it("should maintain existing temperature parameter", () => {
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const model: Partial<OpenAiModel> = {
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temperature: 0.7,
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};
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expect(model.temperature).toBe(0.7);
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});
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it("should maintain existing maxTokens parameter", () => {
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const model: Partial<OpenAiModel> = {
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maxTokens: 1000,
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};
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expect(model.maxTokens).toBe(1000);
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});
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it("should allow combining old and new parameters", () => {
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const model: Partial<OpenAiModel> = {
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temperature: 0.7,
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maxTokens: 1000,
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topP: 0.9,
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frequencyPenalty: 0.5,
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presencePenalty: 0.3,
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seed: 42,
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logprobs: true,
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topLogprobs: 5,
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parallelToolCalls: true,
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reasoningEffort: OpenAiModelReasoningEffort.Medium,
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};
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expect(model.temperature).toBe(0.7);
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expect(model.maxTokens).toBe(1000);
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expect(model.topP).toBe(0.9);
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expect(model.frequencyPenalty).toBe(0.5);
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expect(model.presencePenalty).toBe(0.3);
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expect(model.seed).toBe(42);
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expect(model.logprobs).toBe(true);
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expect(model.topLogprobs).toBe(5);
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expect(model.parallelToolCalls).toBe(true);
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expect(model.reasoningEffort).toBe("medium");
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});
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});
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describe("reasoning models (o1, o3 series)", () => {
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it("should support reasoningEffort for o-series models", () => {
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const lowEffort: Partial<OpenAiModel> = {
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reasoningEffort: OpenAiModelReasoningEffort.Low,
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};
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const mediumEffort: Partial<OpenAiModel> = {
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reasoningEffort: OpenAiModelReasoningEffort.Medium,
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};
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const highEffort: Partial<OpenAiModel> = {
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reasoningEffort: OpenAiModelReasoningEffort.High,
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};
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expect(lowEffort.reasoningEffort).toBe("low");
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expect(mediumEffort.reasoningEffort).toBe("medium");
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expect(highEffort.reasoningEffort).toBe("high");
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});
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});
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});

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