diff --git a/.changeset/add-claude-sonnet-4-6.md b/.changeset/add-claude-sonnet-4-6.md
new file mode 100644
index 000000000..644039025
--- /dev/null
+++ b/.changeset/add-claude-sonnet-4-6.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/ai-anthropic': minor
+---
+
+Add `claude-sonnet-4-6` model metadata to the Anthropic adapter, including 1M native context window and adaptive thinking support.
diff --git a/examples/ts-react-chat/src/lib/model-selection.ts b/examples/ts-react-chat/src/lib/model-selection.ts
index 0d0b04c57..95c122cd4 100644
--- a/examples/ts-react-chat/src/lib/model-selection.ts
+++ b/examples/ts-react-chat/src/lib/model-selection.ts
@@ -20,6 +20,11 @@ export const MODEL_OPTIONS: Array<ModelOption> = [
   { provider: 'openai', model: 'gpt-5', label: 'OpenAI - GPT-5' },
 
   // Anthropic
+  {
+    provider: 'anthropic',
+    model: 'claude-sonnet-4-6',
+    label: 'Anthropic - Claude Sonnet 4.6',
+  },
   {
     provider: 'anthropic',
     model: 'claude-sonnet-4-5-20250929',
diff --git a/packages/typescript/ai-anthropic/src/model-meta.ts b/packages/typescript/ai-anthropic/src/model-meta.ts
index ec7ca7807..82302ac02 100644
--- a/packages/typescript/ai-anthropic/src/model-meta.ts
+++ b/packages/typescript/ai-anthropic/src/model-meta.ts
@@ -108,6 +108,37 @@ const CLAUDE_OPUS_4_5 = {
     AnthropicSamplingOptions
 >
 
+const CLAUDE_SONNET_4_6 = {
+  name: 'claude-sonnet-4-6',
+  id: 'claude-sonnet-4-6',
+  context_window: 1_000_000,
+  max_output_tokens: 64_000,
+  knowledge_cutoff: '2025-08-01',
+  pricing: {
+    input: {
+      normal: 3,
+    },
+    output: {
+      normal: 15,
+    },
+  },
+  supports: {
+    input: ['text', 'image', 'document'],
+    extended_thinking: true,
+    adaptive_thinking: true,
+    priority_tier: true,
+  },
+} as const satisfies ModelMeta<
+  AnthropicContainerOptions &
+    AnthropicContextManagementOptions &
+    AnthropicMCPOptions &
+    AnthropicServiceTierOptions &
+    AnthropicStopSequencesOptions &
+    AnthropicThinkingOptions &
+    AnthropicToolChoiceOptions &
+    AnthropicSamplingOptions
+>
+
 const CLAUDE_SONNET_4_5 = {
   name: 'claude-sonnet-4-5',
   id: 'claude-sonnet-4-5',
@@ -395,6 +426,7 @@ const CLAUDE_HAIKU_3 = {
 export const ANTHROPIC_MODELS = [
   CLAUDE_OPUS_4_6.id,
   CLAUDE_OPUS_4_5.id,
+  CLAUDE_SONNET_4_6.id,
   CLAUDE_SONNET_4_5.id,
   CLAUDE_HAIKU_4_5.id,
   CLAUDE_OPUS_4_1.id,
@@ -432,6 +464,14 @@ export type AnthropicChatModelProviderOptionsByName = {
     AnthropicThinkingOptions &
     AnthropicToolChoiceOptions &
     AnthropicSamplingOptions
+  [CLAUDE_SONNET_4_6.id]: AnthropicContainerOptions &
+    AnthropicContextManagementOptions &
+    AnthropicMCPOptions &
+    AnthropicServiceTierOptions &
+    AnthropicStopSequencesOptions &
+    AnthropicThinkingOptions &
+    AnthropicToolChoiceOptions &
+    AnthropicSamplingOptions
   [CLAUDE_SONNET_4_5.id]: AnthropicContainerOptions &
     AnthropicContextManagementOptions &
     AnthropicMCPOptions &
@@ -513,6 +553,7 @@ export type AnthropicChatModelProviderOptionsByName = {
 export type AnthropicModelInputModalitiesByName = {
   [CLAUDE_OPUS_4_6.id]: typeof CLAUDE_OPUS_4_6.supports.input
   [CLAUDE_OPUS_4_5.id]: typeof CLAUDE_OPUS_4_5.supports.input
+  [CLAUDE_SONNET_4_6.id]: typeof CLAUDE_SONNET_4_6.supports.input
   [CLAUDE_SONNET_4_5.id]: typeof CLAUDE_SONNET_4_5.supports.input
   [CLAUDE_HAIKU_4_5.id]: typeof CLAUDE_HAIKU_4_5.supports.input
   [CLAUDE_OPUS_4_1.id]: typeof CLAUDE_OPUS_4_1.supports.input
diff --git a/packages/typescript/ai-anthropic/tests/model-meta.test.ts b/packages/typescript/ai-anthropic/tests/model-meta.test.ts
index 842e8c049..0caddc281 100644
--- a/packages/typescript/ai-anthropic/tests/model-meta.test.ts
+++ b/packages/typescript/ai-anthropic/tests/model-meta.test.ts
@@ -43,6 +43,30 @@ type BaseOptions = AnthropicContainerOptions &
 
 describe('Anthropic Model Provider Options Type Assertions', () => {
   describe('Models WITH extended_thinking support', () => {
+    it('claude-sonnet-4-6 should support thinking options', () => {
+      type Options =
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+
+      // Should have thinking options
+      expectTypeOf<Options>().toExtend<AnthropicThinkingOptions>()
+
+      // Should have service tier options (priority_tier support)
+      expectTypeOf<Options>().toExtend<AnthropicServiceTierOptions>()
+
+      // Should have base options
+      expectTypeOf<Options>().toExtend<BaseOptions>()
+
+      // Verify specific properties exist
+      expectTypeOf<Options>().toHaveProperty('thinking')
+      expectTypeOf<Options>().toHaveProperty('service_tier')
+      expectTypeOf<Options>().toHaveProperty('container')
+      expectTypeOf<Options>().toHaveProperty('context_management')
+      expectTypeOf<Options>().toHaveProperty('mcp_servers')
+      expectTypeOf<Options>().toHaveProperty('stop_sequences')
+      expectTypeOf<Options>().toHaveProperty('tool_choice')
+      expectTypeOf<Options>().toHaveProperty('top_k')
+    })
+
     it('claude-sonnet-4-5 should support thinking options', () => {
       type Options =
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
@@ -177,6 +201,7 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       type Keys = keyof AnthropicChatModelProviderOptionsByName
 
       expectTypeOf<'claude-opus-4-5'>().toExtend<Keys>()
+      expectTypeOf<'claude-sonnet-4-6'>().toExtend<Keys>()
       expectTypeOf<'claude-sonnet-4-5'>().toExtend<Keys>()
       expectTypeOf<'claude-haiku-4-5'>().toExtend<Keys>()
       expectTypeOf<'claude-opus-4-1'>().toExtend<Keys>()
@@ -193,6 +218,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toHaveProperty('container')
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toHaveProperty('container')
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toHaveProperty('container')
@@ -223,6 +251,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toHaveProperty('context_management')
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toHaveProperty('context_management')
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toHaveProperty('context_management')
@@ -253,6 +284,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toHaveProperty('mcp_servers')
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toHaveProperty('mcp_servers')
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toHaveProperty('mcp_servers')
@@ -283,6 +317,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toHaveProperty('stop_sequences')
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toHaveProperty('stop_sequences')
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toHaveProperty('stop_sequences')
@@ -313,6 +350,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toHaveProperty('tool_choice')
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toHaveProperty('tool_choice')
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toHaveProperty('tool_choice')
@@ -343,6 +383,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toHaveProperty('top_k')
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toHaveProperty('top_k')
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toHaveProperty('top_k')
@@ -375,6 +418,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toExtend<AnthropicThinkingOptions>()
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toExtend<AnthropicThinkingOptions>()
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toExtend<AnthropicThinkingOptions>()
@@ -408,6 +454,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toExtend<AnthropicServiceTierOptions>()
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toExtend<AnthropicServiceTierOptions>()
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toExtend<AnthropicServiceTierOptions>()
@@ -441,6 +490,9 @@ describe('Anthropic Model Provider Options Type Assertions', () => {
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
       >().toExtend<BaseOptions>()
+      expectTypeOf<
+        AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
+      >().toExtend<BaseOptions>()
       expectTypeOf<
         AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
       >().toExtend<BaseOptions>()
@@ -498,6 +550,22 @@ describe('Anthropic Model Input Modality Type Assertions', () => {
     })
   })
 
+  describe('Claude Sonnet 4.6 (text + image + document)', () => {
+    type Modalities = AnthropicModelInputModalitiesByName['claude-sonnet-4-6']
+    type Message = ConstrainedModelMessage<Modalities>
+
+    it('should allow TextPart, ImagePart, and DocumentPart', () => {
+      expectTypeOf<MessageWithContent<TextPart>>().toExtend<Message>()
+      expectTypeOf<MessageWithContent<ImagePart>>().toExtend<Message>()
+      expectTypeOf<MessageWithContent<DocumentPart>>().toExtend<Message>()
+    })
+
+    it('should NOT allow AudioPart or VideoPart', () => {
+      expectTypeOf<MessageWithContent<AudioPart>>().not.toExtend<Message>()
+      expectTypeOf<MessageWithContent<VideoPart>>().not.toExtend<Message>()
+    })
+  })
+
   describe('Claude Sonnet 4.5 (text + image + document)', () => {
     type Modalities = AnthropicModelInputModalitiesByName['claude-sonnet-4-5']
     type Message = ConstrainedModelMessage<Modalities>