diff --git a/packages/opencode/src/project/instance.ts b/packages/opencode/src/project/instance.ts
index 98031f18d3f..f784cd99220 100644
--- a/packages/opencode/src/project/instance.ts
+++ b/packages/opencode/src/project/instance.ts
@@ -20,13 +20,14 @@ const disposal = {
 
 export const Instance = {
   async provide<R>(input: { directory: string; init?: () => Promise<any>; fn: () => R }): Promise<R> {
-    let existing = cache.get(input.directory)
+    const directory = Filesystem.canonical(input.directory)
+    let existing = cache.get(directory)
     if (!existing) {
-      Log.Default.info("creating instance", { directory: input.directory })
+      Log.Default.info("creating instance", { directory })
       existing = iife(async () => {
-        const { project, sandbox } = await Project.fromDirectory(input.directory)
+        const { project, sandbox } = await Project.fromDirectory(directory)
         const ctx = {
-          directory: input.directory,
+          directory,
           worktree: sandbox,
           project,
         }
@@ -35,7 +36,7 @@ export const Instance = {
         })
         return ctx
       })
-      cache.set(input.directory, existing)
+      cache.set(directory, existing)
     }
     const ctx = await existing
     return context.provide(ctx, async () => {
diff --git a/packages/opencode/src/util/filesystem.ts b/packages/opencode/src/util/filesystem.ts
index a87aaeb9866..160f473e7b6 100644
--- a/packages/opencode/src/util/filesystem.ts
+++ b/packages/opencode/src/util/filesystem.ts
@@ -2,7 +2,7 @@ import { chmod, mkdir, readFile, writeFile } from "fs/promises"
 import { createWriteStream, existsSync, statSync } from "fs"
 import { lookup } from "mime-types"
 import { realpathSync } from "fs"
-import { dirname, join, relative } from "path"
+import { dirname, join, normalize, relative, resolve } from "path"
 import { Readable } from "stream"
 import { pipeline } from "stream/promises"
 import { Glob } from "./glob"
@@ -113,6 +113,19 @@ export namespace Filesystem {
     }
   }
 
+  export function canonical(p: string): string {
+    const abs = normalize(resolve(p))
+    const real = (() => {
+      try {
+        return normalize(realpathSync.native(abs))
+      } catch {
+        return abs
+      }
+    })()
+    if (process.platform === "win32") return real.toLowerCase()
+    return real
+  }
+
   export function windowsPath(p: string): string {
     if (process.platform !== "win32") return p
     return (