feat(models): add Claude Sonnet 5 to available models (#3036)

Co-authored-by: Charles Vien <charles.v@posthog.com>

Author: richardsolomou

.github/workflows/mobile-build.yml

@@ -89,4 +89,5 @@ jobs:
     with:
       platform: all
       profile: production
-    secrets: inherit
+    secrets:
+      EXPO_TOKEN: ${{ secrets.EXPO_TOKEN }}

apps/mobile/src/features/tasks/composer/options.ts

@@ -48,6 +48,12 @@ export const MODELS: ModelOption[] = [
     description: "Most capable, slower",
     supportsReasoning: true,
   },
+  {
+    value: "claude-sonnet-5",
+    label: "Claude Sonnet 5",
+    description: "Balanced, fast",
+    supportsReasoning: true,
+  },
   {
     value: "claude-sonnet-4-6",
     label: "Claude Sonnet 4.6",

packages/agent/src/adapters/claude/session/models.test.ts

@@ -26,6 +26,10 @@ describe("toSdkModelId", () => {
     expect(toSdkModelId("claude-fable-5")).toBe("claude-fable-5");
   });
 
+  it("passes claude-sonnet-5 through unchanged (no SDK alias)", () => {
+    expect(toSdkModelId("claude-sonnet-5")).toBe("claude-sonnet-5");
+  });
+
   it("passes deprecated gateway IDs through unchanged", () => {
     expect(toSdkModelId("claude-opus-4-6")).toBe("claude-opus-4-6");
     expect(toSdkModelId("claude-sonnet-4-5")).toBe("claude-sonnet-4-5");
@@ -34,36 +38,72 @@ describe("toSdkModelId", () => {
 });
 
 describe("model capability flags", () => {
-  it("flags 1M context support", () => {
-    expect(supports1MContext("claude-opus-4-6")).toBe(false);
-    expect(supports1MContext("claude-opus-4-7")).toBe(true);
-    expect(supports1MContext("claude-sonnet-4-6")).toBe(true);
-    expect(supports1MContext("claude-haiku-4-5")).toBe(false);
-  });
-
-  it("flags effort support and xhigh-effort support", () => {
-    expect(supportsEffort("claude-opus-4-5")).toBe(false);
-    expect(supportsEffort("claude-opus-4-6")).toBe(false);
-    expect(supportsXhighEffort("claude-opus-4-7")).toBe(true);
-    expect(supportsXhighEffort("claude-opus-4-6")).toBe(false);
-    expect(supportsEffort("claude-haiku-4-5")).toBe(false);
-  });
-
-  it("flags claude-fable-5 as a flagship model", () => {
-    expect(supports1MContext("claude-fable-5")).toBe(true);
-    expect(supportsEffort("claude-fable-5")).toBe(true);
-    expect(supportsXhighEffort("claude-fable-5")).toBe(true);
-    expect(supportsMcpInjection("claude-fable-5")).toBe(true);
-  });
-
-  it("allows MCP injection for supported Claude models", () => {
-    expect(supportsMcpInjection("claude-opus-4-7")).toBe(true);
-    expect(supportsMcpInjection("claude-sonnet-4-6")).toBe(true);
-  });
-
-  it("keeps deprecated Haiku sessions excluded from MCP injection", () => {
-    expect(supportsMcpInjection("claude-haiku-4-5")).toBe(false);
-  });
+  it.each([
+    {
+      modelId: "claude-opus-4-5",
+      oneMContext: false,
+      effort: false,
+      xhighEffort: false,
+      mcpInjection: true,
+    },
+    {
+      modelId: "claude-opus-4-6",
+      oneMContext: false,
+      effort: false,
+      xhighEffort: false,
+      mcpInjection: true,
+    },
+    {
+      modelId: "claude-opus-4-7",
+      oneMContext: true,
+      effort: true,
+      xhighEffort: true,
+      mcpInjection: true,
+    },
+    {
+      modelId: "claude-opus-4-8",
+      oneMContext: true,
+      effort: true,
+      xhighEffort: true,
+      mcpInjection: true,
+    },
+    {
+      modelId: "claude-sonnet-4-6",
+      oneMContext: true,
+      effort: true,
+      xhighEffort: false,
+      mcpInjection: true,
+    },
+    {
+      modelId: "claude-sonnet-5",
+      oneMContext: true,
+      effort: true,
+      xhighEffort: true,
+      mcpInjection: true,
+    },
+    {
+      modelId: "claude-fable-5",
+      oneMContext: true,
+      effort: true,
+      xhighEffort: true,
+      mcpInjection: true,
+    },
+    {
+      modelId: "claude-haiku-4-5",
+      oneMContext: false,
+      effort: false,
+      xhighEffort: false,
+      mcpInjection: false,
+    },
+  ])(
+    "$modelId capability flags",
+    ({ modelId, oneMContext, effort, xhighEffort, mcpInjection }) => {
+      expect(supports1MContext(modelId)).toBe(oneMContext);
+      expect(supportsEffort(modelId)).toBe(effort);
+      expect(supportsXhighEffort(modelId)).toBe(xhighEffort);
+      expect(supportsMcpInjection(modelId)).toBe(mcpInjection);
+    },
+  );
 });
 
 describe("resolveEffortForModel", () => {
@@ -77,12 +117,14 @@ describe("resolveEffortForModel", () => {
     ["claude-opus-4-8", undefined, "high"],
     ["claude-opus-4-7", undefined, "high"],
     ["claude-sonnet-4-6", undefined, "high"],
+    ["claude-sonnet-5", undefined, "high"],
     // Models without effort support stay unset (SDK disables thinking).
     ["claude-haiku-4-5", undefined, undefined],
     ["claude-opus-4-6", undefined, undefined],
     // An explicit choice is always honored, including on adaptive-only models.
     ["claude-opus-4-8", "low", "low"],
     ["claude-fable-5", "max", "max"],
+    ["claude-sonnet-5", "max", "max"],
   ] as const)(
     "resolveEffortForModel(%s, %s) === %s",
     (modelId, effort, expected) => {

packages/agent/src/adapters/claude/session/models.ts

@@ -21,6 +21,7 @@ const MODELS_WITH_1M_CONTEXT = new Set([
   "claude-opus-4-7",
   "claude-opus-4-8",
   "claude-sonnet-4-6",
+  "claude-sonnet-5",
   "claude-fable-5",
 ]);
 
@@ -32,12 +33,14 @@ const MODELS_WITH_EFFORT = new Set([
   "claude-opus-4-7",
   "claude-opus-4-8",
   "claude-sonnet-4-6",
+  "claude-sonnet-5",
   "claude-fable-5",
 ]);
 
 const MODELS_WITH_XHIGH_EFFORT = new Set([
   "claude-opus-4-7",
   "claude-opus-4-8",
+  "claude-sonnet-5",
   "claude-fable-5",
 ]);
 

packages/agent/src/gateway-models.test.ts

@@ -79,6 +79,7 @@ describe("getClaudeModelRecency", () => {
     ["claude-sonnet-4-6", 4006],
     ["claude-opus-4-7", 4007],
     ["claude-opus-4-8", 4008],
+    ["claude-sonnet-5", 5000],
     ["claude-fable-5", 5000],
   ])("ranks %s by its embedded version (%i)", (modelId, rank) => {
     expect(getClaudeModelRecency(modelId)).toBe(rank);

packages/ui/src/features/message-editor/components/PromptInput.stories.tsx

@@ -24,6 +24,7 @@ const mockModelOption = {
       name: "Recommended",
       options: [
         { value: "gpt-5.5", name: "gpt-5.5" },
+        { value: "claude-sonnet-5", name: "Claude Sonnet 5" },
         { value: "claude-sonnet-4-6", name: "Claude Sonnet 4.6" },
       ],
     },