feat(models): add Claude Fable 5.1

changelog.d/features/12366-claude-fable-5-1.md

@@ -0,0 +1,2 @@
+- **feat(models):** add Claude Fable 5.1 (`claude-fable-5-1`) to the anthropic, claude, claude-web, and vertex registries with capability specs, Bedrock aliases, 1M-context beta eligibility, family fallback, and pricing — including its lower $0.25/MTok cache-read price ([#12366](https://github.com/diegosouzapw/OmniRoute/pull/12366)) — thanks @davidebaraldo
+- **fix(claude):** bump spoofed Claude Code client version to 2.1.258 so Anthropic accepts Fable 5.1 on OAuth connections ([#12366](https://github.com/diegosouzapw/OmniRoute/pull/12366)) — thanks @davidebaraldo

open-sse/config/context1m.ts

@@ -13,6 +13,7 @@
  * without importing each other.
  */
 export const CONTEXT_1M_SUPPORTED_MODELS = [
+  "claude-fable-5-1",
   "claude-fable-5",
   "claude-sonnet-5",
   "claude-sonnet-4-6",
@@ -36,4 +37,4 @@ export function modelSupportsContext1mBeta(model: string | null | undefined): bo
   return CONTEXT_1M_SUPPORTED_MODELS.some(
     (supported) => normalizedModel === supported || normalizedModel.startsWith(`${supported}-`)
   );
-}
+}

open-sse/config/providers/registry/anthropic/index.ts

@@ -16,6 +16,15 @@ export const anthropicProvider: RegistryEntry = {
     "Anthropic-Beta": ANTHROPIC_BETA_API_KEY,
   },
   models: [
+    {
+      id: "claude-fable-5-1",
+      name: "Claude Fable 5.1",
+      contextLength: 1048576,
+      maxOutputTokens: 128000,
+      // Fable 5.1 (2026-09-01) keeps Fable 5's request surface: adaptive-only thinking,
+      // non-default temperature/top_p/top_k rejected with a 400.
+      unsupportedParams: ["temperature", "top_p", "top_k"],
+    },
     {
       id: "claude-fable-5",
       name: "Claude Fable 5",

open-sse/config/providers/registry/claude/index.ts

@@ -28,6 +28,13 @@ export const claudeProvider: RegistryEntry = {
     tokenUrl: "https://api.anthropic.com/v1/oauth/token",
   },
   models: [
+    {
+      id: "claude-fable-5-1",
+      name: "Claude Fable 5.1",
+      contextLength: 1000000,
+      maxOutputTokens: 128000,
+      unsupportedParams: ["temperature", "top_p", "top_k"],
+    },
     {
       id: "claude-fable-5",
       name: "Claude Fable 5",

open-sse/config/providers/registry/claude/web/index.ts

@@ -9,6 +9,7 @@ export const claude_webProvider: RegistryEntry = {
   authType: "apikey",
   authHeader: "cookie",
   models: [
+    { id: "claude-fable-5-1", name: "Claude Fable 5.1 (web)", toolCalling: false },
     { id: "claude-fable-5", name: "Claude Fable 5 (web)", toolCalling: false },
     {
       id: "claude-opus-5",

open-sse/config/providers/registry/vertex/index.ts

@@ -27,6 +27,7 @@ export const vertexProvider: RegistryEntry = {
     { id: "DeepSeek-V4-Pro", name: "DeepSeek V4 Pro (Vertex Partner)" },
     { id: "Qwen3.6-35B-A3B", name: "Qwen3.6 35B A3B (Vertex Partner)" },
     { id: "GLM-5.1-FP8", name: "GLM-5.1 (Vertex Partner)" },
+    { id: "claude-fable-5-1", name: "Claude Fable 5.1 (Vertex)", targetFormat: "claude" },
     { id: "claude-fable-5", name: "Claude Fable 5 (Vertex)", targetFormat: "claude" },
     { id: "claude-opus-5", name: "Claude Opus 5 (Vertex)", targetFormat: "claude" },
     { id: "claude-sonnet-5", name: "Claude Sonnet 5 (Vertex)", targetFormat: "claude" },

open-sse/services/modelFamilyFallback.ts

@@ -78,8 +78,9 @@ const FAMILY_FALLBACK_TEMPLATES: Record<string, readonly string[]> = {
   "gemini-2.5-pro": ["gemini-2.5-pro-preview-06-05", "gemini-2.5-pro-exp-03-25"],
   "gemini-2.5-pro-preview-06-05": ["gemini-2.5-pro", "gemini-2.5-pro-exp-03-25"],
 
-  // Claude Mythos family (Fable 5) — flagship falls to the next-best Opus
+  // Claude Mythos family (Fable 5.1/5) — flagship falls to the next-best Opus
   // tiers before the cheaper Sonnet, matching the Opus family ordering.
+  "claude-fable-5-1": ["claude-fable-5", "claude-opus-5", "claude-sonnet-5"],
   "claude-fable-5": ["claude-opus-4-8", "claude-opus-4-7", "claude-sonnet-5"],
 
   // Claude Opus family

open-sse/services/providerCostData.ts

@@ -11,6 +11,7 @@ export interface ModelPricing {
 export const KNOWN_MODEL_PRICING: Record<string, ModelPricing> = {
   "gpt-4o": { inputCostPer1M: 2.5, outputCostPer1M: 10.0, isFree: false },
   "gpt-4o-mini": { inputCostPer1M: 0.15, outputCostPer1M: 0.6, isFree: false },
+  "claude-fable-5-1": { inputCostPer1M: 10.0, outputCostPer1M: 50.0, isFree: false },
   "claude-fable-5": { inputCostPer1M: 15.0, outputCostPer1M: 75.0, isFree: false },
   "claude-opus-5": { inputCostPer1M: 5.0, outputCostPer1M: 25.0, isFree: false },
   "claude-opus-4-8": { inputCostPer1M: 15.0, outputCostPer1M: 75.0, isFree: false },

src/lib/providers/staticModels.ts

@@ -35,6 +35,7 @@ const STATIC_MODEL_PROVIDERS: Record<string, () => Array<{ id: string; name: str
   ],
   antigravity: () => ANTIGRAVITY_PUBLIC_MODELS.map((model) => ({ ...model })),
   claude: () => [
+    { id: "claude-fable-5-1", name: "Claude Fable 5.1" },
     { id: "claude-fable-5", name: "Claude Fable 5" },
     { id: "claude-opus-5", name: "Claude Opus 5" },
     { id: "claude-opus-4-8", name: "Claude Opus 4.8" },

src/shared/constants/claudeCodeClient.ts

@@ -4,7 +4,7 @@
  * Keep this leaf dependency-free so server executors, compatibility bridges,
  * and client-facing identity presets can share one source of truth.
  */
-export const CLAUDE_CODE_CLIENT_VERSION = "2.1.220";
+export const CLAUDE_CODE_CLIENT_VERSION = "2.1.258";
 export const CLAUDE_CODE_CLIENT_BUILD_REVISION = "1f2";
 export const CLAUDE_CODE_CLIENT_BILLING_VERSION = `${CLAUDE_CODE_CLIENT_VERSION}.${CLAUDE_CODE_CLIENT_BUILD_REVISION}`;
 export const CLAUDE_CODE_SDK_PACKAGE_VERSION = "0.94.0";

src/shared/constants/modelSpecs.ts

@@ -371,6 +371,22 @@ export const MODEL_SPECS: Record<string, ModelSpec> = {
     aliases: BEDROCK_CLAUDE_ALIASES("claude-opus-4-7", "claude-opus-4.7"),
   },
 
+  // ── Claude Fable 5.1 ────────────────────────────────────────────
+  // Same request surface as Claude Fable 5 (adaptive-only, thinking cannot be
+  // disabled); released 2026-09-01 with cache reads at a quarter of Fable 5's price.
+  "claude-fable-5-1": {
+    maxOutputTokens: 128000,
+    contextWindow: 1000000,
+    defaultThinkingBudget: 32000,
+    thinkingBudgetCap: 120000,
+    supportsThinking: true,
+    supportsTools: true,
+    supportsVision: true,
+    rejectsThinkingDisabled: true,
+    adaptiveThinkingOnly: true,
+    aliases: BEDROCK_CLAUDE_ALIASES("claude-fable-5-1"),
+  },
+
   // ── Claude Fable 5 ──────────────────────────────────────────────
   "claude-fable-5": {
     maxOutputTokens: 128000,

src/shared/constants/pricing/frontier-labs.ts

@@ -8,6 +8,7 @@ import {
   GPT_5_6_LUNA_PRICING,
   GPT_5_6_SOL_PRICING,
   GPT_5_6_TERRA_PRICING,
+  CLAUDE_FABLE_5_1_PRICING,
   CLAUDE_FABLE_5_PRICING,
   CLAUDE_OPUS_5_PRICING,
   CLAUDE_OPUS_4_PRICING,
@@ -213,6 +214,7 @@ export const DEFAULT_PRICING_FRONTIER = {
     // Common model IDs (without dates) used across providers
     // Intentional duplicates of dot-notation variants (e.g. claude-opus-4.6)
     // to cover hyphen-notation IDs (claude-opus-4-6) used by some clients
+    "claude-fable-5-1": CLAUDE_FABLE_5_1_PRICING,
     "claude-fable-5": CLAUDE_FABLE_5_PRICING,
     "claude-opus-5": CLAUDE_OPUS_5_PRICING,
     "claude-sonnet-5": CLAUDE_SONNET_5_PRICING,

src/shared/constants/pricing/oauth-subscriptions.ts

@@ -20,6 +20,13 @@ const ANTIGRAVITY_GEMINI_3_7_PRICING = {
 
 export const DEFAULT_PRICING_OAUTH = {
   cc: {
+    "claude-fable-5-1": {
+      input: 10.0,
+      output: 50.0,
+      cached: 0.25,
+      reasoning: 50.0,
+      cache_creation: 12.5,
+    },
     "claude-fable-5": {
       input: 10.0,
       output: 50.0,

src/shared/constants/pricing/shared-tiers.ts

@@ -52,6 +52,16 @@ export const GEMINI_3_7_FLASH_PROMO_PRICING = {
   cache_creation: 0.75,
 };
 
+// Claude Fable 5.1 (2026-09-01): same list price as Fable 5's official $10/$50 tier,
+// with cache reads dropped to $0.25/MTok (a quarter of Fable 5's read price).
+export const CLAUDE_FABLE_5_1_PRICING = {
+  input: 10.0,
+  output: 50.0,
+  cached: 0.25,
+  reasoning: 50.0,
+  cache_creation: 12.5,
+};
+
 export const CLAUDE_FABLE_5_PRICING = {
   input: 15.0,
   output: 75.0,

tests/snapshots/provider/translate-path.json

@@ -28,7 +28,7 @@
       "apiKey": {
         "Accept": "text/event-stream",
         "Content-Type": "application/json",
-        "User-Agent": "claude-cli/2.1.220 (external, sdk-cli)",
+        "User-Agent": "claude-cli/2.1.258 (external, sdk-cli)",
         "X-Stainless-Arch": "<ARCH>",
         "X-Stainless-Lang": "js",
         "X-Stainless-OS": "MacOS",
@@ -47,7 +47,7 @@
       "nonStream": {
         "Accept": "application/json",
         "Content-Type": "application/json",
-        "User-Agent": "claude-cli/2.1.220 (external, sdk-cli)",
+        "User-Agent": "claude-cli/2.1.258 (external, sdk-cli)",
         "X-Stainless-Arch": "<ARCH>",
         "X-Stainless-Lang": "js",
         "X-Stainless-OS": "MacOS",
@@ -66,7 +66,7 @@
       "oauth": {
         "Accept": "text/event-stream",
         "Content-Type": "application/json",
-        "User-Agent": "claude-cli/2.1.220 (external, sdk-cli)",
+        "User-Agent": "claude-cli/2.1.258 (external, sdk-cli)",
         "X-Stainless-Arch": "<ARCH>",
         "X-Stainless-Lang": "js",
         "X-Stainless-OS": "MacOS",
@@ -966,7 +966,7 @@
         "Anthropic-Dangerous-Direct-Browser-Access": "true",
         "Anthropic-Version": "2023-06-01",
         "Content-Type": "application/json",
-        "User-Agent": "claude-cli/2.1.220 (external, cli)",
+        "User-Agent": "claude-cli/2.1.258 (external, cli)",
         "X-App": "cli",
         "X-Stainless-Arch": "<ARCH>",
         "X-Stainless-Helper-Method": "stream",
@@ -984,7 +984,7 @@
         "Anthropic-Dangerous-Direct-Browser-Access": "true",
         "Anthropic-Version": "2023-06-01",
         "Content-Type": "application/json",
-        "User-Agent": "claude-cli/2.1.220 (external, cli)",
+        "User-Agent": "claude-cli/2.1.258 (external, cli)",
         "X-App": "cli",
         "X-Stainless-Arch": "<ARCH>",
         "X-Stainless-Helper-Method": "stream",
@@ -1003,7 +1003,7 @@
         "Anthropic-Dangerous-Direct-Browser-Access": "true",
         "Anthropic-Version": "2023-06-01",
         "Content-Type": "application/json",
-        "User-Agent": "claude-cli/2.1.220 (external, cli)",
+        "User-Agent": "claude-cli/2.1.258 (external, cli)",
         "X-App": "cli",
         "X-Stainless-Arch": "<ARCH>",
         "X-Stainless-Helper-Method": "stream",

tests/unit/anthropic-cache-fingerprint.test.ts

@@ -5,6 +5,6 @@ import { CLAUDE_CODE_CLIENT_BILLING_VERSION } from "../../src/shared/constants/c
 
 describe("Anthropic billing header fingerprint (#1638)", () => {
   it("uses the immutable build revision captured from the signed CLI", () => {
-    assert.equal(CLAUDE_CODE_CLIENT_BILLING_VERSION, "2.1.220.1f2");
+    assert.equal(CLAUDE_CODE_CLIENT_BILLING_VERSION, "2.1.258.1f2");
   });
 });

tests/unit/cc-bridge-transforms.test.ts

@@ -52,7 +52,11 @@ test("DEFAULT_CC_BRIDGE_PIPELINE places billing header at [0] and identity at [1
     DEFAULT_CC_BRIDGE_PIPELINE
   );
   const blocks = result.body.system as any[];
-  assert.ok(blocks[0].text.startsWith("x-anthropic-billing-header: cc_version=2.1.220.1f2;"));
+  assert.ok(
+    blocks[0].text.startsWith(
+      `x-anthropic-billing-header: cc_version=${DEFAULT_CLAUDE_CODE_VERSION}.1f2;`
+    )
+  );
   assert.equal(blocks[1].text, CLAUDE_AGENT_SDK_IDENTITY);
 });
 

tests/unit/claude-codex-identity-version-sync.test.ts

@@ -38,10 +38,10 @@ test("Claude CLI version constants are in lockstep across all 4 sources", () =>
   );
 });
 
-test("Claude CLI wire versions match the captured 2.1.220 binary", () => {
-  assert.equal(canonical.CLAUDE_CODE_CLIENT_VERSION, "2.1.220");
+test("Claude CLI wire versions match the captured 2.1.258 binary", () => {
+  assert.equal(canonical.CLAUDE_CODE_CLIENT_VERSION, "2.1.258");
   assert.equal(canonical.CLAUDE_CODE_CLIENT_BUILD_REVISION, "1f2");
-  assert.equal(canonical.CLAUDE_CODE_CLIENT_BILLING_VERSION, "2.1.220.1f2");
+  assert.equal(canonical.CLAUDE_CODE_CLIENT_BILLING_VERSION, "2.1.258.1f2");
   assert.equal(canonical.CLAUDE_CODE_SDK_PACKAGE_VERSION, "0.94.0");
   assert.equal(canonical.CLAUDE_CODE_RUNTIME_VERSION, "v26.3.0");
   assert.equal(

tests/unit/claude-web-sonnet5-registry-6209.test.ts

@@ -9,6 +9,7 @@ test("claude-web registry matches the current selectable model set", () => {
   assert.deepEqual(
     ids,
     [
+      "claude-fable-5-1",
       "claude-fable-5",
       "claude-haiku-4-5-20251001",
       "claude-opus-5",

tests/unit/client-identity-profiles.test.ts

@@ -17,6 +17,7 @@ const {
   getClientIdentityProfileHeaders,
   isClientIdentityProfileId,
 } = await import("../../src/shared/constants/clientIdentityProfiles.ts");
+const { getClaudeCodeUserAgent } = await import("../../src/shared/constants/claudeCodeClient.ts");
 const { isForbiddenCustomHeaderName } =
   await import("../../src/shared/constants/upstreamHeaders.ts");
 const { DefaultExecutor } = await import("../../open-sse/executors/default.ts");
@@ -39,7 +40,7 @@ test("getClientIdentityProfileHeaders: unknown profile id falls back to no heade
 
 test("getClientIdentityProfileHeaders: known CLI profiles expose their preset headers", () => {
   const claudeCli = getClientIdentityProfileHeaders("claude-cli");
-  assert.equal(claudeCli["User-Agent"], "claude-cli/2.1.220 (external, cli)");
+  assert.equal(claudeCli["User-Agent"], getClaudeCodeUserAgent("cli"));
   assert.equal(claudeCli["X-App"], "cli");
 
   const codexCli = getClientIdentityProfileHeaders("codex-cli");
@@ -55,7 +56,7 @@ test("getClientIdentityProfileHeaders: returns a fresh mutable copy (catalog sta
   headers["User-Agent"] = "tampered";
   assert.equal(
     CLIENT_IDENTITY_PROFILES["claude-cli"].headers["User-Agent"],
-    "claude-cli/2.1.220 (external, cli)"
+    getClaudeCodeUserAgent("cli")
   );
 });
 
@@ -100,7 +101,7 @@ test("profile headers merged into customHeaders survive applyCustomHeaders sanit
     true
   ) as Record<string, string>;
 
-  assert.equal(headers["User-Agent"], "claude-cli/2.1.220 (external, cli)");
+  assert.equal(headers["User-Agent"], getClaudeCodeUserAgent("cli"));
   assert.equal(headers["X-App"], "cli");
   assert.equal(headers["Authorization"], "Bearer test-key");
 });

tests/unit/executor-default-base.test.ts

@@ -1576,7 +1576,7 @@ test("DefaultExecutor.execute does not produce duplicate anthropic-version heade
   const sentBody = JSON.parse(capturedBody) as { system?: Array<{ text?: string }> };
   assert.match(
     sentBody.system?.[0]?.text ?? "",
-    /^x-anthropic-billing-header: cc_version=2\.1\.220\.1f2; cc_entrypoint=cli; cch=[0-9a-f]{5};$/
+    /^x-anthropic-billing-header: cc_version=2\.1\.258\.1f2; cc_entrypoint=cli; cch=[0-9a-f]{5};$/
   );
 });
 

tests/unit/glm-executor.test.ts

@@ -3,6 +3,7 @@ import assert from "node:assert/strict";
 
 import { getExecutor } from "../../open-sse/executors/index.ts";
 import { GlmExecutor } from "../../open-sse/executors/glm.ts";
+import { CLAUDE_CODE_CLIENT_VERSION } from "../../src/shared/constants/claudeCodeClient.ts";
 
 function makeSseResponse(lines: string[]): Response {
   return new Response(lines.join("\n\n") + "\n\n", {
@@ -130,9 +131,9 @@ test("GlmExecutor normalizes GLM coding and Anthropic URLs without duplicating e
 });
 
 test("GlmExecutor separates OpenAI-compatible coding headers from Anthropic headers", async () => {
-  assert.equal(await getExecutor("glm") instanceof GlmExecutor, true);
-  assert.equal(await getExecutor("glm-cn") instanceof GlmExecutor, true);
-  assert.equal(await getExecutor("glmt") instanceof GlmExecutor, true);
+  assert.equal((await getExecutor("glm")) instanceof GlmExecutor, true);
+  assert.equal((await getExecutor("glm-cn")) instanceof GlmExecutor, true);
+  assert.equal((await getExecutor("glmt")) instanceof GlmExecutor, true);
 
   const executor = new GlmExecutor("glm");
   const codingHeaders = executor.buildHeaders(
@@ -183,7 +184,10 @@ test("GlmExecutor separates OpenAI-compatible coding headers from Anthropic head
   assert.equal(anthropicHeaders["anthropic-version"], "2023-06-01");
   assert.match(anthropicHeaders["anthropic-beta"], /claude-code-20250219/);
   assert.equal(anthropicHeaders["anthropic-dangerous-direct-browser-access"], "true");
-  assert.match(anthropicHeaders["User-Agent"], /^claude-cli\/2\.1\.220 \(external, sdk-cli\)$/);
+  assert.equal(
+    anthropicHeaders["User-Agent"],
+    `claude-cli/${CLAUDE_CODE_CLIENT_VERSION} (external, sdk-cli)`
+  );
   assert.equal(anthropicHeaders["X-Stainless-Lang"], "js");
   assert.equal(anthropicHeaders["X-Stainless-Runtime"], "node");
 });

tests/unit/provider-models-config.test.ts

@@ -142,10 +142,19 @@ test("GitHub Copilot registry reflects the current supported model lineup", () =
 });
 
 test("Claude flagship catalogs keep Fable 5 first", () => {
-  for (const provider of ["anthropic", "cc", "cw", "gh", "ghe-copilot"]) {
+  // Anthropic-native catalogs list Fable 5.1 first (2026-09-01). Copilot's
+  // public model list has not shipped 5.1 yet, so gh/ghe still flagship Fable 5.
+  const expectedFirst = {
+    anthropic: "claude-fable-5-1",
+    cc: "claude-fable-5-1",
+    cw: "claude-fable-5-1",
+    gh: "claude-fable-5",
+    "ghe-copilot": "claude-fable-5",
+  };
+  for (const [provider, expected] of Object.entries(expectedFirst)) {
     assert.equal(
       getProviderModels(provider)[0]?.id,
-      "claude-fable-5",
+      expected,
       `${provider} must list the strongest Claude model first`
     );
   }