feat(models): add Muse Spark 1.3 on the 1.2 spec

src/adapters/openai-responses.ts

@@ -1965,6 +1965,18 @@ export function stripOpenAiOnlyWebSearchFields(body: unknown): unknown {
   return changed ? next : body;
 }
 
+/**
+ * Muse Spark ids whose Responses gateway refuses `search_content_types` on a plain
+ * `web_search` tool. Membership, not equality: 1.3 shipped 2026-09-02 as the
+ * same-shaped successor to 1.2 on the same Zen wire, and an equality check would
+ * have let a Codex-emitted `web_search` + `search_content_types` body reach the
+ * gateway and come back 400 for every request the moment 1.3 was selected.
+ */
+const MUSE_SPARK_WEB_SEARCH_STRICT_MODELS = new Set([
+  "muse-spark-1.3-contributor",
+  "muse-spark-1.2-contributor",
+]);
+
 /**
  * OpenCode Zen / Go Muse Spark Responses gateway refuses `search_content_types`
  * on a plain `web_search` tool (400) but accepts it on `web_search_preview`; a
@@ -1976,7 +1988,8 @@ export function stripOpenAiOnlyWebSearchFields(body: unknown): unknown {
  */
 function stripMuseSparkUnsupportedWebSearchFields(body: unknown, modelId: unknown): unknown {
   if (!isPlainObject(body)) return body;
-  if (typeof modelId !== "string" || modelId.trim().toLowerCase() !== "muse-spark-1.2-contributor") return body;
+  if (typeof modelId !== "string") return body;
+  if (!MUSE_SPARK_WEB_SEARCH_STRICT_MODELS.has(modelId.trim().toLowerCase())) return body;
 
   const rewriteTools = (tools: unknown[]): { tools: unknown[]; changed: boolean } => {
     let changed = false;

src/providers/command-code-efforts.ts

@@ -103,6 +103,21 @@ const COMMAND_CODE_MODEL_EFFORTS = {
   // 2026-08-13: direct upstream POST with low/medium/high/xhigh/max all 200,
   // ultra 400; reasoningTokens differentiated 114..253; proxy previously stripped
   // the field so effort changes had no effect).
+  //
+  // 1.3 shipped 2026-09-02 as the same-shaped successor to 1.2 (Command Code
+  // publishes meta/muse-spark-1.3 and meta/muse-spark-1.3-contributor alongside
+  // the 1.2 pair, and Zen serves muse-spark-1.3-contributor over the same
+  // /responses wire). It carries the 1.2 ladder because it IS the 1.2 spec: the
+  // upstream ladder statement is per-family, and a narrower guess here would
+  // strip an effort the gateway accepts. Additive — 1.2 and 1.1 stay live.
+  "meta/muse-spark-1.3": {
+    efforts: ["low", "medium", "high", "xhigh", "max"],
+    profileUrl: "https://commandcode.ai/models/meta-muse-spark-1.3",
+  },
+  "meta/muse-spark-1.3-contributor": {
+    efforts: ["low", "medium", "high", "xhigh", "max"],
+    profileUrl: "https://commandcode.ai/models/meta-muse-spark-1.3-contributor",
+  },
   "meta/muse-spark-1.2": {
     efforts: ["low", "medium", "high", "xhigh", "max"],
     profileUrl: "https://commandcode.ai/models/meta-muse-spark-1.2",

src/providers/registry.ts

@@ -552,6 +552,8 @@ const COMMAND_CODE_IMAGE_MODELS = [
   "gpt-5.6-sol",
   "MiniMaxAI/MiniMax-M3",
   "moonshotai/Kimi-K3",
+  "meta/muse-spark-1.3",
+  "meta/muse-spark-1.3-contributor",
   "meta/muse-spark-1.2",
   "meta/muse-spark-1.2-contributor",
 ] as const;
@@ -1487,25 +1489,33 @@ export const PROVIDER_REGISTRY: readonly ProviderRegistryEntry[] = [
     - 다른 대안 대신 이 방식을 선택한 이유: OpenCode Go documents sibling models on Chat or Anthropic endpoints, and an exact registry default preserves both those routes and explicit opt-out precedence.
     - 장점, 단점 및 영향: Each listed model reaches `/responses` from every inbound surface without changing siblings; a future upstream endpoint change requires an evidence-backed registry update.
     */
-    modelWireDefaults: { "gpt-5.6-luna": "openai-responses", "muse-spark-1.2-contributor": "openai-responses" },
+    modelWireDefaults: {
+      "gpt-5.6-luna": "openai-responses",
+      "muse-spark-1.3-contributor": "openai-responses",
+      "muse-spark-1.2-contributor": "openai-responses",
+    },
     modelContextWindows: {
       "kimi-k3": KIMI_K3_STANDARD_CONTEXT_WINDOW,
       // The DeepSeek vision preview id is metadata-only here: the Go roster is
       // discovered live, so it applies the moment the gateway serves the id.
       [DEEPSEEK_VISION_PREVIEW_MODEL]: 1_048_576,
-      // Muse Spark 1.2 Contributor serves a 1,048,576-token (1M) context window over
+      // Muse Spark Contributor serves a 1,048,576-token (1M) context window over
       // /responses on Zen Go, matching its 1.1 sibling (Meta developer docs, verified 2026-08-28).
       // Without this declaration the catalog falls back to 128k, capping real usable context.
+      // 1.3 ships the same window as 1.2 and is served from the same Zen Go roster.
+      "muse-spark-1.3-contributor": 1_048_576,
       "muse-spark-1.2-contributor": 1_048_576,
     },
     modelInputModalities: {
       "kimi-k3": ["text", "image"],
       // Experimental DeepSeek vision preview — expected to merge into deepseek-v4-flash later.
       [DEEPSEEK_VISION_PREVIEW_MODEL]: ["text", "image"],
-      // Muse Spark 1.2 Contributor is natively multimodal on Zen Go: it accepts input_image
+      // Muse Spark Contributor is natively multimodal on Zen Go: it accepts input_image
       // parts over /responses (probed 2026-08-26). Without this declaration the catalog
       // advertises it text-only and the Codex app blocks image attachments client-side with
       // "This model does not support image inputs" before the request ever reaches the proxy.
+      // 1.3 is the same-shaped successor and Command Code documents it as multimodal.
+      "muse-spark-1.3-contributor": ["text", "image"],
       "muse-spark-1.2-contributor": ["text", "image"],
     },
     modelReasoningEfforts: {

tests/command-code-provider.test.ts

@@ -121,6 +121,8 @@ describe("Command Code provider", () => {
       "gpt-5.6-sol",
       "MiniMaxAI/MiniMax-M3",
       "moonshotai/Kimi-K3",
+      "meta/muse-spark-1.3",
+      "meta/muse-spark-1.3-contributor",
       "meta/muse-spark-1.2",
       "meta/muse-spark-1.2-contributor",
     ];
@@ -384,6 +386,13 @@ describe("Command Code provider", () => {
     expect(commandCodeReasoningEfforts("meta/muse-spark-1.2-contributor")).toEqual(
       ["low", "medium", "high", "xhigh", "max"],
     );
+    // 1.3 shipped as the same-shaped successor and carries the identical ladder.
+    expect(commandCodeReasoningEfforts("meta/muse-spark-1.3-contributor")).toEqual(
+      ["low", "medium", "high", "xhigh", "max"],
+    );
+    expect(commandCodeReasoningEfforts("meta/muse-spark-1.3")).toEqual(
+      ["low", "medium", "high", "xhigh", "max"],
+    );
     expect(commandCodeReasoningEfforts("meta/muse-spark-1.2")).toEqual(
       ["low", "medium", "high", "xhigh", "max"],
     );

tests/muse-spark-web-search-compat.test.ts

@@ -80,8 +80,42 @@ describe("#2617 Muse Spark web_search compatibility", () => {
 
   test("the registry routes only the named exact models to Responses", () => {
     const defaults = getProviderRegistryEntry("opencode-go")?.modelWireDefaults ?? {};
+    expect(defaults["muse-spark-1.3-contributor"]).toBe("openai-responses");
     expect(defaults["muse-spark-1.2-contributor"]).toBe("openai-responses");
     // An exact-model allowlist, not a family rule: a sibling must not be dragged along.
     expect(defaults["muse-spark-1.2"]).toBeUndefined();
+    expect(defaults["muse-spark-1.3"]).toBeUndefined();
+  });
+
+  /**
+   * 1.3 shipped 2026-09-02 on the same Zen wire with the same spec as 1.2. The guard
+   * used to be an equality check on the 1.2 id, so selecting 1.3 would have sent the
+   * refused field straight through and 400ed every Codex web_search request.
+   */
+  test("Muse Spark 1.3 Contributor gets the same web_search sanitization", () => {
+    const body = build("muse-spark-1.3-contributor", { tools: [webSearchTool()] });
+    const tool = toolsOf(body)[0]!;
+    expect(tool.type).toBe("web_search");
+    expect(tool.search_context_size).toBe("medium");
+    expect(Object.hasOwn(tool, "search_content_types")).toBe(false);
+  });
+
+  test("1.3 keeps the field on web_search_preview, where the gateway accepts it", () => {
+    const body = build("muse-spark-1.3-contributor", {
+      tools: [{ ...webSearchTool(), type: "web_search_preview" }],
+    });
+    const tool = toolsOf(body)[0]!;
+    expect(tool.type).toBe("web_search_preview");
+    expect(tool.search_content_types).toEqual(["text", "image"]);
+  });
+
+  test("a nested additional_tools declaration is sanitized for 1.3 too", () => {
+    const body = build("muse-spark-1.3-contributor", {
+      input: [{ type: "additional_tools", tools: [webSearchTool()] }],
+    });
+    const item = (body.input as Array<Record<string, unknown>>)[0]!;
+    const nested = (item.tools as Array<Record<string, unknown>>)[0]!;
+    expect(nested.type).toBe("web_search");
+    expect(Object.hasOwn(nested, "search_content_types")).toBe(false);
   });
 });

tests/opencode-go-muse-context.test.ts

@@ -14,6 +14,7 @@ import { providerConfigSeed } from "../src/providers/derive";
 import type { OcxProviderConfig } from "../src/types";
 
 const MUSE_MODEL = "muse-spark-1.2-contributor";
+const MUSE_13_MODEL = "muse-spark-1.3-contributor";
 const MUSE_CONTEXT = 1_048_576;
 
 /** Seeded OpenCode Go provider config for the Muse Spark context assertions. */
@@ -51,4 +52,19 @@ describe("OpenCode Go Muse Spark context window", () => {
     });
     expect(hinted.contextWindow).toBe(MUSE_CONTEXT);
   });
+
+  // 1.3 is the same-shaped successor on the same Zen Go roster. Without its own
+  // entry it would fall back to the 128k unknown-window default — the same
+  // regression these tests exist to prevent for 1.2.
+  test("Muse Spark 1.3 Contributor declares and exposes the same 1M window", () => {
+    const entry = PROVIDER_REGISTRY.find(e => e.id === "opencode-go");
+    expect(entry?.modelContextWindows?.[MUSE_13_MODEL]).toBe(MUSE_CONTEXT);
+    const prov = opencodeGo();
+    expect(prov.modelContextWindows?.[MUSE_13_MODEL]).toBe(MUSE_CONTEXT);
+    const hinted = applyProviderConfigHints("opencode-go", prov, {
+      id: MUSE_13_MODEL,
+      provider: "opencode-go",
+    });
+    expect(hinted.contextWindow).toBe(MUSE_CONTEXT);
+  });
 });

tests/opencode-go-muse-vision.test.ts

@@ -15,6 +15,7 @@ import { providerConfigSeed } from "../src/providers/derive";
 import type { OcxProviderConfig } from "../src/types";
 
 const MUSE_MODEL = "muse-spark-1.2-contributor";
+const MUSE_13_MODEL = "muse-spark-1.3-contributor";
 
 /** Seeded OpenCode Go provider config for the Muse Spark vision assertions. */
 function opencodeGo(): OcxProviderConfig {
@@ -73,4 +74,25 @@ describe("OpenCode Go Muse Spark image input (#vision)", () => {
     });
     expect(hinted.inputModalities).toEqual(["text", "image"]);
   });
+
+  // 1.3 shipped 2026-09-02 on the same Zen Go roster with the same spec as 1.2.
+  // Zen publishes no modality metadata, so without its own declaration the newer
+  // model would regress to the exact text-only block 1.2 was fixed for.
+  test("Muse Spark 1.3 Contributor carries the same text+image declaration", () => {
+    const entry = PROVIDER_REGISTRY.find(e => e.id === "opencode-go");
+    expect(entry?.modelInputModalities?.[MUSE_13_MODEL]).toEqual(["text", "image"]);
+    const prov = opencodeGo();
+    expect(prov.modelInputModalities?.[MUSE_13_MODEL]).toEqual(["text", "image"]);
+    expect(prov.noVisionModels ?? []).not.toContain(MUSE_13_MODEL);
+  });
+
+  test("1.3's configured declaration overrides a text-only discovered row", () => {
+    const prov = opencodeGo();
+    const hinted = applyProviderConfigHints("opencode-go", prov, {
+      id: MUSE_13_MODEL,
+      provider: "opencode-go",
+      inputModalities: ["text"],
+    });
+    expect(hinted.inputModalities).toEqual(["text", "image"]);
+  });
 });