fix: match OpenRouter model ids in the gateway model listing (#1365)

The model picker was empty behind OpenRouter: `normalizeModelId` did not
match `anthropic/claude-opus-5.5:batch[1m]` to `claude-opus-5-5`. It now
strips a leading `anthropic/` and a `:variant` suffix, and maps `5.5` to
`5-5`.

src/session-model.ts

@@ -264,25 +264,40 @@ function resolveSettingsModel(
 const MODEL_FAMILY_ALIASES = new Set(["opus", "sonnet", "haiku", "fable"]);
 
 /** A model id without the spellings that name the same model: provider
- *  prefixes, dates, version suffixes, `-fast` and context hints. `deniedModels`
+ *  prefixes, dates, version suffixes, `:variant` suffixes, dotted versions,
- *  and gateway listings both match on it. */
+ *  `-fast` and context hints. `deniedModels` and gateway listings both match on
+ *  it. OpenRouter lists `anthropic/claude-opus-5.5:batch[1m]`, which normalizes
+ *  to `claude-opus-5-5`; `anthropic/openai/gpt-5` keeps its `openai/` prefix and
+ *  matches no Claude id. */
 function normalizeModelId(value: string): string {
   let id = stripContextHints(value.trim().toLowerCase());
   const providerPrefix = id.lastIndexOf("anthropic.");
   if (providerPrefix !== -1) id = id.slice(providerPrefix + "anthropic.".length);
-  return id
+  return (
+    id
+      // Only a leading `anthropic/`: OpenRouter's `anthropic/openai/gpt-5` must
+      // keep `openai/`, which `lastIndexOf` would strip along with it.
+      .replace(/^anthropic\//, "")
+      // `:batch`, `:free`. A letter must follow the colon, so Bedrock's `-v1:0`
+      // is left for the `-vN:M` step below.
+      .replace(/:[a-z][a-z0-9-]*$/, "")
+      // `claude-opus-5.5` -> `claude-opus-5-5`; only dots between two digits.
+      .replace(/(?<=\d)\.(?=\d)/g, "-")
       .replace(/@.*$/, "")
       .replace(/-v\d+(?::\d+)?$/, "")
       .replace(/-fast$/, "")
-    .replace(/-\d{8}$/, "");
+      .replace(/-\d{8}$/, "")
+  );
 }
 
 /**
  * Whether managed `deniedModels` blocks a model id, following the CLI's rules
  * closely enough for the picker: a family alias blocks the whole family, and a
  * model id blocks that version in every spelling plus the later minor versions
- * it prefixes (`claude-opus-5` also blocks `claude-opus-5-5`). The CLI stays
+ * it prefixes (`claude-opus-5` also blocks `claude-opus-5-5`). Entries share
- * the enforcer; this only keeps the picker from offering a refused row.
+ * `normalizeModelId`, so `claude-opus-4.5` or `anthropic/claude-opus-4.5` also
+ * blocks `claude-opus-4-5`, which the CLI may still allow. The CLI stays the
+ * enforcer; this only keeps the picker from offering a refused row.
  */
 export function isDeniedModel(modelId: string, deniedModels: readonly string[]): boolean {
   const id = normalizeModelId(modelId);

src/tests/gateway-models.test.ts

@@ -280,9 +280,46 @@ describe("narrowToGatewayModels", () => {
     expect(narrowed.map((m) => m.value)).toEqual(["sonnet"]);
   });
 
+  it("matches OpenRouter ids: vendor prefix, dotted version and :variant suffix", () => {
+    const models: ModelInfo[] = [
+      {
+        value: "default",
+        resolvedModel: "claude-opus-5-5[1m]",
+        displayName: "Default",
+        description: "",
+      },
+      { value: "opus", displayName: "Opus", description: "" },
+      {
+        value: "sonnet",
+        resolvedModel: "claude-sonnet-5-5",
+        displayName: "Sonnet",
+        description: "",
+      },
+      { value: "haiku", resolvedModel: "claude-haiku-4-5", displayName: "Haiku", description: "" },
+      { value: "fable", resolvedModel: "claude-fable-5-1", displayName: "Fable", description: "" },
+    ];
+
+    const narrowed = narrowToGatewayModels(models, [
+      "anthropic/claude-opus-5.5:batch[1m]",
+      "anthropic/claude-opus-5.5[1m]",
+      "anthropic/claude-sonnet-5.5[1m]",
+      "anthropic/openai/gpt-6.1-sol:batch[1m]",
+      "anthropic/google/gemini-4-argon[1m]",
+    ]);
+
+    expect(narrowed.map((m) => m.value)).toEqual(["default", "opus", "sonnet"]);
+  });
+
+  it("matches a model OpenRouter lists only as a :variant", () => {
+    const narrowed = narrowToGatewayModels(MODELS, ["anthropic/claude-sonnet-5:batch[1m]"]);
+
+    expect(narrowed.map((m) => m.value)).toEqual(["sonnet", "sonnet[1m]"]);
+  });
+
   it("leaves no model when the listing matches none", () => {
     expect(narrowToGatewayModels(MODELS, ["gpt-5", "gemini-3-pro"])).toEqual([]);
     expect(narrowToGatewayModels(MODELS, [])).toEqual([]);
+    expect(narrowToGatewayModels(MODELS, ["anthropic/openai/gpt-5"])).toEqual([]);
     // A default row without resolvedModel is not a match on its own.
     expect(
       narrowToGatewayModels(

src/tests/model-resolution.test.ts

@@ -263,6 +263,14 @@ describe("isDeniedModel", () => {
     expect(isDeniedModel("us.anthropic.claude-opus-5-v1:0", denied)).toBe(true);
     expect(isDeniedModel("claude-opus-5-5", denied)).toBe(true);
     expect(isDeniedModel("claude-opus-4-8", denied)).toBe(false);
+    expect(isDeniedModel("anthropic/claude-opus-5.5:batch[1m]", denied)).toBe(true);
+    expect(isDeniedModel("anthropic/us.anthropic.claude-opus-5-v1:0", denied)).toBe(true);
+  });
+
+  it("reads an entry in OpenRouter or dotted spelling as the dashed SDK id", () => {
+    expect(isDeniedModel("claude-opus-4-5", ["claude-opus-4.5"])).toBe(true);
+    expect(isDeniedModel("claude-opus-5-5", ["anthropic/claude-opus-5.5"])).toBe(true);
+    expect(isDeniedModel("claude-opus-5", ["anthropic/claude-opus-5.5"])).toBe(false);
   });
 
   it("blocks only that version when the entry names a minor", () => {