feat(anthropic): inherit context window for numeric variants

src/codex/catalog/provider-fetch.ts

@@ -625,8 +625,32 @@ export function clearGatherRoutedModelsInflight(): void {
   gatherInflight.clear();
 }
 
+const NUMERIC_MODEL_ID_SEGMENT = /^\d+$/;
+
+/**
+ * Resolve an unknown Claude point release or date pin from the nearest configured
+ * family row. Only numeric tail segments are removed so unrelated model families
+ * cannot inherit one another's limits.
+ */
+function anthropicFamilyContextWindow(
+  record: Record<string, number> | undefined,
+  id: string,
+): number | undefined {
+  if (!record || !id.startsWith("claude-")) return undefined;
+  let candidate = id;
+  while (true) {
+    const cut = candidate.lastIndexOf("-");
+    if (cut <= 0 || !NUMERIC_MODEL_ID_SEGMENT.test(candidate.slice(cut + 1))) return undefined;
+    candidate = candidate.slice(0, cut);
+    const value = modelRecordValue(record, candidate);
+    if (typeof value === "number" && value > 0) return value;
+  }
+}
+
 export function configuredContextWindow(prov: OcxProviderConfig, id: string): number | undefined {
-  const configured = modelRecordValue(prov.modelContextWindows, id) ?? prov.contextWindow;
+  const configured = modelRecordValue(prov.modelContextWindows, id)
+    ?? (prov.adapter === "anthropic" ? anthropicFamilyContextWindow(prov.modelContextWindows, id) : undefined)
+    ?? prov.contextWindow;
   return typeof configured === "number" && configured > 0 ? configured : undefined;
 }
 

tests/provider-registry-parity.test.ts

@@ -827,6 +827,34 @@ describe("provider registry parity", () => {
     }
   });
 
+  test("unknown Claude numeric variants inherit the nearest configured family context window", () => {
+    const anthropic = PROVIDER_REGISTRY.find(entry => entry.id === "anthropic");
+    const seed = providerConfigSeed(anthropic!);
+    const contextWindow = (id: string) => applyProviderConfigHints("anthropic", seed, {
+      id,
+      provider: "anthropic",
+    }).contextWindow;
+
+    expect(contextWindow("claude-fable-5-2")).toBe(1_000_000);
+    expect(contextWindow("claude-haiku-4-5-20251001")).toBe(200_000);
+    expect(contextWindow("claude-opus-4-1-20250805")).toBeUndefined();
+    expect(contextWindow("claude-3-7-sonnet-20250219")).toBeUndefined();
+  });
+
+  test("context-window family inheritance stays scoped to the Anthropic adapter", () => {
+    const minimax = PROVIDER_REGISTRY.find(entry => entry.id === "minimax");
+    const seed = {
+      ...providerConfigSeed(minimax!),
+      modelContextWindows: { "MiniMax-M3": 204_800 },
+    };
+    const model = applyProviderConfigHints("minimax", seed, {
+      id: "MiniMax-M3-1",
+      provider: "minimax",
+    });
+
+    expect(model.contextWindow).toBeUndefined();
+  });
+
   test("GUI preset projection preserves current featured set plus key catalog and custom", () => {
     const featured = deriveFeaturedProviderIds();
     expect(featured).toEqual([