[WRONG BRANCH] Align vision sidecar runtime default to gpt-5.6-luna

src/vision/index.ts

@@ -13,7 +13,7 @@ import type { TranslatorBudget } from "../lib/translator-budget";
 export { describeImage } from "./describe";
 export { describeImageAnthropic, parseAnthropicVisionSSE } from "./anthropic-describe";
 
-const DEFAULT_VISION_MODEL = "gpt-5.4-mini";
+const DEFAULT_VISION_MODEL = "gpt-5.6-luna";
 const DEFAULT_ANTHROPIC_VISION_MODEL = "claude-sonnet-5";
 const DEFAULT_TIMEOUT_MS = 45_000;
 const DEFAULT_MAX_DESCRIPTIONS_PER_TURN = 8;

structure/04_transports-and-sidecars.md

@@ -588,7 +588,7 @@ sidecar authority exists. Both have two possible backends, but they select diffe
 | Sidecar | Backend selection | Default model | Activation |
 | --- | --- | --- | --- |
 | `web-search/` | Explicit configuration only: unset always resolves to the OpenAI forward path. Anthropic is never auto-selected from credential availability — doing so once sent OpenAI model ids to the Anthropic API. | `gpt-5.6-luna` (OpenAI), `claude-sonnet-5` (Anthropic) | Hosted `web_search` requested by a non-passthrough routed model. |
-| `vision/` | Explicit configuration wins for both backends. Only an unset backend auto-selects: Anthropic when a usable Anthropic OAuth provider exists, otherwise the OpenAI forward authority. An explicitly selected backend whose authority is unavailable produces no plan rather than falling back. | `claude-sonnet-5` (Anthropic), `gpt-5.4-mini` (OpenAI) | Input contains images for a model listed in `noVisionModels`. |
+| `vision/` | Explicit configuration wins for both backends. Only an unset backend auto-selects: Anthropic when a usable Anthropic OAuth provider exists, otherwise the OpenAI forward authority. An explicitly selected backend whose authority is unavailable produces no plan rather than falling back. | `claude-sonnet-5` (Anthropic), `gpt-5.6-luna` (OpenAI) | Input contains images for a model listed in `noVisionModels`. |
 
 The asymmetry is in the unset case only: vision may describe an image with whichever model can see
 it, while a hosted search tool is tied to a provider-specific tool contract, so search never infers

tests/claude-sidecar-override.test.ts

@@ -124,3 +124,17 @@ test("unset Claude overrides inherit the global sidecar backend and model", () =
     settings: { model: "global-vision" },
   });
 });
+
+test("unset OpenAI vision model uses the operator-visible default", () => {
+  const config: OcxConfig = {
+    port: 10100,
+    defaultProvider: "routed",
+    providers: { routed, forward },
+    visionSidecar: { backend: "openai" },
+  };
+
+  expect(planVisionSidecar(config, routed, "text-model", request, openAiSidecar)).toMatchObject({
+    backend: "openai",
+    settings: { model: "gpt-5.6-luna" },
+  });
+});