fix(providers): correct Codex GPT-5.6 context limits (#9432)

Merge-train validated (tip 6ce4effef8). Vitest failures confirmed as base-red (#9679).

changelog.d/fixes/9431-codex-gpt56-context.md

@@ -0,0 +1 @@
+- **fix(providers):** Codex GPT-5.6 model metadata reports the 1M context window and 922K input limit ([#9431](https://github.com/diegosouzapw/OmniRoute/issues/9431)).

open-sse/config/providers/shared.ts

@@ -271,16 +271,14 @@ export const GPT_5_6_API_CAPABILITIES = {
   maxOutputTokens: 128000,
 } as const;
 
-// Codex's live catalog reports a 272K input context window for GPT-5.6.
-// Keep the input and output limits explicit for catalog consumers that expose them separately.
 export const GPT_5_6_CODEX_CAPABILITIES = {
   targetFormat: "openai-responses",
   toolCalling: true,
   supportsReasoning: true,
   supportsVision: true,
   supportsXHighEffort: true,
-  contextLength: 272000,
-  maxInputTokens: 272000,
+  contextLength: 1050000,
+  maxInputTokens: 922000,
   maxOutputTokens: 128000,
 } as const;
 

tests/unit/codex-gpt56-catalog.test.ts

@@ -36,8 +36,8 @@ test("Codex catalog exposes the GPT-5.6 lineup in configured priority order", ()
   for (const modelId of expectedIds) {
     const model = models.find((entry) => entry.id === modelId);
     assert.ok(model, `codex must expose ${modelId}`);
-    assert.equal(model.contextLength, 272000);
-    assert.equal(model.maxInputTokens, 272000);
+    assert.equal(model.contextLength, 1050000);
+    assert.equal(model.maxInputTokens, 922000);
     assert.equal(model.maxOutputTokens, 128000);
     assert.equal(model.targetFormat, "openai-responses");
     assert.equal(model.toolCalling, true);