ChatGPT Official runs through Codex OAuth, so context accounting should follow
the Codex model catalog and its effective context window instead of public API
limits. This keeps GPT-5.5 at the same usable window shown by Codex while
preserving GPT-5.4's larger Codex window.
Constraint: Codex OAuth model metadata applies effective_context_window_percent to raw catalog windows
Rejected: Use public API GPT-5.5 1.05M context | Codex app and OAuth runtime clamp this model to the smaller effective window
Confidence: high
Scope-risk: narrow
Directive: Keep ChatGPT Official context values aligned to Codex model catalog behavior, not generic OpenAI API docs
Tested: bun test src/services/openaiAuth/models.test.ts src/services/compact/autoCompact.test.ts src/server/__tests__/providers.test.ts
Tested: bun run check:server
Tested: git diff --check
Not-tested: Manual desktop screenshot after rebuilding the app
0c43b270b9