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The generated catalog falls back to `128000` — Codex

Quick fix

Explicitly set a context window for GPT-5.6 models to avoid falling back to 128000 when none is configured.

Symptom

Section titled “Symptom”
Error output
The generated catalog falls back to `128000`.

Cause

Section titled “Cause”

When a GPT-5.6 model in the Codex provider model catalog has no per-model context window set and no top-level `model_context_window` is set, the generated `cc-switch-model-catalog.json` falls back to `128000`. After Codex reserves its usual buffer, the effective context is about `121600`, displayed in the UI as roughly `122k`.

The issue proposes that `gpt-5.6-sol`, `gpt-5.6-terra`, and `gpt-5.6-luna` should default to `272000`; explicit per-model or top-level context window values should take precedence over defaults. The issue is still open, with no confirmed fix version.

Fix

Section titled “Fix”

  1. Explicitly set the context window for the GPT-5.6 model in use, or set the top-level `model_context_window`, so the catalog no longer uses the `128000` fallback applied when nothing is configured.

Affected Versions

Section titled “Affected Versions”
ToolCodex
Version3.18.0（受影响）
PlatformsmacOS

Source Issues

Section titled “Source Issues”

This page is distilled from 1 real issues

FAQ

Section titled “FAQ”

(No FAQ yet)

Section titled “Related problems”
Default 1M Context Causes 422, CodexUpgrade to v4.0; context window and other model parameters are filled in automatically when adding or pulling a model.1 issues merged5.6sol 1m context change does not take effect - CodexThere is no maintainer-confirmed cause or fix, so it is unclear whether gpt-5.6-sol supports a 1m context.1 issues mergedContext Window Information Missing When Enabling Routing in CodexCodex loses context window information after routing is enabled; the issue provides no verified fix.1 issues merged

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