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## Why Pre-sampling compaction intentionally uses the previous turn's model when the compaction compatibility hash changes or when switching to a model with a smaller context window. This keeps compaction aligned with the settings that produced the history, but it can block the next turn when a resumed ChatGPT thread still references a model slug that has since been retired. The Codex backend rejects that compaction request before the user's currently selected model gets a chance to sample. This PR lets those threads recover without changing previous-model compaction behavior for API-key authentication or custom providers. It is stacked on #31316, which is a behavior-preserving extraction of the individual remote compaction attempts; this PR contains the fallback behavior. ## What changed - For automatic previous-model compaction, capture the selected model's request context when using ChatGPT authentication with the OpenAI provider and the selected model differs from the previous model. - If the previous-model attempt returns an `InvalidRequest`, retry compaction once with the selected model for both `/responses/compact` and Responses Compaction V2. - Complete history processing, lifecycle events, and token accounting with the context of the model that successfully compacted the thread. - If the fallback also fails, return the original previous-model error so the retry does not change the user-visible failure. - Record fallback attempts with reason, implementation, and outcome telemetry. - Leave API-key authentication, custom providers, same-model turns, and non-`InvalidRequest` failures on their existing paths. ## Testing - `just test -p codex-core -E 'test(pre_sampling_compact) | test(model_unavailable_error)'` (10 tests) - Added integration coverage for a resumed thread whose model was renamed, a model downshift using Responses Compaction V2, and API-key authentication with a custom provider.
Codex CLI is a coding agent from OpenAI that runs locally on your computer.
If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run
codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Run the following on Mac or Linux to install Codex CLI:
curl -fsSL https://chatgpt.com/codex/install.sh | sh
Run the following on Windows to install Codex CLI:
powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"
Codex CLI can also be installed via the following package managers:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
You can also go to the latest GitHub Release and download the appropriate binary for your platform.
Each GitHub Release contains many executables, but in practice, you likely want one of these:
- macOS
- Apple Silicon/arm64:
codex-aarch64-apple-darwin.tar.gz - x86_64 (older Mac hardware):
codex-x86_64-apple-darwin.tar.gz
- Apple Silicon/arm64:
- Linux
- x86_64:
codex-x86_64-unknown-linux-musl.tar.gz - arm64:
codex-aarch64-unknown-linux-musl.tar.gz
- x86_64:
Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.
Using Codex with your ChatGPT plan
Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Business, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.
You can also use Codex with an API key, but this requires additional setup.
Docs
This repository is licensed under the Apache-2.0 License.