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## Why `TurnContextItem` is the durable baseline used to reconstruct context diffs across resume/fork. Most of the old persisted-only fields on it are no longer read, so keeping them in rollout snapshots adds schema surface and state that can drift without affecting reconstruction. `summary` is the exception: older Codex versions require it to deserialize `turn_context` records, so keep writing a default compatibility value until that schema surface can be removed safely. ## What changed - Removed the unused persisted fields from `TurnContextItem`: trace ids, user/developer instructions, output schema, and truncation policy. - Kept `summary` with a compatibility comment and made `TurnContext::to_turn_context_item` write `ReasoningSummary::Auto` instead of live turn state. - Updated rollout/context reconstruction fixtures for the retained summary field. ## Verification - `cargo test -p codex-protocol --lib turn_context_item` - `cargo test -p codex-rollout resume_candidate_matches_cwd_reads_latest_turn_context` - `cargo test -p codex-state turn_context` - `cargo test -p codex-core --lib new_default_turn_captures_current_span_trace_id` - `cargo test -p codex-core --lib record_initial_history_resumed_turn_context_after_compaction_reestablishes_reference_context_item` - `cargo test -p codex-core --test all emits_warning_when_resumed_model_differs` - `git diff --check`
f2368b7de6
·
2026-05-18 21:54:36 +00:00
6,617 Commits
npm i -g @openai/codex
or brew install --cask codex
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
Install globally with your preferred package manager:
# 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.