## Why Compaction analytics need token counts that better represent the request being compacted. The existing session snapshot can diverge from the actual remote compaction request after output rewriting, and remote v2 can use server-side Responses usage when available. ## What changed - Add an optional `active_context_tokens_before` override to `CompactionAnalyticsAttempt::track(...)` for remote compaction when it has a better before-token value than the begin-time session snapshot. The local `/compact` path passes no override. - For remote v1 `responses_compact`, subtract the estimated token delta from pre-compaction output rewriting from the session snapshot, capped by locally-added tokens since the last successful API response. - For remote v2 `responses_compaction_v2`, use the same bounded output-rewrite fallback as remote v1, then overwrite `active_context_tokens_before` with server `token_usage.input_tokens` from the `response.completed` event when present. - Keep the existing v2 compaction-output validation while carrying the completed response token usage through `collect_compaction_output`. ## Verification - `just fmt` - `just test -p codex-core collect_compaction_output_accepts_additional_output_items` - `git diff --check`
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.
