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Codex CLI

Made by openai · github.com/openai/codex

OpenAI's open-source coding agent that runs locally in the terminal.

Facts

Made by
OpenAI
Interface
Terminal CLI
Models
OpenAI models
Licence
Apache-2.0
How it's billed
Open-source client. Usage is billed through a ChatGPT plan or an OpenAI API key. Vendor pricing
GitHub stars
129,886 (live from GitHub API, 2026-10-19)
Links
Website/docs · github.com/openai/codex

AgentRank Score: 99/100 #12 of 1,604

Popularity ×30%99
Adoption ×20%99
Activity ×25%100
Momentum ×15%97
Openness ×10%100

Computed from public GitHub data. This measures traction and upkeep, not how well the agent does tasks. How the score works

Task results

Task #1: Fix a broken authentication flow

Not yet tested

No verified run yet. We don't estimate.

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AgentRank badge for Codex CLI

Reproduce with this agent

Suggested headless invocation. Check it against the agent's current docs, because CLI flags change.

node harness/run.mjs run --task auth-fix-01 --agent codex-cli \
  --cmd 'codex exec --full-auto "$(cat TASK.md)"'

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