Topic · Product
Codex
Codex is OpenAI's coding agent, available in the terminal, in editors, in the cloud and inside ChatGPT. The name is older than the product: OpenAI used it in 2021 for a code-generation model that powered the first GitHub Copilot, and reused it in 2025 for the agent covered here.
Fact file
Codex CLI introducedApril 16, 2025 (open source)
Codex cloud agentMay 16, 2025 (codex-1)
CLI licenseApache-2.0
Plan access (per OpenAI)Included in ChatGPT plans; Plus $20/mo; Pro $100, $200 or $500/mo; Business $20/user/mo billed annually or $25 monthly (2+ seats)
Codex CLI version0.162.0 (npm latest, published October 8, 2026)
Original 2021 Codex modelAnnounced August 10, 2021; deprecated March 2023
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Latest on Codex
Oct 9Business · NewsOpenAI reportedly seeks $30 billion at a $1.4 trillion valuation as it deepens Atlassian dealOct 9Developer tools · NewsOpenAI's Agents API puts the Codex harness behind one endpoint: what developers get, and what they give upOct 9Models · NewsGPT-6 reaches every ChatGPT user: what OpenAI shipped, what it costs, and where each model runsOct 9Agents · AnalysisThe case against unattended agents: what went wrong, and how sandboxing actually worksOct 9Agents · BenchmarksSWE-bench, Terminal-Bench and METR: what coding-agent evaluations measure, and what their results don't proveOct 9Apps · CompareChatGPT vs Claude for coding and writing: plans, models and limits comparedOct 9Agents · CompareClaude Code vs Codex vs Cursor: features, prices and limits compared (October 2026)Oct 9Agents · ExplainerOpenAI Codex explained: where it runs, which models and limits you get, and how its sandbox worksOct 9Developer tools · GuideHow to write a CLAUDE.md or AGENTS.md file that coding agents actually followOct 9Business · ExplainerOpenAI explained: who controls it, what it sells, and how it makes money
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Timeline
MAY 2025Codex cloud agent
APR 2025Codex CLI introduced