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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.

18 stories · updated Oct 27
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Key facts

Checked Oct 9
Codex CLI introduced
April 16, 2025 (open source)
Codex cloud agent
May 16, 2025 (codex-1)
CLI license
Apache-2.0

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Agents · ExplainerOpenAI Codex explained: where it runs, which models and limits you get, and how its sandbox worksWhat Codex is in October 2026, from OpenAI's docs and pricing pages: where it runs, which plans get which models, how far the allowance goes, and what its sandbox enforces.·7 min read
Developers · GuideCodex CLI background daemon: what it does, why it starts by default and how to turn it offSince version 0.157.0 (September 25, 2026), Codex CLI starts a shared background server that outlives your terminal and updates itself hourly. What the Codex CLI background daemon does, what it costs in disk and network, and how to turn it off with the commands and settings OpenAI ships.·8 min read

Latest on Codex

Models · NewsGPT-6.1 Terra: $1/$5 per million tokens, half GPT-6.1 Sol's price, in ChatGPT Work, Codex and the APIGPT-6.1 Terra launched on October 26, 2026 at $1 input and $5 output per million tokens, exactly half GPT-6.1 Sol's API price. It's in ChatGPT Work, Codex and the API, but not in the Chat tab. Prices, limits, OpenAI's benchmark claims and how it compares with Sol.·6 min readDevelopers · ExplainerOpenAI CLI explained: what OpenAI's official command-line tool does, and how it differs from Codex CLIThe OpenAI CLI is OpenAI's official `openai` command for calling its API from a terminal: Responses, files, images, audio and admin endpoints, with an API key. Codex CLI is a coding agent. How to install the OpenAI CLI, what it covers and how the two tools differ, as of October 23, 2026.·7 min readDevelopers · GuideCodex CLI background daemon: what it does, why it starts by default and how to turn it offSince version 0.157.0 (September 25, 2026), Codex CLI starts a shared background server that outlives your terminal and updates itself hourly. What the Codex CLI background daemon does, what it costs in disk and network, and how to turn it off with the commands and settings OpenAI ships.·8 min readIndustry · NewsOpenAI in early talks to acquire Trail of Bits, The Information reports: what's known about the deal and Patch the PlanetThe Information reported on October 13, 2026, that OpenAI is in early talks to buy Trail of Bits, the security firm it already works with on Patch the Planet, an open-source bug-fixing initiative. Deal size is unknown and neither company has commented publicly.·4 min readModels · NewsGPT-6.1 Sol Ultrafast and GPT-6 in ChatGPT: what changed after OpenAI DevDay, with pricesGPT-6.1 Sol got an Ultrafast mode in the API on October 8 at six times the standard price, and GPT-6 reached free ChatGPT users. Here's what changed between DevDay and October 12, 2026.·5 min readProducts · ExplainerChatGPT plans compared (October 2026): Free, Go, Plus, Pro 100/200/500, Business and Enterprise prices and limitsChatGPT now has eight price points, from $0 to the $500 Pro 500 plan. Prices, models, Work and Codex allowances, dots, Ultrafast and context windows for every ChatGPT plan, from OpenAI's own pages, as of October 12, 2026.·7 min readDevelopers · ExplainerSign in with ChatGPT explained: using your Plus or Pro plan in Devin, Notion, Vercel and other appsSince September 29, 2026, Sign in with ChatGPT lets Plus and Pro subscribers spend their plan's usage in 16 partner tools, including Devin, Notion, Vercel and Warp. How identity sign-in differs from plan usage, what's shared, the limits you can set, and how developers integrate it.·7 min readIndustry · NewsOpenAI reportedly seeks $30 billion at a $1.4 trillion valuation as it deepens Atlassian dealThe funding talks are unconfirmed and OpenAI's IPO has slipped to 2027. The Atlassian expansion, announced October 6, is the part OpenAI has put in writing.·4 min readDevelopers · NewsOpenAI's Agents API puts the Codex harness behind one endpoint: what developers get, and what they give upIn public beta since September 10, with computer use added September 29. How sessions, sandboxes and approvals work, what it costs, and the catches.·5 min readModels · NewsGPT-6 reaches every ChatGPT user: what OpenAI shipped, what it costs, and where each model runsFour GPT-6 models in five weeks, split across ChatGPT's Chat and Work tabs, Codex and the API. Here's the verified map, with prices.·6 min read

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