OpenAI Codex

“Run a dedicated review against uncommitted changes, a commit, or a base branch. Codex reports prioritized findings without modifying your working tree, so you can address risks before you commit or open a pull request.”

“For most developers, Claude Code is the strongest general agent for multi-file changes from the terminal, with OpenAI Codex close behind and Cursor the best fit for working inside an editor.”

“Codex is rapidly catching up, showing adoption growth of roughly 5x, from just 3% in January 2026 to 16% in May–July 2026.”

“VS Code and compatible editors use the Codex extension; Xcode and JetBrains IDEs provide their own integrations.”

“Work with Codex beside your code. Bring open files and selections into the prompt, review edits in place, and hand off longer work without breaking your flow.”

“Browse active and completed chats, submit work to a configured environment, and apply the result to your local repository from the terminal.”

“By default, the agent runs with network access turned off. Locally, Codex uses an OS-enforced sandbox that limits what it can touch (typically to the current workspace), plus an approval policy that controls when it must stop and ask you before acting.”

“Run a dedicated review against uncommitted changes, a commit, or a base branch. Codex reports prioritized findings without modifying your working tree, so you can address risks before you commit or open a pull request.”

“Use the Codex SDK to automate coding tasks, including jobs in CI. Use the Codex app server to build custom clients that handle authentication, conversation history, approvals, and streamed agent events.”

“Browse active and completed chats, submit work to a configured environment, and apply the result to your local repository from the terminal.”

“Codex can run against a local "open source" provider such as Ollama or LM Studio when you pass --oss. Choose one for a single run with --local-provider, or set oss_provider as the default. If neither is set, the interactive CLI prompts you to choose; codex exec exits with an error.”

“A model provider defines how Codex connects to a model (base URL, wire API, authentication, and optional HTTP headers). Choose a unique ID for custom providers. Codex reserves openai, ollama, lmstudio, amazon-bedrock, amazon-bedrock-runtime, and gcp for its built-in providers.”

“For a custom model provider or gateway, use a compatible Responses API endpoint. See Custom model providers for configuration and Gateway compatibility for streaming, tool, and conversation requirements. Current Codex releases don't support wire_api = "chat" or a Chat Completions-only endpoint.”

“Enterprise-level security and controls, including SCIM, EKM, user analytics, domain verification, and role-based access control (RBAC)”

“Audit logs and usage monitoring via the Compliance API”

“Codex can run against a local "open source" provider such as Ollama or LM Studio when you pass --oss. Choose one for a single run with --local-provider, or set oss_provider as the default. If neither is set, the interactive CLI prompts you to choose; codex exec exits with an error.”

“No training on API or business data by default”

“When you use our services for individuals (Free, Plus, Pro), we may use your content to train our models. You can choose whether your conversations help improve our models. To opt out, turn off Improve the model for everyone under Settings > Data controls in ChatGPT, or select Do not train on my content in our Privacy Portal.”

“Codex has a separate Include environments setting in Codex settings for allowing training on full environments. Changing your settings in ChatGPT or the Privacy Portal does not change that setting.”

“This repository is licensed under the Apache-2.0 License.”

“You sign in with a ChatGPT account or use an API key. Codex Cloud is proprietary, and the agent is built around OpenAI models.”

“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"”

“VS Code and compatible editors use the Codex extension; Xcode and JetBrains IDEs provide their own integrations.”

“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"”

“Plus Power a few focused coding sessions each week. $20/month Get Plus Codex on the web, in the CLI, in the IDE extension, and on iOS Cloud-based integrations like automatic code review and Slack integration GPT-6.1 Sol and GPT-6 Luna Flexibly extend usage with ChatGPT credits Other ChatGPT features as part of the Plus plan”

“Free Explore Codex capabilities on quick coding tasks. $0/month Get Free GPT-6 Luna at Standard speed in the desktop app, subject to rollout Go Use Codex for lightweight coding tasks. $8/month Get Go GPT-6 Luna at Standard speed in the desktop app, subject to rollout”

“Local messages and cloud chats share your plan's usage allowance. Weekly limits may also apply.”

“The latest clearly defined Codex user count is from June 2, 2026: OpenAI reported more than 5 million weekly active users. OpenAI's Tibo Sottiaux later named 20 and 25 million active users, without a measurement window.”

“ChatGPT Plus and Pro users who reach their usage limit can purchase additional credits to continue working without needing to upgrade their existing plan. Business, Edu, and Enterprise plans with flexible pricing can purchase additional workspace credits to continue working. All users may also run extra local chats using an API key, with usage charged at standard API rates.”

“The estimates below show local messages per five-hour period for Plus and Standard Business. Pro plans currently have no five-hour limit. Cloud tasks may use more of your allowance than local messages. Usage depends on the model and task. These estimates are not fixed message limits; check your usage dashboard for current limits and reset times.”