8OpenAI Release Notes·
OpenAI releases GPT-5.3-Codex in Cursor and VS Code, first model under Preparedness Framework high-security tier
OpenAI has made GPT-5.3-Codex available natively in Cursor and VS Code, with API access rolling out to a limited set of customers in a phased release. This is the first model OpenAI has classified as a high-security capability under its Preparedness Framework, with safety controls described as continuing to scale alongside expanded API access. The dual significance of a new coding-specialized model and a novel safety classification tier makes this a notable release.
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Introducing GPT-5.2-Codex
OpenAI has released GPT-5.2-Codex, described as their most advanced coding model. The model features long-horizon reasoning, large-scale code transformation capabilities, and enhanced cybersecurity features. This represents a specialized coding-focused model in the GPT-5 family.
OpenAI releases GPT-5.2-Codex to Responses API
OpenAI has released GPT-5.2-Codex via the Responses API, a variant of GPT-5.2 specifically optimized for agentic coding tasks in Codex and similar environments. The release extends the GPT-5.2 model family with a coding-specialized deployment. This is a tier-1 announcement from OpenAI's official release notes.
Introducing GPT-5.3-Codex
OpenAI has announced GPT-5.3-Codex, described as a Codex-native agent combining frontier coding performance with general reasoning capabilities. The model is designed to support long-horizon, real-world technical work. The announcement positions it as an agentic coding system rather than a standalone language model.
OpenAI releases GPT-5.4 in Codex with native computer-use and 1M context window
OpenAI has made GPT-5.4 available across all Codex surfaces — the app, CLI, IDE extension, and Codex Cloud — positioning it as the recommended model for most Codex tasks. GPT-5.4 is the first general-purpose model in Codex with native computer-use capabilities and experimental support for a 1M token context window. The release also includes stronger tool use and tool search for agentic workflows, and the model is available via API.
GPT-5.1-Codex-Max System Card
OpenAI has published the system card for GPT-5.1-Codex-Max, a coding-focused model variant. The card details model-level safety mitigations including specialized safety training against harmful tasks and prompt injection attacks, as well as product-level controls such as agent sandboxing and configurable network access. This represents OpenAI's formal safety documentation for an agentic coding model deployment.
OpenAI releases GPT-5.3-Codex to the Responses API
OpenAI has made GPT-5.3-Codex available through its Responses API. The release note is minimal, providing no benchmark claims or capability details beyond the availability announcement. GPT-5.3-Codex appears to be a code-specialized variant in the GPT-5 family.
OpenAI makes GPT-5.2-Codex available via API
OpenAI has released GPT-5.2-Codex to the API and for users accessing Codex with an API key. The announcement is brief, with no benchmark claims or capability details disclosed. This extends API access to a coding-specialized variant of GPT-5.2.
OpenAI releases GPT-5.3-Codex, upgraded agentic coding model with faster inference and real-time steering
OpenAI released GPT-5.3-Codex, an incremental upgrade to GPT-5.2-Codex targeting complex software engineering tasks. The new model runs 25% faster, improves reasoning and professional knowledge, and adds better real-time collaboration features including progress updates and in-session steering. It is available immediately across ChatGPT paid plans via the Codex app, CLI, IDE extension, and Codex Cloud, with API access forthcoming.