OpenAI introduces GPT-5.4 mini in Codex for fast, efficient coding tasks
OpenAI has made GPT-5.4 mini available in Codex across the CLI, IDE extension, app, and API, positioning it as a faster and cheaper alternative to GPT-5.4 for lighter coding and subagent work. The model runs more than 2x faster than GPT-5.4 and consumes only 30% of the usage limits, allowing roughly 3.3x more work within the same quota. It improves over GPT-5 mini on coding, reasoning, image understanding, and tool use. Recommended use cases include codebase exploration, large-file review, and document processing, while GPT-5.4 remains preferred for complex planning and final judgment.
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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.
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.
Introducing GPT-5.4 mini and nano
OpenAI has released GPT-5.4 mini and nano, smaller and faster variants of GPT-5.4 optimized for coding, tool use, multimodal reasoning, and high-volume API and sub-agent workloads. These models are positioned for efficiency-sensitive deployment scenarios including agentic pipelines. The release extends the GPT-5.4 family with tiered model options targeting different cost and latency tradeoffs.
OpenAI Introduces GPT-5.1-Codex-Max for Agentic Coding
OpenAI has released GPT-5.1-Codex-Max, a new model optimized for agentic coding tasks within the Codex platform. The model targets long-running, project-scale software development work with improvements in reasoning and token efficiency. It is positioned as a faster and more capable successor for autonomous coding workflows.
OpenAI releases GPT-5-Codex: GPT-5 variant optimized for agentic coding
OpenAI has published an addendum to the GPT-5 system card introducing GPT-5-Codex, a version of GPT-5 specifically optimized for agentic coding within the Codex environment. The model features dynamic thinking-effort adjustment, scaling compute based on task complexity—responding quickly to simple queries while sustaining longer independent work on complex coding tasks. This represents a specialized derivative of GPT-5 targeting software engineering agents rather than general-purpose use.
GPT-5.5 available in Codex with browser use and automatic approval reviews
OpenAI has made GPT-5.5 the recommended frontier model in its Codex product (CLI, IDE extension, and app), positioning it as the default for coding, debugging, refactoring, and knowledge-work tasks. The Codex app also gains two new capabilities: browser use allowing Codex to operate an in-app browser for local development servers and visual bug reproduction, and an automatic approval review agent that pre-screens eligible approval prompts with risk-level assessments. Users on older versions must update to access GPT-5.5, with GPT-5.4 as the fallback during rollout.
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.
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.