OpenAI Releases GPT-5.3-Codex
Narrative
Most capable agentic coding model to date, combining GPT-5.2-Codex frontier coding with GPT-5.2 reasoning/professional knowledge in one faster (25% latency reduction) model. Enables long-running tasks with research, tool use, computer operation, mid-turn steering, and progress updates—like a human colleague.
Reality
Announced and released February 5, 2026 (minutes after Anthropic’s Opus 4.6). Available immediately to paid ChatGPT users via Codex app, CLI, IDE extensions, and web; API rollout planned soon with safety gating. First model instrumental in its own creation (used for self-debugging/evaluation). Treated as "High" in cybersecurity Preparedness Framework with comprehensive mitigations, trusted access controls, and monitoring.
Implication
Expands Codex beyond code writing to full professional computer workflows and multi-day complex builds. Accelerates agentic development while addressing heightened cyber risks through precautionary safeguards. Intensifies OpenAI-Anthropic rivalry in agentic coding tools. Signals shift toward steerable, persistent AI teammates.