GPT-5.3 Codex introduced (new model for coding workflows)
OpenAI introduced GPT-5.3 Codex, a new model aimed at developer and coding workflows. This is a catalog update to track availability and future pricing / API behavior changes based on the official announcement.
Impact Assessment
teams evaluating new coding models and agentic developer workflows.
validate output quality, tool-use behavior, and safety constraints on your repo; confirm pricing/limits before production rollout.
this entry links to the official announcement and will be updated when pricing, limits, or API behavior changes are verified.
Changes
Recommended Actions
Run an evaluation on your codebase: generation, refactor, and tool-use behavior. Compare against your current baseline model.
Confirm pricing, usage limits, and availability in your target region before enabling in production.
Sources
Official announcement: GPT-5.3 Codex is introduced as a new model for coding workflows.