GPT-5.3-Codex
Maker: OpenAI · for agents
A model for agentic coding in Codex that drives a long coding task on its own. Available only through the Responses API.
Understands
text, images
Produces
text, code
Contents verified with the vendor: 2026-08-18
Included in subscriptions
No catalogue entry marks this model as part of a plan yet. It will appear here once the plan contents are confirmed with the vendor.