GPT 5.3 Codex is now on AI Gateway
By Steven Van ·
GPT 5.3 Codex pairs GPT-5.2-Codex's coding skills with GPT-5.2's reasoning, running 25% faster for agentic and web dev work.
Vercel's AI Gateway now offers GPT 5.3 Codex, a model that combines the coding strengths of GPT-5.2-Codex with the reasoning depth of GPT-5.2, running 25% faster and more token-efficient than its predecessors. It's built for long-running agentic work: research, tool use, and multi-step execution across debugging, deployment, product documents, and data analysis, and it can be steered mid-task without losing context. For web development specifically, it better handles underspecified prompts and defaults to more functional, production-ready output.
To use it, set the model to openai/gpt-5.3-codex in the AI SDK. The announcement has more on AI Gateway's unified API for usage tracking, retries, and failover.
