GPT 5.3 Codex now available on AI Gateway
GPT 5.3 Codex, a new model combining coding strengths and reasoning depth, is now available on AI Gateway. It's 25% faster and more token-efficient, designed for agentic work across the software lifecycle with better understanding of web development requirements.
GPT 5.3 Codex is now available on AI Gateway. GPT 5.3 Codex brings together the coding strengths of GPT-5.2-Codex and the reasoning depth of GPT-5.2 in a single model that's 25% faster and more token-efficient.
Built for long-running agentic work, the model handles research, tool use, and multi-step execution across the full software lifecycle, from debugging and deployment to product documents and data analysis. Additionally, you can steer it mid-task without losing context. For web development, it better understands underspecified prompts and defaults to more functional, production-ready output.
To use this model, set model to in the AI SDK.openai/gpt-5.3-codex
AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime. It includes built-in , support, and intelligent provider routing with automatic retries.observabilityBring Your Own Key
Learn more about , view the or try it in our .AI GatewayAI Gateway model leaderboardmodel playground
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