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# GPT 5.3 Codex is now on AI Gateway

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Pauline P. Narvas (@pawlean) · 2026-02-25 · ♥ 3

<p>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.</p><p>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.</p><p>To use this model, set model to <code>openai/gpt-5.3-codex</code> in the AI SDK.</p>

Read the full changelog:

https://vercel.com/changelog/gpt-5-3-codex-is-now-on-ai-gateway