gpt-5-3-codex-is-now-on-ai-gateway (opens in new tab)

# GPT 5\.3 Codex is now on AI Gateway **Published:** February 24, 2026 | **Authors:** Walter Korman, Jerilyn Zheng --- 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 deployme...

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