Openai
GPT 5.3 Codex (Fast)
GPT-5.3-Codex advances both the frontier coding performance of GPT‑5.2-Codex and the reasoning and professional knowledge capabilities of GPT‑5.2, together in one model, which is also 25% faster. This enables it to take on long-running tasks that involve research, tool use, and complex execution.
Introducing GPT-5Model Snapshot
TypeLanguage
ReleaseFeb 5, 2026
Context400,000
Tagsfile-input, implicit-caching, reasoning, tool-use
Overall
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Strength Profile
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Model Details
Runtime
Max Output128,000
Streaming speed is not measured for this model yet.
Pricing
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Catalog$3.50/M in / $28.00/M out
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