GPT-5.3-Codex

Proprietary

About GPT-5.3-Codex

GPT-5.3-Codex is an AI model developed by OpenAI, released in 2026, made available as a proprietary (API-only) model. GPT-5.3-Codex is OpenAI's most capable agentic coding model (Feb 5, 2026), combining Codex and GPT-5 training stacks. Th.

On this page you'll find GPT-5.3-Codex's full specifications. Review provider pricing and benchmark scores below, or compare GPT-5.3-Codex head-to-head with other AI models.

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Links

Announcement ↗ Paper ↗

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Frequently asked questions

What is GPT-5.3-Codex? ▶

GPT-5.3-Codex is OpenAI's most capable agentic coding model (Feb 5, 2026), combining Codex and GPT-5 training stacks. Th It is tracked on GenAIList with its specifications, benchmark scores and provider pricing.

Who created GPT-5.3-Codex? ▶

GPT-5.3-Codex was developed by OpenAI and released in 2026.

Is GPT-5.3-Codex open source or proprietary? ▶

GPT-5.3-Codex is a proprietary model. It is accessed through an API rather than by downloading the weights.

How much does GPT-5.3-Codex cost? ▶

Pricing for GPT-5.3-Codex depends on the provider. See the providers table on this page for the latest API rates.

How does GPT-5.3-Codex perform on benchmarks? ▶

Benchmark scores for GPT-5.3-Codex are listed on this page as they are published. You can compare it head-to-head with other models on the GenAIList compare tool.