GPT-5.3-Codex
Released
GPT-5.3-Codex is an AI model released by OpenAI on Thursday, Feb 5 2026, 56 days after GPT-5.2. Benchmark results (shown below) cover BullshitBench v2, SWE-Bench Verified, Next.js Evals, and OSWorld-Verified.
API pricing
- InputWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it.
- $1.75
- Cached inputA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again.
- $0.175
- OutputWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one.
- $14.00
Available from
Benchmarks
Coding
Agentic & tool use
Robustness
Source: BenchLM, retrieved 31 August 2026. Every other score here is the figure the lab published at launch.
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Frequently asked questions
GPT-5.3-Codex was released by OpenAI on Thursday, Feb 5 2026.
GPT-5.3-Codex was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
GPT-5.3-Codex costs $1.75 per million input tokens and $14.00 per million output tokens through the OpenAI API. Cached input is $0.175 per million tokens. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.
GPT-5.3-Codex reports 4 tracked benchmark scores — BullshitBench v2: 24%; SWE-Bench Verified: 85%; Next.js Evals: 81%; OSWorld-Verified: 64.7%. Scores are the figures published at release by OpenAI.
No. GPT-5.3-Codex is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
OpenAI's previous tracked release was GPT-5.2 on Dec 11 2025, 56 days earlier. It was followed by GPT-5.3-Codex-Spark on Feb 12 2026.