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GPT-5.3-CodexAPI
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2.
Prices update automatically — checked daily against provider list prices.
- $4.81 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 23% of the 220 commercial models tracked here
- 69 of 94 OpenAI models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for GPT-5.3-Codex, measured by Artificial Analysis. Higher is better. Measurement mode: Xhigh.
About this model
GPT-5.3-Codex is a commercial AI model by OpenAI. The specifications below are tracked automatically: pricing is refreshed daily from public list prices, so the numbers on this page reflect the current cost of using the model through its API.
Frequently asked questions
What is GPT-5.3-Codex?
GPT-5.3-Codex is an AI language model from OpenAI. It is a proprietary model, available through an API.
Is GPT-5.3-Codex free?
GPT-5.3-Codex is not free: it costs $1.75 per million input tokens and $14 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
What is GPT-5.3-Codex good at?
Independent benchmarks from Artificial Analysis give it GPQA 91.5%, Humanity's Last Exam 42.5%, Long Context Reasoning 83.3%, IFBench 75.4%, τ²-Bench 86%, Terminal-Bench Hard 53%.
How fast is GPT-5.3-Codex?
It generates about 81.5 tokens per second, with a median 37.96s delay before the first token. Measured independently by Artificial Analysis.