GPT-5.3-Codex
byOpenAI
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. It achieves state-of-the-art results...
Specifications
Technical details and pricing.
Benchmarks
7 benchmark scores from Artificial Analysis.
Composite Indices
Intelligence, Coding, Math
Standard Benchmarks
Academic and industry benchmarks
Frequently Asked Questions
What is GPT-5.3-Codex good for?
Use GPT-5.3-Codex for everyday tasks like writing, summarizing, brainstorming, and getting clear explanations.
How much does GPT-5.3-Codex cost?
Pricing is based on usage. Current rates are $1.75/1M tokens for input and $14.00/1M tokens for output.
Can I try GPT-5.3-Codex for free?
Yes. You can start a chat instantly and test the model before deciding on a plan.
Does GPT-5.3-Codex support images or audio?
GPT-5.3-Codex can understand images.
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Benchmarks and pricing are sourced from Artificial Analysis where available. OpenRouter specs are used as a fallback.