GPT-5.3-Codex
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
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
EU-Hosted Inference API
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$0.40 / $1.40
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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 use GPT-5.3-Codex in LLMBase Chat?
Yes. Use the chat action on this page to open GPT-5.3-Codex in LLMBase Chat. Access still follows the current plan and model tier.
Does GPT-5.3-Codex support images or audio?
GPT-5.3-Codex can understand images.
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Benchmarks and pricing use Artificial Analysis where available. Catalog specs are used as a fallback.