Model Details
Where is GPT-5.1 Codex a perfect fit?
- Long-running, autonomous coding agents and workflows
- Continuous code review and refactoring in large repositories
- Automated test generation, CI/CD integration, and pull-request suggestions
- Interactive development in terminal or IDE via Codex CLI or extension
- Coding tasks where the model needs to think deeply, plan, and iterate over hours
Quick Model Estimate
Your GPT-5.1 Codex Cost Estimate
💰 Total Cost
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for 1000 input + 1000 output tokens
Cost Breakdown
Prices are watched for changes and checked against the provider's own page.
Pricing
Other Models in the GPT-5.1 Family
FAQs about GPT-5.1 Codex
How much does GPT-5.1 Codex cost per 1M tokens?
GPT-5.1 Codex costs between $1.25 and $2.50 per million input tokens, and between $10.00 and $20.00 per million output tokens. The range covers Standard and Priority pricing.
What does a typical workload cost with GPT-5.1 Codex?
1,000 requests of 2,000 input and 500 output tokens each — 2,000,000 input and 500,000 output tokens in total — costs $7.50 with GPT-5.1 Codex at its lowest rates. Use the calculator on this page for your own volumes.
Where can I use GPT-5.1 Codex?
GPT-5.1 Codex is available through OpenAI, from $1.25 per million input tokens.
What is GPT-5.1 Codex's context window?
GPT-5.1 Codex has a context window of 400,000 tokens, and returns up to 128,000 tokens in a single response.
Is GPT-5.1 Codex still available?
GPT-5.1 Codex is deprecated and was retired on 23 July 2026. The replacement is GPT-5.6 Sol.