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GPT-5.1-Codex: price, performance and context
Proprietary GPT-5.1-Codex by OpenAI costs $1.25 per 1M input and $10.00 per 1M output tokens, handles up to 400K tokens in one request (≈ 1,200 pages of text) and scores 23.7 points on the AgentKernel performance index, rank 75 of 212.
Privacy: zero data retention with one provider, not in the EU. Availability over the last 24 h: 100%.
Updated Oct 09, 2026, 17:37 UTC · openai/gpt-5.1-codex
Open in the interactive comparison
Key facts
- Licence
- Proprietary: no public weights, only through a provider API
- Input / 1M tokens
- $1.25
- Output / 1M tokens
- $10.00
- Context window
- 400K tokens
- Max. output
- 128K tokens
- Performance index
- 23.7 points · rank 75 of 212
- Coding index
- n/a
- Agentic index
- n/a
- Cost at your usage
- $3.75 / month
- Knowledge cutoff
- n/a
- In the catalog since
- Nov 13, 2025
- Capabilities
- Reasoning, Vision, Tool Calling
What do you get for $10.00?
Rules of thumb from the cost calculator, base rates without caching or taxes.
| Task | Cost per task | For $10.00 |
|---|
| Chat repliesA question with a short history, a detailed answer | $0.005 | 1,900 |
| Email draftsBullet points in, a finished email out | $0.004 | 2,300 |
| Document summariesRead 10 pages, write a one-page summary | $0.009 | 1,100 |
| Code reviewsReview and comment on 500 lines of code | $0.017 | 590 |
| Book analysesAnalyse a 300-page book in one go | $0.145 | 68 |
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