SF·SIX / MODEL PROFILE
OpenAI GPT-5.1
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...
OpenAI GPT-5.1 costs $1.25 per 1M input tokens and $10.00 per 1M output tokens at the standard tier, the lowest default-region price among the 2 providers SF·SIX tracks, from OpenAI. Cached input reads cost $0.125 per 1M tokens. Updated ; prices checked .
- Developer
- OpenAI
- Input modalities
- image, text, file
- Output modalities
- text
- Context tokens
- 400,000
- Latest price observation
- 2026-10-17
- Lowest paired standard token quote
- $1.25 input / $10.00 output per 1M tokens
Dated price and provider records
| Provider and channel | Input | Output or native rate | Unit and status | Source and observation |
|---|---|---|---|---|
| AzureOpenRouter | $1.25 | $10.00 | 1M tokenspriced · USD | OpenRouter2026-10-17 |
| OpenAIOpenRouter | $1.25 | $10.00 | 1M tokenspriced · USD | OpenRouter2026-10-17 |
| AzureOpenRouter · swedencentral region | $1.38 | $11.00 | 1M tokenspriced · USD | OpenRouter2026-10-17 |
| OpenAIOpenRouter · Fast tier | $2.50 | $20.00 | 1M tokenspriced · USD | OpenRouter2026-10-17 |
| OpenAIOpenRouter · Flex tier | $0.625 | $5.00 | 1M tokenspriced · USD | OpenRouter2026-10-17 |
Batch and free variants
- GPT-5.1 (batch) · from $0.625 input / $5.00 output per 1M tokens
These are dated, non-executable observations. Verify the exact endpoint, price and terms with the source before use. Unknown values are not free.