gpt-5.1 API Pricing
gpt-5.1 on OpenAI costs $1.25 per 1M input tokens and $10.00 per 1M output tokens (as of ).
| Input | $1.25 / 1M tokens |
|---|---|
| Output | $10.00 / 1M tokens |
| Cached input (read) | $0.12 |
| Cache write | — |
| Batch input / output | $0.62 / $5.00 |
| Above 200K tokens (input / output) | — |
| Context window | 272K tokens |
| Max output | 128K tokens |
| Supports | vision, tool calling, reasoning, prompt caching |
| Deprecation date | |
| API model id | gpt-5.1 |
| In our records since |
What it costs for common jobs
Estimated from the list price above (no caching or batch discount).
| Job | Estimated cost |
|---|---|
| 1,000 chat replies (2,000 tokens in, 500 out each) | $7.50 |
| Summarising 100 long documents (50,000 in, 1,000 out each) | $7.25 |
| 1 million classification calls (300 in, 5 out each) | $425.00 |
Try your own numbers in the LLM API cost calculator.
Price history
- Between and : batch input price changed from — to $0.62 per 1M tokens.
Similarly priced models
| Model | Provider | Input / 1M | Output / 1M | Cached input / 1M | Context |
|---|---|---|---|---|---|
| gpt-5 | OpenAI | $1.25 | $10.00 | $0.12 | 272K |
| gpt-5-chat | OpenAI | $1.25 | $10.00 | $0.12 | 128K |
| gpt-5-chat-latest | OpenAI | $1.25 | $10.00 | $0.12 | 128K |
| gpt-5-search-api | OpenAI | $1.25 | $10.00 | $0.12 | 272K |
| gpt-5.1-chat-latest | OpenAI | $1.25 | $10.00 | $0.12 | 128K |
| gpt-4.1 | OpenAI | $2.00 | $8.00 | $0.50 | 1.04758M |
| o3 | OpenAI | $2.00 | $8.00 | $0.50 | 200K |
| gpt-3.5-turbo-16k | OpenAI | $3.00 | $4.00 | — | 16K |