GPT-5.1 Thinking
GPT-5.1 Thinking is OpenAI's language model with a 400K context window and up to 128K output tokens, starting at $1.25 / 1M input and $10.00 / 1M output. A GPT-5.1 variant with adaptive thinking that allocates more reasoning time to complex queries while responding quickly to simpler ones.
Capabilities
Input2/5
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Output1/5
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Capabilities3/13
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Pricing by Provider
| Provider | Standard | ||
|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | |
 Vercel AI Gateway | $1.25 | $10.00 | $0.125 |
Cost Calculator
Preset:
Compares every provider & tier in USD
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| GPT-5.1 Thinking | 400K | $1.25 | $10.00 | Current | |
| GPT-5 Mini Image | 400K | $2.50 | $2.00 | Available | |
| GPT-5 Image | 400K | $10.00 | $10.00 | Available | |
| GPT-5 Pro | 400K | $15.00 | $120.00 | Available | |
| GPT-5 Codex | 400K | $1.25 | $10.00 | Available | |
| GPT-5 | 410K | $1.25 | $10.00 | Available | |
| GPT-5 Chat | 128K | $1.25 | $10.00 | Available | |
| GPT-5 Mini | 400K | $0.250 | $2.00 | Available | |
| GPT-5 Nano | 400K | $0.050 | $0.400 | Available | |
| GPT-5 ChatGPT | — | — | — | — | Available |
| GPT-5 Low | — | — | — | — | Available |