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 that dynamically adapts its reasoning depth, spending more time on complex questions and responding quickly to simpler ones.
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 that dynamically adapts its reasoning depth, spending more time on complex questions and responding quickly to simpler ones.Capabilities
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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-5.4 Mini | 1.1M | $0.750 | $4.50 | Available | |
| GPT-5.4 Nano | 1.1M | $0.200 | $1.25 | Available | |
| GPT-5.4 | 1.1M | $2.50 | $15.00 | Available | |
| GPT-5.4 Pro | 1.1M | $30.00 | $180.00 | Available | |
| GPT-5.4 3.5 | — | 1.1M | — | — | Available |
| GPT-5.4 Pro 3.5 | — | 1.1M | — | — | Available |
| GPT-5.3 Chat | 128K | $1.75 | $14.00 | Available | |
| GPT-5.3 Codex | 400K | $1.75 | $14.00 | Available | |
| GPT-5.3 Codex Spark | — | 128K | — | — | Available |
| GPT-5.3 Instant | — | 128K | — | — | Available |
| GPT 5.1 Thinking | 400K | $1.25 | $10.00 | Current |