GPT-5.1
Refined GPT-5 with improved tone and efficiency.
- Image input
- Reasoning
- Coding
- Tool calling
- Structured output
- Streaming
Specifications
| Provider | OpenAI |
|---|---|
| API model ID | gpt-5.1 |
| Released | November 2025 |
| Context window | 400,000 tokens |
| Max output | 128,000 tokens |
| Reasoning model | Yes |
| Price per 1M tokens (input / output) | See provider |
Specs as published by OpenAI. Prices are standard list prices before caching or batch discounts.
More OpenAI models
FAQ
- What is the context window of GPT-5.1?
- GPT-5.1 accepts up to 400,000 tokens of context and can return up to 128,000 output tokens per reply.
- When was GPT-5.1 released?
- OpenAI released GPT-5.1 in November 2025.
- How do I use GPT-5.1?
- Add your OpenAI API key in DapperGPT, pick GPT-5.1 in the model picker, and start chatting. You pay OpenAI directly for usage.