LLMAPI only
GPT-5.1
OpenAI
Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error
Superseded by GPT-5.2
Specifications
- Type
- LLM
- Access
- API only
- Released
- November 12, 2025
- License
- Proprietary
- Context window
- 400,000 tokens
- Output speed
- 115 tok/s
- Latency (TTFT)
- 0.77s
- Input
- Text, Image
- Output
- Text
- API pricing
- $1.25 in · $10.00 out / 1M tokens
Capabilities
Function callingStructured outputWeb search
Benchmarks
Our take
Mid-cycle update shipping Instant (adaptive reasoning) and Thinking variants with a warmer, more steerable personality, at the same price as GPT-5.