OpenAI: GPT-5.1 Chat
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
Everything else
| Max output | 32K |
|---|---|
| Input / 1M | $1.25 |
| Output / 1M | $10 |
| Cache read / 1M | $0.13 |
| Cache write / 1M | — |
| 1M in + 1M out | $11.25 |
| Takes | file, image, text |
| Returns | text |
| Tools | yes |
| Reasoning | no |
| Open weights | no |
| Released | 2025-11-13 |
| Knowledge cutoff | — |
| Retires | — |
| Catalog id | openai/gpt-5.1-chat |
Using it
In 00, this model is picked per agent — and per tier, so the model that answers your customers need not be the one that writes your code. Get 00.