Benchable
File input
Text input
Image input
Text output
Author's Description
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 harder queries, improving accuracy on math, coding, and multi-step tasks without slowing down typical conversations. The model is warmer and more conversational by default, with better instruction following and more stable short-form reasoning. GPT-5.1 Chat is designed for high-throughput, interactive workloads where responsiveness and consistency matter more than deep deliberation.
Key Specifications
Context
128K
Released
Nov 13, 2025
Supported Parameters
This model supports the following parameters:
Presence Penalty
Temperature
Stop
Max Tokens
Structured Outputs
Logit Bias
Seed
Top Logprobs
Logprobs
Top P
Frequency Penalty
Response Format
Features
This model supports the following features:
Response Format
Structured Outputs
Model Pricing
Current Pricing
| Feature | Price (per 1M tokens) |
|---|---|
| Prompt | $1.25 |
| Completion | $10 |
| Input Cache Read | $0.125 |
| Web Search | $10000 |
Price History
Available Endpoints
| Provider | Endpoint Name | Context Length | Pricing (Input) | Pricing (Output) |
|---|---|---|---|---|
|
OpenAI
|
OpenAI | openai/gpt-5.1-chat-20251113 | 128K | $1.25 / 1M tokens | $10 / 1M tokens |
No benchmark execution results are available for this model yet.
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