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OpenAI: GPT-5.1 Chat

openai/gpt-5.1-chat
Nov 13, 2025128K context16.4K max output$1.25/M in · $10.00/M out

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.

Specifications

Provider
openai
Context Length
128K
Max Output
16.4K
Modality
Infileimagetext
Outtext

Pricing

TypePrice / 1M tokens
Input$1.25
Output$10.00
Cache Read$0.13
Web Search$0.01 / call

Quick Start

curl https://api.ominigate.ai/v1/chat/completions \
  -H "Authorization: Bearer sk-omg-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.1-chat",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'