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OpenAI: GPT-5.1 Chat

by OpenAI

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.

Avg Score

0.0%

0 answers

Avg Latency

0ms

0 runs

Pricing

$1.25

input

/

$10.00

output

per 1M tokens

Context

128K

tokens

Alternatives

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Other Models from OpenAI

Compare performance with other models from the same creator

ModelScoreLatencyCost/1M
OpenAI: GPT-5.287.1%4.8s$7.88
OpenAI: GPT-5.2 Pro85.5%18.2s$94.50
OpenAI: GPT-5.2 Chat84.9%4.2s$7.88
OpenAI: GPT-5 Mini80.0%8.6s$1.13
OpenAI: GPT-5 Nano78.8%13.0s$0.22
OpenAI: gpt-oss-20b73.3%6.2s$0.06
OpenAI: gpt-oss-120b47.8%11.1s$0.11
OpenAI: GPT-5.1-Codex-Max——$5.63
OpenAI: GPT-5.1——$5.63
OpenAI: GPT-5.1-Codex——$5.63
OpenAI: GPT-5.1-Codex-Mini——$1.13
OpenAI: gpt-oss-safeguard-20b——$0.19
OpenAI: GPT-5 Image Mini——$2.25
OpenAI: GPT-5 Image——$10.00
OpenAI: o3 Deep Research——$25.00
OpenAI: o4 Mini Deep Research——$5.00
OpenAI: GPT-5 Pro——$67.50
OpenAI: GPT-5 Codex——$5.63
OpenAI: GPT-4o Audio——$6.25
OpenAI: GPT-5 Chat——$5.63
OpenAI: GPT-5——$5.63
OpenAI: gpt-oss-120b——$0.0000
OpenAI: gpt-oss-120b——$0.11
OpenAI: gpt-oss-20b——$0.0000
OpenAI: o3 Pro——$50.00
OpenAI: Codex Mini——$3.75
OpenAI: o4 Mini High——$2.75
OpenAI: o3——$5.00
OpenAI: o4 Mini——$2.75
OpenAI: GPT-4.1——$5.00
OpenAI: GPT-4.1 Mini——$1.00
OpenAI: GPT-4.1 Nano——$0.25
OpenAI: o1-pro——$375.00
OpenAI: GPT-4o-mini Search Preview——$0.38
OpenAI: GPT-4o Search Preview——$6.25
OpenAI: o3 Mini High——$2.75
OpenAI: o3 Mini——$2.75
OpenAI: o1——$37.50
OpenAI: GPT-4o (2024-11-20)——$6.25
OpenAI: ChatGPT-4o——$10.00
OpenAI: GPT-4o (2024-08-06)——$6.25
OpenAI: GPT-4o-mini (2024-07-18)——$0.38
OpenAI: GPT-4o-mini——$0.38
OpenAI: GPT-4o (2024-05-13)——$10.00
OpenAI: GPT-4o——$6.25
OpenAI: GPT-4o——$12.00
OpenAI: GPT-4 Turbo——$20.00
OpenAI: GPT-3.5 Turbo (older v0613)——$1.50
OpenAI: GPT-4 Turbo Preview——$20.00
OpenAI: GPT-4 Turbo (older v1106)——$20.00
OpenAI: GPT-3.5 Turbo Instruct——$1.75
OpenAI: GPT-3.5 Turbo 16k——$3.50
OpenAI: GPT-4 (older v0314)——$45.00
OpenAI: GPT-4——$45.00
OpenAI: GPT-3.5 Turbo——$1.00

Benchmark Performance

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Quickstart

Get started with this model using OpenRouter

View on OpenRouter
import { OpenRouter } from "@openrouter/sdk";

const openrouter = new OpenRouter({
  apiKey: "<OPENROUTER_API_KEY>"
});

const completion = await openrouter.chat.completions.create({
  model: "openai/gpt-5.1-chat",
  messages: [
    {
      role: "user",
      content: "Hello!"
    }
  ]
});

console.log(completion.choices[0].message.content);

Get your API key at openrouter.ai/keys