Evalry

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...

by OpenAI

Overview

Quick stats across all benchmark runs.

Score

—

14 benchmarks

Avg Latency

5.5s

20 requests

Pricing

$1.25 in / $10.00 out

per 1M tokens

Context

128K

tokens

Alternatives

Models with similar or better quality but different tradeoffs

Same Quality, Cheaper

Models with similar or better performance at a lower cost per token.

ModelCost
GPT-5 Nano-45%
GPT-5 Mini-16%

Same Quality, Faster

Models with similar or better performance but lower latency.

No alternatives found

Same Cost, Better

Models at a similar price point with higher benchmark scores.

ModelScore
GPT-5 Mini+2%

Benchmark Performance

How this model performs across different benchmarks

BenchmarkScoreRank
Money Boy Cultural Literacy Test
43%
47 / 107

Price vs Performance

Compare cost efficiency across all models

Current model (baseline)
Other models (relative score)
Y-axis shows score difference from shared benchmarks. X-axis uses log scale.

Score Over Time

Performance trends across all benchmark runs

Benchmark Activity

Number of benchmark runs over time

Quickstart

View on OpenRouter

Get started with this model using 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

Other Models from OpenAI

Compare performance with other models from the same creator

ModelLatencyCost/1MScore
GPT-5.54.9s$17.50100%
GPT-5.5 Pro28.9s$105.0077%
GPT-5.220.7s$7.8869%
GPT-5.3 Chat2.5s$7.8865%
GPT-5.4 Mini1.2s$2.6357%
GPT-5 Mini24.2s$1.1357%
GPT-5.41.8s$8.7549%
gpt-oss-20b13.6s$0.0941%
gpt-oss-120b28.7s$0.1134%
GPT-5 Nano33.8s$0.2230%
GPT-5.4 Nano—$0.73—
GPT-5.4 Pro—$105.00—
GPT-5.3-Codex2.7s$7.88—
GPT Audio—$6.25—
GPT Audio Mini—$1.50—
GPT-5.2-Codex21.7s$7.88—
GPT-5.2 Chat9.5s$7.88—
GPT-5.2 Pro47.7s$94.50—
GPT-5.1-Codex-Max25.2s$5.63—
GPT-5.130.5s$5.63—
GPT-5.1-Codex16.6s$5.63—
GPT-5.1-Codex-Mini12.6s$1.13—
gpt-oss-safeguard-20b2.4s$0.19—
GPT-5 Image Mini31.8s$2.25—
GPT-5 Image49.2s$10.00—
o3 Deep Research362.7s$25.00—
o4 Mini Deep Research151.0s$5.00—
GPT-5 Pro332.1s$67.50—
GPT-5 Codex19.7s$5.63—
GPT-4o Audio—$6.25—
GPT-5 Chat5.9s$5.63—
GPT-558.6s$5.63—
o3 Pro122.5s$50.00—
o4 Mini High26.8s$2.75—
o319.0s$5.00—
o4 Mini18.2s$2.75—
GPT-4.120.7s$5.00—
GPT-4.1 Mini11.5s$1.00—
GPT-4.1 Nano4.5s$0.25—
o1-pro95.3s$375.00—
o3 Mini High13.8s$2.75—
o3 Mini16.0s$2.75—
o123.4s$37.50—
GPT-4o (2024-11-20)12.4s$6.25—
GPT-4o (2024-08-06)9.5s$6.25—
GPT-4o5.8s$12.00—
GPT-4o (2024-05-13)4.7s$10.00—
GPT-4o-mini Search Preview6.5s$0.38—
GPT-4o Search Preview11.2s$6.25—
GPT-4 Turbo26.5s$20.00—
GPT-4 Turbo Preview15.8s$20.00—
GPT-3.5 Turbo 16k4.0s$3.50—
GPT-412.1s$45.00—
Codex Mini—$3.75—
ChatGPT-4o7.4s$10.00—
GPT-3.5 Turbo (older v0613)13.7s$1.50—
GPT-4 Turbo (older v1106)18.1s$20.00—
GPT-3.5 Turbo Instruct4.4s$1.75—
GPT-4 (older v0314)16.8s$45.00—
GPT-3.5 Turbo3.8s$1.00—
GPT Chat Latest—$17.50—
GPT-5.4 Image 241.3s$11.50—
GPT-4o-mini11.0s$0.38—
GPT-4o-mini (2024-07-18)13.2s$0.38—