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OpenAI: GPT-5.1

by OpenAI

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning to allocate computation dynamically, responding quickly to simple queries while spending more depth on complex tasks. The model produces clearer, more grounded explanations with reduced jargon, making it easier to follow even on technical or multi-step problems. Built for broad task coverage, GPT-5.1 delivers consistent gains across math, coding, and structured analysis workloads, with more coherent long-form answers and improved tool-use reliability. It also features refined conversational alignment, enabling warmer, more intuitive responses without compromising precision. GPT-5.1 serves as the primary full-capability successor to GPT-5

Avg Score

0.0%

0 answers

Avg Latency

0ms

0 runs

Pricing

$1.25

input

/

$10.00

output

per 1M tokens

Context

400K

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 Nano78.9%13.0s$0.22
OpenAI: gpt-oss-20b73.4%6.2s$0.06
OpenAI: gpt-oss-120b48.0%11.1s$0.11
OpenAI: GPT-5.1-Codex-Max——$5.63
OpenAI: GPT-5.1 Chat——$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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Score Over Time

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Benchmark Activity

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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",
  messages: [
    {
      role: "user",
      content: "Hello!"
    }
  ]
});

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

Get your API key at openrouter.ai/keys