GPT-5.1 High

by OpenAI

GPT-5.1 High is a model from OpenAI, released on November 12, 2025. It has a 400K-token context window and can generate up to 128K output tokens. API pricing is $1.25 per 1M input tokens and $10 per 1M output tokens.

GPT-5.1 High provides enhanced reasoning capabilities with high-effort thinking for complex problems. This variant offers deeper analysis and more thorough responses compared to the base model, making it ideal for challenging tasks that require extended reasoning.

Key specs

ProviderOpenAI
Release date2025-11-12
Licenseproprietary
Context window400K tokens
Max output128K tokens
Input price$1.25 / 1M tokens
Output price$10 / 1M tokens
Intelligence Score35.2

Quick answers

What is the context window of GPT-5.1 High?

GPT-5.1 High has a context window of 400K tokens, with a maximum output of 128K tokens per response.

How much does GPT-5.1 High cost?

GPT-5.1 High costs $1.25 per 1M input tokens and $10 per 1M output tokens through the API.

Is GPT-5.1 High open source?

No. GPT-5.1 High is a proprietary model from OpenAI (proprietary license).

When was GPT-5.1 High released?

OpenAI released GPT-5.1 High on November 12, 2025.

Compare on the AI leaderboard · All AI models

More models from OpenAI