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GPT 5.1 Thinking

By OpenAI
Model family: GPT
Thinking is designed to plan steps, reconcile evidence, and return well-structured outputs for complex work. You can control depth in ChatGPT with Standard, Extended, Light, or Heavy thinking modes, and in the API by lowering reasoning effort when latency matters. The GPT-5 system routes to the thinking tier when prompts are complex or when you explicitly ask for deeper analysis.
Multimodal Gen 3
Released: November 12, 2025

Overview

The Thinking variant is the deeper-reasoning option. It adjusts how much thinking it does based on task difficulty, trading speed for accuracy when needed, and supports a user-visible thinking-time toggle in ChatGPT.

About OpenAI

OpenAI is a technology company that specializes in artificial intelligence research and innovation.

Industry: Artificial Intelligence
Company Size: 4500
Location: San Francisco, California, US
Website: openai.com
View Company Profile

Benchmark scores

How GPT 5.1 Thinking ranks on tracked AI benchmarks. Click any benchmark to see its full leaderboard.

94.6%
GPQA Diamond
Knowledge
88.1%
Compare across all benchmarks โ†’

Tools using GPT 5.1 Thinking

Last updated: April 6, 2026
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