When was Claude Sonnet 4.6 released?

Claude Sonnet 4.6 was released by Anthropic on Feb 17 2026.

When was GPT-5.1 released?

GPT-5.1 was released by OpenAI on Nov 12 2025.

Which is better on GPQA Diamond, Claude Sonnet 4.6 or GPT-5.1?

Claude Sonnet 4.6 scores higher on GPQA Diamond — Claude Sonnet 4.6 89.9% vs GPT-5.1 88.1%.

Which is better at coding, Claude Sonnet 4.6 or GPT-5.1?

On SWE-Bench Verified (real-world software-engineering tasks), Claude Sonnet 4.6 leads — Claude Sonnet 4.6 scores 79.6% and GPT-5.1 scores 76.3%.

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Home/Compare/Claude Sonnet 4.6 vs GPT-5.1

Claude Sonnet 4.6 vs GPT-5.1

2 vs 1 benchmarks won

	Anthropic Claude Sonnet 4.6	OpenAI GPT-5.1
Overview
Company	Anthropic	OpenAI
Release date	Feb 17 2026	Nov 12 2025
Model type	—	—
Open source	No	No
Specifications
Parameters	—	—
Context window	—	—
Benchmarks
Science reasoning GPQA Diamond	89.9%	88.1%
Software engineering SWE-Bench Verified	79.6%	76.3%
Multimodal understanding MMMU	—	76%
Timeline
Release gap	GPT-5.1 shipped 97 days before Claude Sonnet 4.6

Which is better: Claude Sonnet 4.6 or GPT-5.1?

Claude Sonnet 4.6 leads GPT-5.1 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). GPT-5.1 shipped 97 days before Claude Sonnet 4.6, so benchmark comparisons should account for the intervening progress.

Published specifications for these two models are limited — see each model page for the latest details.

On GPQA Diamond, Claude Sonnet 4.6 scores 89.9%, 1.8 points above GPT-5.1 at 88.1%. On SWE-Bench Verified, Claude Sonnet 4.6 scores 79.6%, 3.3 points above GPT-5.1 at 76.3%.

Frequently asked questions

When was Claude Sonnet 4.6 released?: Claude Sonnet 4.6 was released by Anthropic on Feb 17 2026.
When was GPT-5.1 released?: GPT-5.1 was released by OpenAI on Nov 12 2025.
Which is better on GPQA Diamond, Claude Sonnet 4.6 or GPT-5.1?: Claude Sonnet 4.6 scores higher on GPQA Diamond — Claude Sonnet 4.6 89.9% vs GPT-5.1 88.1%.
Which is better at coding, Claude Sonnet 4.6 or GPT-5.1?: On SWE-Bench Verified (real-world software-engineering tasks), Claude Sonnet 4.6 leads — Claude Sonnet 4.6 scores 79.6% and GPT-5.1 scores 76.3%.