When was Claude Opus 4.6 released?

Claude Opus 4.6 was released by Anthropic on Feb 5 2026.

When was Claude Sonnet 4 released?

Claude Sonnet 4 was released by Anthropic on May 22 2025.

Which is better on GPQA Diamond, Claude Opus 4.6 or Claude Sonnet 4?

Claude Opus 4.6 scores higher on GPQA Diamond — Claude Opus 4.6 91.3% vs Claude Sonnet 4 75.4%.

Which is better at coding, Claude Opus 4.6 or Claude Sonnet 4?

On SWE-Bench Verified (real-world software-engineering tasks), Claude Opus 4.6 leads — Claude Opus 4.6 scores 80.8% and Claude Sonnet 4 scores 72.7%.

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Claude Opus 4.6 vs Claude Sonnet 4

2 vs 0 benchmarks won

	Anthropic Claude Opus 4.6	Anthropic Claude Sonnet 4
Overview
Company	Anthropic	Anthropic
Release date	Feb 5 2026	May 22 2025
Model type	—	—
Open source	No	No
Specifications
Parameters	—	—
Context window	—	—
Benchmarks
Science reasoning GPQA Diamond	91.3%	75.4%
Software engineering SWE-Bench Verified	80.8%	72.7%
Multimodal understanding MMMU	—	—
Timeline
Release gap	Claude Sonnet 4 shipped 259 days before Claude Opus 4.6

Which is better: Claude Opus 4.6 or Claude Sonnet 4?

Claude Opus 4.6 leads Claude Sonnet 4 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Sonnet 4 shipped 259 days before Claude Opus 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 Opus 4.6 scores 91.3%, 15.9 points above Claude Sonnet 4 at 75.4%. On SWE-Bench Verified, Claude Opus 4.6 scores 80.8%, 8.1 points above Claude Sonnet 4 at 72.7%.

Frequently asked questions

When was Claude Opus 4.6 released?: Claude Opus 4.6 was released by Anthropic on Feb 5 2026.
When was Claude Sonnet 4 released?: Claude Sonnet 4 was released by Anthropic on May 22 2025.
Which is better on GPQA Diamond, Claude Opus 4.6 or Claude Sonnet 4?: Claude Opus 4.6 scores higher on GPQA Diamond — Claude Opus 4.6 91.3% vs Claude Sonnet 4 75.4%.
Which is better at coding, Claude Opus 4.6 or Claude Sonnet 4?: On SWE-Bench Verified (real-world software-engineering tasks), Claude Opus 4.6 leads — Claude Opus 4.6 scores 80.8% and Claude Sonnet 4 scores 72.7%.