When was Claude Haiku 4.5 released?

Claude Haiku 4.5 was released by Anthropic on Oct 15 2025.

When was Claude Opus 4.6 released?

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

Which is better on GPQA Diamond, Claude Haiku 4.5 or Claude Opus 4.6?

Claude Opus 4.6 scores higher on GPQA Diamond — Claude Haiku 4.5 73% vs Claude Opus 4.6 91.3%.

Which is better at coding, Claude Haiku 4.5 or Claude Opus 4.6?

On SWE-Bench Verified (real-world software-engineering tasks), Claude Opus 4.6 leads — Claude Haiku 4.5 scores 73.3% and Claude Opus 4.6 scores 80.8%.

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Home/Compare/Claude Haiku 4.5 vs Claude Opus 4.6

Claude Haiku 4.5 vs Claude Opus 4.6

0 vs 2 benchmarks won

	Anthropic Claude Haiku 4.5	Anthropic Claude Opus 4.6
Overview
Company	Anthropic	Anthropic
Release date	Oct 15 2025	Feb 5 2026
Model type	—	—
Open source	No	No
Specifications
Parameters	—	—
Context window	—	—
Benchmarks
Science reasoning GPQA Diamond	73%	91.3%
Software engineering SWE-Bench Verified	73.3%	80.8%
Multimodal understanding MMMU	—	—
Timeline
Release gap	Claude Haiku 4.5 shipped 113 days before Claude Opus 4.6

Which is better: Claude Haiku 4.5 or Claude Opus 4.6?

Claude Opus 4.6 leads Claude Haiku 4.5 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Haiku 4.5 shipped 113 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%, 18.3 points above Claude Haiku 4.5 at 73%. On SWE-Bench Verified, Claude Opus 4.6 scores 80.8%, 7.5 points above Claude Haiku 4.5 at 73.3%.

Frequently asked questions

When was Claude Haiku 4.5 released?: Claude Haiku 4.5 was released by Anthropic on Oct 15 2025.
When was Claude Opus 4.6 released?: Claude Opus 4.6 was released by Anthropic on Feb 5 2026.
Which is better on GPQA Diamond, Claude Haiku 4.5 or Claude Opus 4.6?: Claude Opus 4.6 scores higher on GPQA Diamond — Claude Haiku 4.5 73% vs Claude Opus 4.6 91.3%.
Which is better at coding, Claude Haiku 4.5 or Claude Opus 4.6?: On SWE-Bench Verified (real-world software-engineering tasks), Claude Opus 4.6 leads — Claude Haiku 4.5 scores 73.3% and Claude Opus 4.6 scores 80.8%.