When was Claude Opus 4.1 released?

Claude Opus 4.1 was released by Anthropic on Aug 5 2025.

When was DeepSeek-V4-Flash released?

DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.

Which scores higher on GPQA Diamond, Claude Opus 4.1 or DeepSeek-V4-Flash?

DeepSeek-V4-Flash leads on GPQA Diamond — Claude Opus 4.1 80.9% vs DeepSeek-V4-Flash 88.1%.

Is Claude Opus 4.1 or DeepSeek-V4-Flash open source?

DeepSeek-V4-Flash is an open-source / open-weight model released by DeepSeek. Claude Opus 4.1 is a proprietary model released by Anthropic.

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Latest Release

Claude Opus 4.8

May 28 2026

Home/Compare/Claude Opus 4.1 vs DeepSeek-V4-Flash

Claude Opus 4.1 vs DeepSeek-V4-Flash

0 vs 1 benchmarks won

	Anthropic Claude Opus 4.1	DeepSeek DeepSeek-V4-Flash
Overview
Company	Anthropic	DeepSeek
Release date	Aug 5 2025	Apr 24 2026
Model type	—	—
Open source	No	Yes
Specifications
Parameters	—	—
Context window	—	—
Benchmarks
Coding SWE-Bench Verified	74.5%	—
Science GPQA Diamond	80.9%	88.1%Best
Timeline
Release gap	Claude Opus 4.1 shipped 262 days before DeepSeek-V4-Flash

Which is better: Claude Opus 4.1 or DeepSeek-V4-Flash?

DeepSeek-V4-Flash leads Claude Opus 4.1 on 1 of the 1 benchmark they both report (GPQA Diamond). Claude Opus 4.1 shipped 262 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.

DeepSeek-V4-Flash is an open-source / open-weight model; Claude Opus 4.1 is proprietary.

On GPQA Diamond, DeepSeek-V4-Flash leads at 88.1% vs Claude Opus 4.1 at 80.9%.

Frequently asked questions

When was Claude Opus 4.1 released?: Claude Opus 4.1 was released by Anthropic on Aug 5 2025.
When was DeepSeek-V4-Flash released?: DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.
Which scores higher on GPQA Diamond, Claude Opus 4.1 or DeepSeek-V4-Flash?: DeepSeek-V4-Flash leads on GPQA Diamond — Claude Opus 4.1 80.9% vs DeepSeek-V4-Flash 88.1%.
Is Claude Opus 4.1 or DeepSeek-V4-Flash open source?: DeepSeek-V4-Flash is an open-source / open-weight model released by DeepSeek. Claude Opus 4.1 is a proprietary model released by Anthropic.