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Claude 1 vs Claude Opus 4.1

0 vs 2 benchmarks won

Anthropic
Claude 1
Anthropic
Claude Opus 4.1
Overview
CompanyAnthropicAnthropic
Release dateMar 14 2023Aug 5 2025
Model type
Open sourceNoNo
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
80.9%
Software engineering
SWE-Bench Verified
74.5%
Multimodal understanding
MMMU
Timeline
Release gapClaude 1 shipped 875 days before Claude Opus 4.1

Which is better: Claude 1 or Claude Opus 4.1?

Claude Opus 4.1 leads Claude 1 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude 1 shipped 875 days before Claude Opus 4.1, 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.

Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.

Frequently asked questions

When was Claude 1 released?
Claude 1 was released by Anthropic on Mar 14 2023.
When was Claude Opus 4.1 released?
Claude Opus 4.1 was released by Anthropic on Aug 5 2025.

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