Claude Opus 4.1

Aug 2025
Retired 2026-08-05Replace withClaude Opus 5.5Newer versionGPT-6 LunaBetterMiMo v2.6 ProOpen weights
Claude Opus 4.1
Compare in
on
—per task?
$15 / $75per 1M in / outcache $1.50
—output speed?
200Kcontext

Rankingin thinking mode?

Retired models are left out of the current rankings.

Alternatives?

ModelScoreCostPer taskWhat changes
CheaperClaude Opus 5.5max×2.5-73%$5.98No forced tool use+5BetterGPT-5.6 Lunamedium+10%-99%$0.016OpenMiMo v2.6 Prothinking×2-98%$0.13Pass back reasoning_content+3CheaperClaude Sonnet 5.5max×2.5-87%$5.46No forced tool use+5CheaperClaude Fable 5.1max×2.3-33%$7.63Replace forced tool_choice+5

History

9 versions
2030405060Jul 25Jan 26Jul 26Release dateAA Intelligence Index 4.3.244.14.54.64.74.855.5
2030405060Jul 25Jan 26Jul 26Release dateAA Intelligence Index 4.3.244.14.54.64.74.855.5

Benchmarks

all categories
Chat & Knowledge
Humanity's Last Exam12.5
CritPt (physics)0
AA Intelligence Index 4.3.2≈22.8
AA-LCR (long context) 1.176
Vals MedCode47.2
Vals MedScribe73.9
GPQA Diamond80.9
AIME 2025 · AA archived80.3
Coding
Terminal-Bench Hard (version unstated)34.3
LiveCodeBench · AA archived65.4
Agents & Tool Use
τ²-bench · AA71.4
Writing & Language
IFBench (instructions)55.4
Vision & Documents
MMMU-Pro (vision)67.9

FAQ

How much does Claude Opus 4.1 cost?›

$15 per 1M input tokens and $75 per 1M output tokens; cached input $1.50 per 1M.

Is Claude Opus 4.1 free to use?›

There is no free API; the cheapest paid price is $15 per 1M input tokens.

How can I use Claude Opus 4.1?›

Through the API of Amazon Bedrock.

What is the context window of Claude Opus 4.1?›

200K tokens, with up to 32K output tokens.

When was Claude Opus 4.1 released? Is there a newer version?›

Released 2025-08-05. It has been superseded by Claude Opus 4.8.

Is Claude Opus 4.1 open source?›

No, Claude Opus 4.1 is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.

Can Claude Opus 4.1 read images?›

It accepts text and images, PDF files as input.

What is Claude Opus 4.1?›

Claude Opus 4.1 is a closed language model from Anthropic, released Aug 2025.

What are the best alternatives to Claude Opus 4.1?›

Claude Opus 5.5 (cheaper), GPT-5.6 Luna (better), MiMo v2.6 Pro (open weights).