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Anthropic: Claude Mythos Preview

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Claude Mythos Preview is Anthropic’s proprietary AI model, released Apr 7, 2026. Its strongest use case is agentic & tools, where it ranks in the 90th percentile of the models Model Beat tracks.

Context
—
Input
— / 1M
Output
— / 1M
Released
Apr 7, 2026
Modalities
Strongest atAgentic & Tools top 10%

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where Claude Mythos Preview lands among all models tracked on Model Beat.

90.0
Intelligence Index
Epoch AI
90th percentile of tracked models
90.0
Agentic Index
Epoch AI
90th percentile of tracked models

Agentic & Tools

1 evals
METR task horizon17.4 h

Autonomous task length

In the news

3

Compare Claude Mythos Preview with

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Frequently asked questions

What is Claude Mythos Preview?

Claude Mythos Preview is a Claude-family AI model, from Anthropic, released Apr 7, 2026.

Who created Claude Mythos Preview?

Claude Mythos Preview is an AI model developed by Anthropic, part of the Claude family, released Apr 7, 2026.

How does Claude Mythos Preview perform on benchmarks?

On standardized evaluations tracked by Epoch AI, Claude Mythos Preview scores 17.4 h on METR task horizon.

Is Claude Mythos Preview open source?

Claude Mythos Preview is a proprietary model (Limited access), available through its provider's API rather than as a downloadable open-weight model.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Oct 29, 2026.