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Claude Mythos Preview

Claude Mythos Preview is an unreleased general-purpose frontier model from Anthropic, a new tier above Opus (internal codename 'Capybara'). It identified thousands of zero-day vulnerabilities across e

Claude Mythos Preview is an unreleased general-purpose frontier model from Anthropic, a new tier above Opus (internal codename 'Capybara'). It identified thousands of zero-day vulnerabilities across every major operating system and web browser as part of Project Glasswing, a cross-industry cybersecurity initiative with 12 partners including AWS, Apple, Microsoft, and Google. State-of-the-art on SWE-bench Verified (93.9%), GPQA Diamond (94.6%), USAMO (97.6%), Terminal-Bench 2.0 (82.0%), CyberGym

LLMs
Free tier

Intelligence

Popularity49/100
Monthly visits
Growth
Updated2026-05-21

Features

GPQA
MMLU
MMLU-Pro
AIME 2025
MATH
HumanEval

Pros

    Cons

      Use cases

      API inference · Fine-tuning · Benchmarking

      AI models used

      Claude Mythos Preview

      FAQ

      How much does Claude Mythos Preview cost?

      Free tier

      Does Claude Mythos Preview have a free plan?

      Limited or no free tier

      Is there an API?

      Yes