Expired50% confidenceFactTime unknown
The Mythos product line supports an ultra-large context window of 1 million tokens and supports both a fast mode and a full reasoning mode.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Claude Code Source Code Leak: Full Roadmap for Opus 4.7 and Mythos 5 Exposed
bilibiliAI-seeker
Related Claims
UnverifiedClaude Mythos Preview is capable of maintaining coherent semantic understanding within a context window of hundreds of thousands of tokens.68% similarUnverifiedMythos Preview has security capabilities including automatic patch code generation, pre-release interception, penetration testing, and legacy code migration.66% similarUnverifiedThe batch run feature allows users to create tables containing large numbers of prompts, run all prompts across multiple models at once, and compare performance.59% similarUnverifiedThe context window of large language models has expanded from 4K tokens to the million-token scale, making long-horizon planning possible and allowing models to maintain a consistent understanding of the initial goal across sequences of dozens of tool-call steps.58% similarUnverified更大的上下文窗口意味着可以上传更完整的信息，模型看到的信息越完整推理质量越高58% similar
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