tl;dr upcoming Anthropic models due to leak – Claude "Mythos", Capybara tier already in version 2, it'll have a context window of 1m
– Mythos comes in "fast" and regular thinking
– Opus 4.7 and Sonnet 4.8 already within the code
– Claude "buddy" also found, but not clear what it
Leak: Anthropic Claude Next-Generation Models 2026
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