Rumor: Anthropic to release Fable 5.1, months ahead of rivals

A leak suggests Anthropic will release its Fable 5.1 model by month's end, while OpenAI's Astra remains unreleased and Google's Gemini 4 is still in post-training, potentially putting Anthropic 3-4 months ahead. The model is reportedly already used internally for research.

2026-08-27 ~ 2026-08-27 · 2 related posts