Users of Anthropic's Fable 5 model, particularly on the $100 Max plan, are encountering context window errors when utilizing the 'Max Thinking' feature with large payloads. Despite payloads estimated to be well within the advertised 1 million token context window, enabling 'Max Thinking' triggers these errors, while reducing the thinking budget allows the same prompts to process successfully. Hypotheses suggest this could be due to reasoning budget exhaustion or a dynamic UI limit that restricts input when 'Max Thinking' is active. AI
IMPACT Potential limitation in Anthropic's Fable 5 model's ability to handle large contexts with advanced reasoning features.
RANK_REASON User-reported issue with a specific feature of a released model.
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