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Anthropic's Claude Fable 5 shows power but also high cost and speed issues

Simon Willison has shared his initial impressions of Anthropic's Claude Fable 5, noting its significant capabilities and large model characteristics. He described the model as slow and expensive but highly effective at processing a wide range of tasks and data he presented to it. This suggests a powerful but resource-intensive AI system. AI

IMPACT Provides user perspective on a new model's performance, cost, and speed trade-offs.

RANK_REASON This is a personal impression and review of a model, not an official release or benchmark.

Read on Bluesky Jetstream — AI desk →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

COVERAGE [1]

  1. Bluesky Jetstream — AI desk TIER_1 English(EN) · simonwillison.net ·

    Wrote up my initial impressions of Claude Fable 5 - it has a big model smell: slow, expensive and capable of crunching through pretty much everything I threw at

    Wrote up my initial impressions of Claude Fable 5 - it has a big model smell: slow, expensive and capable of crunching through pretty much everything I threw at it simonwillison.net/2026/Jun/9/c...