Fable 5 – Median thinking declined in August
Summary
After Anthropic made Fable 5 permanently available in subscription plans, an observer reported a large drop in its performance, with fewer thinking tokens generated in August compared to July.
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Cached at: 09/21/26, 06:43 PM
After Anthropic made Fable 5 permanently available in subscription plans, I noticed a large drop in performance. The model felt dumber, and I couldn’t explain why.
Measured five different ways, August delivered dramatically fewer thinking tokens than July. https://t.co/irT7y7KkNJ
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