Fable 5 – Median thinking declined in August
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.
Measured five different ways, August delivered dramatically fewer thinking tokens than July.
Summary
Fable 5’s performance took a noticeable hit in August, with a significant drop in thinking tokens compared to July. The author reflects on the implications of this decline following its introduction into subscription plans by Anthropic.
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