A 65-day analysis claims 39% of Fable 5 Claude Code calls receive zero thinking tokens, with a median of 123
An X post by @Lon analyzing 43,000+ Claude Code invocations over 65 days reports that 39% of Fable 5 calls get zero thinking tokens and the median invocation gets 123, against benchmark configurations using 16K-128K, and that August saw an 18-50% drop in thinking budget versus July with median thinking at literal zero for roughly a week around Aug 22. The claim that matters: score per thinking token is still climbing at 128K, so the ceiling is a delivery decision rather than a capability limit. This is a single-source analysis I could not independently verify; the 430-upvote r/ClaudeAI thread is corroborating sentiment, not corroborating measurement, and one commenter notes some users simply have thinking disabled in settings.
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