• If you're tuning reasoning-effort settings for coding agents, this benchmark shows Medium effort captures nearly all the resolve-rate gains at a fraction of the cost of XHigh, and that Opus 5 at max effort is beaten on every metric by Grok 4.5, GPT-5.6 Sol, and Fable 5.
• AlphaSignal ran Claude Opus 5 through 260 debugging attempts across four effort levels (Low, Medium, High, XHigh) and found that raising effort from Low to XHigh improved resolve rate by only 4.7 points (93.8% to 98.5%) while increasing cost per fix by 477% and token use by 635%.
• The analysis concludes Medium effort is the practical sweet spot and shows Opus 5 at XHigh was matched or beaten on reliability, cost, and latency by Grok 4.5, GPT-5.6 Sol, and Fable 5.

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