Claude Sonnet 5 – benchmark results

iLoveOncall

Half of the data is missing and the rest is inconsistent between different graphs and sections. Is the benchmark having Sonnet 5 generate the page and seeing how many hallucinations it has?

Tiberium

Seems like the model is incredibly inefficient at max reasoning, and even at high/xhigh it uses far more tokens than other models, including Gemini 3.5 Flash, GLM 5.2 and so on. GPT 5.5's efficiency in tokens is still unmatched. See also: https://cursor.com/cursorbench

atemerev

Yet another mediocre model. Mostly irrelevant among open weights alternatives. Fable wen.

datakan

I'm so sick of Anthropics usage caps and how their model devours tokens.

CSMastermind

Using Fable, pretty much every request hit some gate they had for no discernible reason. These provider-level rejections should be incorporated into benchmarks as 0s on the tasks since that's the experience you'll actually get using the model.

nsingh2

Cost per task is shockingly high. More expensive than Opus 4.8, second in place to Fable. Cost per task data is only available for max effort though, might just be very inefficient at that effort level.

DrProtic

I feel like they repackaged Opus, slightly nerfed it, and reduced price per token. A release just to have a headline while Fable situation is getting resolved.