FrontierBench

Anthropic released Claude Opus 5, replacing Opus 4.8 as the Opus-tier flagship with unchanged pricing at $5 per million input tokens and $25 per million output tokens. The model scored 43.3% on Fronti…

Z.ai's open-weight GLM 5.2 completed an agentic coding task in 17 minutes at $2.76, while Anthropic's Claude Fable 5 finished in 9 minutes at over $10, with comparable output quality. The open model c…