On Friday I wrote that Opus 5.5 does my work and a Fable 5.2 agent checks it, because Fable is too token hungry for ever...

On Friday I wrote that Opus 5.5 does my work and a Fable 5.2 agent checks it, because Fable is too token hungry for everything. A new benchmark backs that up.Deepnote's Agent Initiative Benchmark tested 12 models as proactive agents in the Slack of a simulated company: help when needed, stay quiet when not.Fable 5.2 scores 4% higher than Opus 5.5, but makes twice the tool calls in twice the time, at $1.87 a task against $1.28. OpenAI's GPT-6 Astra and GPT-6.1 Sol top the list, Sol at $0.11 a task.The benchmark, dataset, and code are open source:https://deepnote.com/research/benchmark#AIAgents #ClaudeCode #LLM

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