• LLM — A large language model — the neural network behind tools like Claude and ChatGPT, trained on huge amounts of text to predict what comes next.
• benchmark — A standard public test set for comparing AI models — the shared scoreboards behind every "model X beats model Y" claim.

Within-family comparisons at different reasoning efforts are the useful signal now, and Fable 5.1's low and medium settings appear to record no reasoning traces, which matters when choosing an effort level against cost.

• postFable 5.1 leads the index and still costs 20% more per taskArtificial Analysis
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• postAnthropic ships Fable 5.1 with a 75% cache read price cutClaude

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