Claude Fable 5 and Claude Mythos 5
…for example, previous Claude models struggled to play Pokémon FireRed even with harnesses that gave them additional helpful tools, but Fable 5 beat FireRed with a minimal, vision-only harness. Memory and…
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Harness design for long-running application development
…Contract criterion Evaluator finding Rectangle fill tool allows click-drag to fill a rectangular area with selected tile FAIL — Tool only places tiles at drag start/end points instead of filling the…
Anthropic Economic Index report: Learning curves
…This is caused, mechanically, by a rise in personal queries around sports, product comparisons, and home maintenance. The pattern is consistent with a standard “adoption curve” story, in which early-adopters favor…
Emotion concepts and their function in a large language model
…Anthropomorphic reasoning can also provide a useful baseline of comparison for understanding the ways in which models are not human-like, which has important consequences for AI alignment and safety. Toward models…
Project Fetch: Can Claude train a robot dog?
…Statistical comparisons of negative emotion and net emotional expression between teams were conducted using the non-parametric Mann-Whitney U test, which tests for differences in distributions between two independent groups without…
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