Opus 5.5 tops Vals Index, first model to beat published reference on LM Training
burny_tech · x · 2026-09-23
Evaluator Vals AI reports Claude Opus 5.5 is now #1 on its Index, up 2 spots and 2 points from Opus 5, with Anthropic reclaiming the top three (GPT-6 Sol results coming soon). Notably, Opus 5.5 also tops the RSI Index and is the first model to beat the published reference on LM Training under Vals' protocol, a major step for long-horizon agentic work.
Related event: Opus 5.5 Tops Vals AI RSI Index, Full RSI Forecast Moved Up to July 2027(4 posts)→
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