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Rerunning Mario and Mickey Mouse tests to check if Opus 5.5 was nerfed

After hearing claims that Opus 5.5 might have been nerfed, the author reran the same Mario and Mickey Mouse tests with the September 30th and October 3rd versions using identical prompts.

Luckey Faraday
@luckeyfaradayArchived 2026.10.03Originally posted 2026.10.03
Luckey Faraday @luckeyfaradayOriginally posted 2026.10.03
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People are saying Opus 5.5 might have been nerfed. So I reran the exact same Mario and Mickey Mouse tests with September 30th Opus 5.5 vs. October 3rd Opus 5.5. Same prompts, just three days apart. What do you think? Is Opus 5.5 nerfed?

x.com/luckeyfaraday/status/2106191762473509131Archived 2026.10.03 10:07