Tech article
Livenerf: Has Opus 5.5 been nerfed yet?
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Hacker News | Sep 29, 2026 | bryan0
Automated excerpt
Right now v0 runs on a Claude Max subscription through headless Claude Code (claude -p), with no API key. Calibration keeps only the GPQA Diamond, MMLU-Pro and competition-math questions the model gets right sometimes. A control model (claude-opus-5) runs the panel's GPQA questions through the same harness every day.
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