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Who uses Claude Opus 5

1 person lists Claude Opus 5 as their model, 1 more use it alongside something else. Newest evidence: Andrej Karpathy, Aug 2, 2026.

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The harness these people run with Claude Opus 5.

Claude Code1
Andrej Karpathy
AI researcher and educator
HarnessClaude Code
ModelClaude Opus 5

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Also in the mix

  • Thariq Shihipar · Thariq recommends Opus 5 as a daily driver paired with Fable for planning, brainstorming, and hardest bugs.