Rumor: Anthropic's Opus 5.5 training spend reportedly $10B, final run compute under 10% of it
teortaxesTex · x · 2026-11-11
Citing an unconfirmed report that Anthropic's lineup includes Opus 5.5, Sonnet 5.5 and Haiku 5.5, teortaxesTex breaks down the rumored $10B training expenditure for Opus 5.5: at long-term rental compute rates, the final training run likely accounts for well under 10% (possibly <5%), roughly 200B active parameters at 120T tokens. He argues data alone may have cost 4x the final-run compute, and quips that Sonnet and Haiku 5.5 "add little here". All figures are third-party speculation, not confirmed by Anthropic.
Related event: Leak Claims Anthropic's Opus 5.5 Cost $10B, Drawing Skepticism(3 posts)→
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