Using Claude Subscriptions for Evals Likely Violates Anthropic's ToS, Bench Author Says

JoshPurtell · x · 2026-11-07

Bench author Josh Purtell explains his leaderboard's design: comprehensive OSS coverage, but the closed reference only runs OpenAI models via a Codex subscription, plus Muse Spark 1.2 to show how bad Muse open is despite being promised as 1.2 OSS. He estimates 90% of people avoid using Claude subscriptions for evals since it likely violates Anthropic's draconian ToS—even though he suspects Anthropic's models would score well.

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