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the four questions about Registrai, gpt-5 asked which Arc was meant instead of answering in 51 of 123 answers (41%). claude-sonnet-5-5 did so once."},{"text":"gemini-2.5-flash sometimes answered about a different Arc: the Arc browser, the game ARC Raiders, the Mathews ARC bow, ArcLight Capital and Arbitrum."},{"text":"Two of the explainers cited most for questions about the chain were out of date on the day of the run: one says Arc is on testnet only, the other that it is not yet on mainnet. Arc mainnet launched on 2026-09-16.","sources":[{"url":"https://coinbureau.com/education/what-is-arc-circle-stablechain","title":"Coin Bureau, What is Arc (4 Apr 2026)"},{"url":"https://bitcoinfoundation.org/news/uncategorised/circle-blockchain-arc","title":"Bitcoin Foundation, Circle blockchain Arc (9 Aug 2026)"}]},{"text":"On five data questions (USDC on Arc, daily transactions, active wallets, the app with the most stablecoin payments, daily stablecoin volume), claude-sonnet-5-5 repeatedly said it found no current figure."}]}