An X post by developer Harshith (@HarshithLucky3), reported by NokiaPowerUser on July 2, 2026, claims a leaked LMSYS Chatbot Arena screenshot shows an unreleased Google model tagged Gemini 3.5 Pro beating Anthropic's Claude Fable 5 High on a coding task generating an SVG of an isometric card-swiping machine. The claim is unverified, as no leaderboard link or Arena screenshot was published, and a separate leak reported by Geeky Gadgets claims the opposite, that Gemini 3.5 Pro lags Claude Fable 5 on coding and reasoning. Google has not confirmed testing an unreleased Gemini 3.5 Pro in the Arena, and Anthropic has not commented. Both Claude Fable 5 (released June 9, 2026) and Google's in-development Gemini 3.5 Pro are real, but this specific head-to-head result should be treated as an unverified, contested rumor.