Google’s October 28, 2026 announcement of Gemini 4 Carbon as its strongest frontier large language model immediately shaped trader sentiment, with the model posting a 69.1% score on Artificial Analysis’ new HLE-Diamond leaderboard—leading Claude Opus 5.5 by roughly 1.2 points in reasoning and knowledge subsets. This third-party result, emphasizing gains in long-horizon agentic tasks, secure coding, and cybersecurity benchmarks such as SEC-bench Pro, underpins near-certain implied probabilities for thresholds up to 65%. Carbon’s initial limited rollout to vetted cyber defenders via the Fairwind Program, followed by wider Gemini API availability on November 10, positions the model for official Humanity’s Last Exam evaluation at agi.safe.ai. Traders now watch for that formal debut score and any competitive shifts from rival labs before the July 2027 resolution.