Kimi K3.1 Pro’s October 2026 launch, featuring a 3-trillion-parameter MoE architecture and 1-million-token context, has propelled Moonshot AI to the top of multiple Humanity’s Last Exam leaderboards with tools at 70%, ahead of Claude Opus 5.5 and Fable 5.1 variants. This reflects strong gains in agentic reasoning, long-horizon coding, and tool-augmented knowledge retrieval on the 2,500-question expert benchmark. Moonshot intentionally filtered cyber-related training data to limit offensive capabilities while preserving general performance, with full open weights slated for November 4. Traders are monitoring whether community fine-tunes or further post-training push Kimi’s year-end peak higher amid competition from closed Anthropic and OpenAI models on no-tools HLE runs.