LMArena reports Muse Spark 1.3 (Max) at #13 on Agent Arena with +4.2% net improvement across 8.7K+ real agentic sessions — a 17-rank climb from Muse Spark 1.2 (xHigh) at #30. Code, Work, and Chat all improved, with Code moving to #15 (+4.3%).
Arena.ai (@arena) says Meta Muse Spark 1.3 is now in the Arena: Agent Arena measures long-horizon agentic tasks with web search, filesystem, and terminal tools via causal tracing vs the average model; it is also in Code Arena WebDev/Text/Vision/Document. Voting is open and scores are coming soon.
Arena.ai says Anthropic Claude Fable 5.1 (Max) is #1 on Agent Arena across 6.7k+ real-world long-horizon agentic sessions with +15.8% net improvement, redrawing the price-performance frontier at a $4.14 median cost/task. Implicit praise-vs-complaint leads by +42.5%, confirmed success +22.4%, bash recovery +13.1%, and no tool hallucinations; GPT-6 Astra traces are still coming in.
LMArena (@arena) breaks down Gemini 3.8 Flash (High) vs 3.7 Flash (High) on Agent Arena: net improvement jumps from +0.84% (#32) to +5.94% (#14). Agent Arena scores relative gains on real long-horizon tasks with web, filesystem, and terminal tools. Among five signals, Praise vs Complaint improves most (+14.78% vs -1.60%); Confirmed Success and Bash Recovery also rise, while Steerability remains a relative weakness but better than 3.7.
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