This Week in the Arena: Fable 5.2 takes #1, and Gemini 4 Hydrogen brings the speed.

• Claude Fable 5.2 (Max) by @AnthropicAI takes #1 in Agent Arena with +30.5% net improvement across 7.8k real-world sessions as of today.
• Gemini 4 Hydrogen (High) by @GoogleDeepMind launched as the fastest model in the Agent Arena top 10, with a typical step of 7.3 seconds.
• Muse Ember (Max) by @AIatMeta, Meta’s smallest model, debuted in Code Arena: WebDev. It’s #37 with 1609 points today, at a $0.03 median cost per task.
• Inkling 2 Small by @thinkymachines is now open weights and the #1 US open model in Code Arena: WebDev at 1647 points.
• MiniMax H3-Image by @MiniMax_AI is the #1 open model in Multi-Image Edit at 1365 (#11 overall), on par with Nano Banana 2 and Nano Banana Pro.
• ERNIE 5.5 Flash Preview by @Baidu_Inc is trending toward #2 open model in Code Arena: WebDev at 1668 points (AutoEval), with a 1M-token context window.

Open weights under Apache 2.0 are coming soon. youtube.com/live/FD3zZ5X0k4Q