Fable 5.2 Tops Agent Arena as Gemini 4 Hydrogen Leads on Speed
Original title: This Week in the Arena: Fable 5.2 takes #1, and Gemini 4 Hydrogen brings the speed.
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Arena.ai's weekly roundup shows Anthropic's Claude Fable 5.2 taking first place in Agent Arena with a 30.5% net improvement across 7.8k real-world sessions, while Google DeepMind's Gemini 4 Hydrogen becomes the fastest top-10 model at a typical 7.3 seconds per step. Meta's smallest model Muse Ember debuted in Code Arena WebDev, Thinky Machines' Inkling 2 Small leads US open models, and Baidu's ERNIE 5.5 Flash Preview nears second among open models with a 1M-token context.
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Arena.ai (@arena) · 2026-11-13 20
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.