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lmarena.ai@lmarena_ai
Beam-1.0-501B-A23B just landed in the Agent Arena. With this release, @Reflection_AI is now in the Agent Arena top 15 labs! Among US labs, Beam-1.0-501B-A23B is #6 , and overall is #13 . Congrats to the team at @Reflection_AI on this contribution to the open-source ecosystem! Arena.ai @arena Exciting news: Beam-1.0-501B-A23B by @Reflection_AI just landed #12 among open weight models in Agent Arena with -3.67% Net Improvement, and #22 among open in Code Arena: WebDev with 1438 pts. It’s also fully open under Apache 2.0. On the Agent Arena leaderboard, Beam 1.0 is the top-ranked US model among open models, landing at #12 . That puts it ahead of Hy3, MiMo V2.5 Pro and MiniMax M3. Its margin of error is wide (±3.84% on Net Improvement), so it’s statistically closer to the two Qwen3.8 models just above it than its rank suggests. On Code Arena: WebDev, 24 of the top 25 open models come from Chinese labs. The one exception is Reflection’s Beam 1.0 (Apache 2.0). It ranks #22 among open models, which makes it the top US open model on the board, just ahead of Kimi K2.5 Thinking and GLM-5. Congrats to the @Reflection_AI team on this solid open weights release! 🔗 View Quoted Tweet
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2111162775007559685
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---
tweet_id: "2111162775007559685"
author: "lmarena_ai"
published_at: "2026-10-16T18:30:03+00:00"
source_url: "https://x.com/arena/status/2111162775007559685"
---

Beam-1.0-501B-A23B just landed in the Agent Arena. With this release, [@Reflection\_AI](https://x.com/Reflection_AI) is now in the Agent Arena top 15 labs!  
  
Among US labs, Beam-1.0-501B-A23B is #6, and overall is #13.  
  
Congrats to the team at [@Reflection\_AI](https://x.com/Reflection_AI) on this contribution to the open-source ecosystem!

![Tweet Image](https://pbs.twimg.com/media/HUxbB8lXAAAcqXV.jpg)

![Arena.ai](https://pbs.twimg.com/profile_images/2017015061454438400/iNKfXZ_I_normal.jpg)

Arena.ai@arena

Exciting news: Beam-1.0-501B-A23B by [@Reflection\_AI](https://x.com/Reflection_AI) just landed #12 among open weight models in Agent Arena with -3.67% Net Improvement, and #22 among open in Code Arena: WebDev with 1438 pts. It’s also fully open under Apache 2.0.  
  
On the Agent Arena leaderboard, Beam 1.0 is the top-ranked US model among open models, landing at #12. That puts it ahead of Hy3, MiMo V2.5 Pro and MiniMax M3. Its margin of error is wide (±3.84% on Net Improvement), so it’s statistically closer to the two Qwen3.8 models just above it than its rank suggests.  
  
On Code Arena: WebDev, 24 of the top 25 open models come from Chinese labs. The one exception is Reflection’s Beam 1.0 (Apache 2.0). It ranks #22 among open models, which makes it the top US open model on the board, just ahead of Kimi K2.5 Thinking and GLM-5.  
  
Congrats to the [@Reflection\_AI](https://x.com/Reflection_AI) team on this solid open weights release!

![Tweet Image](https://pbs.twimg.com/media/HUwObk3bIAAPoRj.jpg)

[🔗 View Quoted Tweet](https://x.com/arena/status/2111084024336884097)