Arena 解读：Reflection AI 的 Beam-1.0-501B-A23B 位列 Agent Arena 开源模型第 12 名
Arena 解读 Beam-1.0-501B-A23B 位列 Agent Arena 开源模型第 12 名
Reflection AI 的 Beam-1.0-501B-A23B 在 Agent Arena 开源权重模型中排名第 12，Net Improvement 为 -3.67%，是榜单上排名最高的美国开源模型，领先 Hy3、MiMo V2.5 Pro 和 MiniMax M3。
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!
来源：Arena · x.com