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  3. Arena

    Reflection AI open-sources Beam-1.0-501B-A23B, ranked 12th on the Agent Arena open-source leaderboard

    Reflection AI has released the open-source model Beam-1.0-501B-A23B under the Apache 2.0 license. It ranks 12th among open-weight models on Agent Arena with a Net Improvement of -3.67%, and ranks 22nd on the Code Arena: WebDev open-source leaderboard with a score of 1438. On the Agent Arena leaderboard it is the highest-ranked US open-source model, ahead of Hy3, MiMo V2.5 Pro and MiniMax M3, but its Net Improvement error margin reaches ±3.84%, making it statistically closer to the two Qwen3.8 models above it. Of the top 25 open-source models on Code Arena: WebDev, 24 come from Chinese labs; Beam 1.0 is the only exception and the highest-ranked US open-source model on that leaderboard, slightly ahead of Kimi K2.5 Thinking and GLM-5.

    Reflection AI has released the open-source model Beam-1.0-501B-A23B under the Apache 2.0 license. It ranks 12th among open-weight models on Agent Arena with a Net Improvement of -3.67%, and ranks 22nd on the Code Arena: WebDev open-source leaderboard with a score of 1438. On the Agent Arena leaderboard it is the highest-ranked US open-source model, ahead of Hy3, MiMo V2.5 Pro and MiniMax M3, but its Net Improvement error margin reaches ±3.84%, making it statistically closer to the two Qwen3.8 mo

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