Exciting news from Agent Arena: Hy4 by @TencentHunyuan just landed #14 overall. Currently proprietary, but once its weights are released it will tie with Kimi K3.1 Pro for #1 among open models!

Across +8.5K real-world, long-horizon agentic sessions from our global community of users, Hy4 delivers +4.7% net improvement and joins the Agent Arena Pareto frontier. At $0.55/task, Hy4 costs about 62% less than Kimi K3.1 Pro (Max) at $1.46/task, and the two models’ scores are within 1 percentage point.

This release is a +3.6 percentage pt improvement from Hy4 preview at #25 with +1.1%. In fact, Hy4 improved across all key signals:
- Confirmed Success (explicit “yes, that worked” from users): #11 with +8.7% (up from #16 with +4.9%)
- Praise vs Complaint (sentiment in user reactions): #18 with +3.8% (up from #24 with +1%)
- Steerability (responding to user corrections): #14 with +5.7% (up from #27 with +0.21%)
- Bash Reliability (successful shell commands): #20 with +6.2% (up from #41 with -3.1%)

Congrats to the @TencentHunyuan team on this release!