DeepSeek V4.1 Flash Max Tops Open Models in Agent Arena
DeepSeek-V4.1-Flash-20261017 (Max) has become the #1 open model in Agent Arena, ranking 11th overall. It achieves ~37% of GPT-6.1 Sol's performance improvement at only ~27% of the cost, significantly outperforming previous versions and competitor Kimi K3 in code generation and tool reliability.
Full Report
Arena.ai (@arena) · 2026-10-19 18
Big news: DeepSeek-V4.1-Flash-20261017 (Max) by @deepseek_ai is now the #1 open model in Agent Arena! It just landed at #11 overall with +5.1% net improvement across +7.5K real-world sessions.
This performance also reshapes the Agent Arena Pareto frontier! All models above V4.1-Flash 20261017 in performance are proprietary at much higher cost. At $0.20 median cost per task, that’s ~37% of GPT-6.1 Sol’s improvement for about 27% of the cost.
By signal, this release achieves:
- #8 in Confirmed Success with +11.5% (#1 open)
- #11 in Praise vs. Complaint with +5.9% (#1 open)
- #12 in Bash Reliability with +5.4% (#1 open)
- #13 in Steerability with +2.5% (#1 open)
- No issues with Tool Hallucination
Find more info on signals at the link in thread on Agent Arena.
Congrats to the @deepseek_ai team on this release!
↳ 引用 @arena (Arena.ai): Exciting news: DeepSeek-V4.1-Flash-20261017 (Max) by @deepseek_ai is now the #1 open model in Code Arena: WebDev, surpassing Kimi K3 (Max) at 10x lower cost!
Highlights:
- #1 open model, ahead of Kimi K3 (Max)
- #12 overall with 1670 pts, ahead of Claude Opus 5 (High) and within ~10 pts of GPT-6 Sol (Max)
- Shifts the Pareto frontier at 1.2 per million input/output tokens
- +52 pts vs. the previous DeepSeek-V4.1-Flash-20260910
Congrats to the @deepseek_ai team on another strong contribution to the open source ecosystem!
