DeepSeek-V4.1-Flash-20261017 has become the highest-ranked open model on Arena.ai’s Code Arena WebDev leaderboard. It displaced Kimi K3 (Max) with a score of 1670 points while costing roughly a tenth as much to run. Arena.ai posted the update on October 18, 2026. The model uses a Mixture-of-Experts architecture with 552 billion parameters and a context window reaching 1 million tokens. Its API is priced at $0.30 per million input tokens and $1.20 per million output tokens.
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