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DeepSeek-V4.1-Flash-20261017 (Max) Tops Arena Open Model Leaderboard

Arena announced that DeepSeek-V4.1-Flash-20261017 (Max) has entered Arena and ranks first among open models on both the Agent Arena and Code Arena: WebDev leaderboards. The news was released by Arena on October 21, 2026, and is the latest verifiable development to date. Arena also noted that the 3D world generated by the model and more detailed ranking information can be viewed in the related post. Apart from this top-ranking result, there are no other subsequent developments with qualified factual evidence.

DeepSeek-V4.1-Flash-20261017 (Max) Tops the Arena Open Model Leaderboard

Arena announced that DeepSeek-V4.1-Flash-20261017 (Max) has entered Arena and ranks first among open models on both the Agent Arena and Code Arena: WebDev leaderboards. The news was released by Arena on October 21, 2026, and is the latest verifiable development to date. Arena also noted that the 3D world generated by the model and more detailed ranking information can be viewed in the related post. Apart from this top-ranking result, there are no other subsequent developments with qualified factual evidence.

View story:DeepSeek-V4.1-Flash-20261017 (Max) Tops Arena Open Model Leaderboard

DeepSeek releases DeepSeek-V4.1-Flash-1017

On October 17, 2026, DeepSeek released DeepSeek-V4.1-Flash-1017, which the company says delivers stronger benchmark performance, faster task completion, and shorter outputs, achieving a Pareto improvement in performance and cost; it is now available on the official website, App, and API, and the model also launched on OpenRouter the same day. The company also announced that the Search and Fetch APIs are open to everyone, priced at $0.75 per 1,000 calls per endpoint, with calls made through server-side tools in DeepSeek Harness, Claude Code, and Codex temporarily free, and billing starting at 16:00 UTC on October 31, 2026. On October 17, Thomas Wolf commented that DeepSeek called this a "minor update," yet Terminal-Bench 4.0 rose from 31.2 to 42.3. On October 19, Arena announced that the model, with a score of 1670, became the highest-ranked open-source model on Code Arena: WebDev. On October 20, OpenCode updated it to version 1017 in Go and Free; Unsloth released a GGUF that can run locally, with the 1-bit quantized version retaining about 88.2% accuracy and shrinking in size from 508GB to 250GB; Arena then announced that it topped the Agent Arena open-source model leaderboard.

DeepSeek releases DeepSeek-V4.1-Flash-1017

On October 17, 2026, DeepSeek released DeepSeek-V4.1-Flash-1017, which the company says delivers stronger benchmark performance, faster task completion, and shorter outputs, achieving a Pareto improvement in performance and cost; it is now available on the official website, App, and API, and the model also launched on OpenRouter the same day. The company also announced that the Search and Fetch APIs are open to everyone, priced at $0.75 per 1,000 calls per endpoint, with calls made through server-side tools in DeepSeek Harness, Claude Code, and Codex temporarily free, and billing starting at 16:00 UTC on October 31, 2026. On October 17, Thomas Wolf commented that DeepSeek called this a "minor update," yet Terminal-Bench 4.0 rose from 31.2 to 42.3. On October 19, Arena announced that the model, with a score of 1670, became the highest-ranked open-source model on Code Arena: WebDev. On October 20, OpenCode updated it to version 1017 in Go and Free; Unsloth released a GGUF that can run locally, with the 1-bit quantized version retaining about 88.2% accuracy and shrinking in size from 508GB to 250GB; Arena then announced that it topped the Agent Arena open-source model leaderboard.

View story:DeepSeek releases DeepSeek-V4.1-Flash-1017