DeepSeek V4.1 Flash hands-on tests and comparisons

V4.1 Flash 1017 keeps $0.15/$0.60 per million tokens and MIT weights, now the top open model on ValsAI's index, though it still trails Opus 5 on the hardest coding tasks.

A Mac user connecting OpenCode to a local deepseek-v4.1-flash-1017 server says the experience is nearly indistinguishable from using Opus in Claude Code.

A Japanese post breaks down DeepSeek's open-sourced DeepInfer, citing efficient multi-GPU use, batched speculative verification and reduced recomputation as potential cost savers.

V4.1 Flash on TP4/SGLang with 1M context finished lyric sync and Canvas motion graphics in 12 turns with mostly aligned lyrics, while GLM-5.3-Flash generated faster but stayed off-sync after 24 turns.

A hands-on review of DeepInfer and deepseek-recipe that digs into the Q&A's production figures — 155 trillion tokens per day per cluster, $38 per GPU-hour revenue, ~100PiB KV cache — and finds fake think tags slip through when tokens arrive as text.

DeepSeek open-sourced DeepInfer, the in-house inference framework powering DeepSeek-V4.1-Flash at scale, aiming to lower compute costs for the community.

The llama.cpp Swap-MoE patch now runs DeepSeek-V4.1-Flash and Qwen3.8-Flash-Next on a 16GB-RAM CPU-only setup, with the latest version still under validation.

A user says Codex is working again and plans to run a Maya test on V100, evaluating both GLM 5.3 Flash and DeepSeek V4.1 Flash, with no results yet.

Arena reports the model first among open models in both agent and web-dev code arenas, based on 7,498 real sessions with 5.13% net improvement and a median cost of about $0.18 per task.

The 552B MIT-licensed MoE scores 77.0 on self-reported DeepSWE vs Opus 5's 74.0 but 42.3 vs 51.8 on Terminal-Bench 4.0; weights are ~552GB at 8-bit and ~280GB at 4-bit, fitting a 512GB Mac Studio.

Hands-on: EXL3-quantized V4.1 Flash on two DGX Sparks hits about 100 tok/s and gives detailed, solid review comments past 1B tokens; the author says switching is worth it.

A Korean-language summary of the official launch: web, app and API availability, weights on Hugging Face and ModelScope, Search & Fetch API at $0.75 per 1,000 calls, and free Claude Code/Codex server-side tool calls until November 1.