DeepSeek V4.1 Flash hands-on tests and comparisons

The post claims the one-person open-source ARTEX harness, paired with the Oct 17 V4.1 Flash 1017 release, powered breaches at Korean banks, ~20 Japanese firms and 2,250+ M365 tenants without zero-days.

Pulling OpenRouter endpoint prices, the author computes $0.22 vs $0.17 for the same batch, flags DeepSeek's peak/off-peak tiers and cache-hit fields, and argues for comparing cost per completed task.

IST Austria's GSQ-RCO quantization plus the Strata engine runs the 763B V4.1 Flash on consumer GPUs: ~5 tok/s on RTX 5070 and 8–10 tok/s on RTX 3060, but it needs 239GB of storage and plenty of RAM.

Kimi refunded 25% monthly quota after fast burn; the post cites an Oct 25 test where both models aced 3 scored tasks but Kimi cost $0.0607 vs DeepSeek V4.1 Flash's $0.0047, 12.8x more and ~3x slower.

The author says picking DeepSeek V4.1 Flash 1017 in OpenCode's free Motion feature yields motion videos near Claude Opus 5.5 quality, faster and at $0.17 per million tokens.

llama.cpp PR #31086 shares local benchmarks of the ~763B DeepSeek V4.1-Flash at UD-IQ2_XXS on a 9950X3D, RTX 5090 and 192GB RAM: ~174.4GB RAM, ~29.5GB VRAM, 324 tok/s prefill and 23.79 tok/s generation.

IST DASLab's per-tensor gradient-searched quantization of the 763B MoE comes in 1.75/2.00/2.25 bit tiers, runs on a 12GB card with Strata, is MIT-licensed, and has passed 410k downloads.

The author notes local V4.1 Flash in DSH nearly always turns on Agent Teams and uses far fewer subagents when it's off; the overhead forced them to disable it on a dual-Spark setup.

DeepSeek open-sourced DeepInfer on Oct 20, the production engine behind V4.1-Flash, with MegaAttention, MegaMoE and DSpark kernels; it targets multi-GPU clusters, not single consumer cards, and handles 155T tokens per day per cluster.

On a 64GB M5 Pro Mac mini, 11 open-weight models each rewrote the Gettysburg Address 1,000 times in a chain; DeepSeek V4.1 Flash (343GB) and GLM-5.3 Flash held above 90% similarity through all rounds, streaming from SSD at about 5.5 tok/s.

Benchmark of DeepSeek V4.1 Flash 1017, GLM-5.3 Flash and MiniMax M3.1 Flash across four DGX Spark units: GLM leads single-stream speed, DeepSeek leads 128K prefill at 6134 tok/s and scores 4.55 on ELYZA-tasks-100, with DeepSeek favored for agent and coding work.

A user calls 1017 quite good and describes a daily setup: Opus 5.5 on the Max 20x plan for most tasks, V4.1 Flash 1017 in DSH for sensitive work like cybersecurity research, and Qwen 3.7 Flash for news processing.