DeepSeek V4.1 Flash hands-on tests and comparisons

On the Artificial Analysis Cyber Index, GPT-6 Sol scores 69%, Kimi K3.1 Pro 64% and DeepSeek V4.1 Flash 1017 57%.

The author got DeepSeek V4.1 Flash running via Project Maya on a DDR4 64GB machine with two V100s and a 48GB RTX 4090, and posted the output.

Compares Kimi K3.1 Pro, Claude/GPT flagships and DeepSeek V4.1 Flash: official API ~200 tok/s, 230 in production, 96% cache hit rate, peak pricing around $0.3/$1.2, making it the practical daily pick.

In an Atomic Agent bug-fix test of Kimi K3.1 Pro, DeepSeek V4.1 Flash is noted completing the same task in 27 seconds for $0.016, versus 69 seconds and $0.37 for Opus 5.5.

The author is running 11 open-weight models, including DeepSeek V4.1 Flash, on a Mac mini for the same writing task, with the largest model spilling to SSD; results pending.

In the chart Kimi K3.1 Pro hits about 66% at far lower cost than Claude, DeepSeek V4.1 Flash has the lowest cost but a lower score, and Opus 5.5 and Sonnet 5.5 sit in the high-cost region.

The author ran Qwen3.8-27B and DeepSeek-V4.1-Flash across seven local configurations, from a 16GB RTX 5060 Ti to four DGX Sparks with 512GB combined memory, to have agents build interactive browser worlds.

In an OpenCode benchmark where four models built a 1,000-agent ant-colony foraging simulation, DeepSeek V4.1 Flash 1017 ranked first after static analysis, sandboxed runs and four-seed scoring.

A 37k-star dsh plugin offers keyless DeepSeek V4.1 Flash and Kimi K3 via an upstream free gateway and can generate Codex configs, but quotas are unstable, 429s occur, and chats may be logged.

A user checked the 12GB VRAM claim for running DeepSeek V4.1 Flash and found it also requires 96GB of system memory.

A user's subjective tier list puts DeepSeek V4.1 Flash 1017 near GPT-6.1 Sol, Kimi near GPT-6 Sol and Qwen 4 near Opus 5.5, with no benchmarks.

The author compresses abliterated DeepSeek V4.1 Flash 1017 from 510GB to ~100GB GGUF with lecore VQ so the 763B model runs locally on a 128GB laptop, citing a shipped, measured first build.