DeepSeek V4.1 Flash hands-on tests and comparisons

A user criticizes benchmark gaming and says GLM 5.3 feels slower but smarter than DeepSeek V4.1 Flash 1017 in practice.

Kimi K3.1 Pro's blog shows DeepSeek V4.1 Flash at 42.3 in a TB 4.0 table but 33.8 on the same page's cost chart, citing different sources.

A remark that combining K3.1 Pro's capability with V4.1 Flash 1017's low price and speed in one model would upend the cost-performance landscape.

Nebius Token Factory now serves DeepSeek V4.1 Flash-1017 at a listed 738 tok/s for $0.30 input and $1.20 output per 1M tokens, with an Artificial Analysis intelligence index of 45, six points above the previous version.

InferX is making DeepSeek-V4.1 Flash-1017 free for the next few days, noting it is currently the most-used model on OpenRouter.

An independent tester planted 105 bugs across two production repos: DeepSeek V4.1 Flash 1017 fixed 42.7, edging out Opus 5.5 at 41.7, at roughly $1-2 in cost.

In a controlled test building a finance module, DeepSeek V4.1 Flash (max) scored about 80/100, close to Sonnet 5.5 High and on par with Grok 4.7 in code, at roughly ¥4 per task versus 1% of weekly Claude quota.

Official estimates for a $10 OpenCode Go plan per 5 hours: Kimi K3.1 Pro ~147 requests, DeepSeek V4.1 Flash ~34,670, MiniMax M3 ~3,200.

The author releases four abliterated builds quantized with a custom calibrated lecore VQ 11-bit format, improving perplexity from 3.62 to ~2.8 and top-1 agreement from 74.5% to ~81%, runnable only on a custom ds4 runtime.

The poster claims that on subscription pricing, Kimi K3.1 Pro costs more than 20 times DeepSeek V4.1 Flash 1017, and asks users to confirm.

On 105 planted bugs across two production repos, DeepSeek V4.1 Flash 1017 fixed 42.7, slightly above Opus 5.5's 41.7 and Kimi K3.1 Pro's 36, at roughly $1–2 cost.

The author is running a DeepSeek V4.1 Flash 1017 quant on Strix Halo 395+ at about 3.90 effective bpw, favoring quality with acceptable prefill, and targets over 4.00 bpw next.