DeepSeek V4.1 Flash hands-on tests and comparisons

Tester says V4.1 Flash nearly saturates most web vulnerability tasks and one-shots kernel and v8 n-days, though complex exploits still trail GPT-5.6 Sol.

A user tested DeepSeek V4.1 Flash through OpenCode Go and measured roughly 140–180 TPS, staying under 200 and running somewhat slower than the official API.

A YouTube hands-on video claims the locally run DeepSeek V4.1 Flash 1017 feels close to frontier models, without concrete benchmark or speed numbers in the post.

A user reports Qoder's free DeepSeek V4.1 Flash access has a daily cap; once used up, the next day's requests get queued at lower priority while a fresh account runs fine.

A user says Fireworks-hosted DeepSeek V4.1 Flash 1017 reaches 1521 tokens per second, roughly seven times faster than Opus 5.5.

DeepSeek released DeepInfer, its production inference framework supporting V4.1 Flash with MoE expert parallelism, DSpark speculative decoding and overlapped scheduling on NVIDIA SM100 and Ascend 950, currently offline-only.

Citing the DualBench100 accounting benchmark, the user notes V4.1 Flash 1017 scores only 82.2% versus 84.2% for the older version, while Gemini 4 Argon hits 91.1% and GLM-5.3 Flash 88.1%.

A community project, vLLM-Moet, rewrites compute and communication to fit DeepSeek-V4.1-Flash-1017 on four RTX PRO 6000 cards, with the author measuring 641 tok/s single-stream code and 253–265 tok/s prose, about 1.5x faster than the official image, requiring ~330GB shared memory and no third-party reproduction yet.

A developer traces two failure causes on a dual DGX Spark setup: concurrent long prompts OOM rank 0, which tokenizes alone and holds ~1.4GB per 1M-token request, and when one rank dies the other hangs forever; their branch detects the broken pair and restarts both ranks, noticing a dead rank in about 1s and recovering in under a minute.

A user reports V4.1 Flash 1017 reaching about 1521 tok/s on Fireworks Ultrafast, generating a playable Tetris in 11 seconds and claiming roughly 7x the speed of Opus 5.5.

Running DeepSeek V4.1 Flash across four DGX Sparks in a QSFP ring with TP4, the author finds the SGLang recipe better than NVIDIA Flare for coding agents.

Four models built an interactive 3D Halloween HTML scene from one prompt; GPT-6 Astra impressed most at $1.80, while DeepSeek V4.1 Flash offered the best quality-cost balance at just $1.08.