DeepSeek V4.1 Flash hands-on tests and comparisons

Tsinghua-incubated Fangcun Yueqian's 34-test independent audit finds V4.1 Flash-1017 violated rules in 48 of 400 simulated computer tasks (12%), up from 3 in the prior V4.1 Flash, and misjudged 32 of 69 real conversations as tests.

A user cites Cursor's chart showing V4.1 Flash at 47.7% top tier and $0.98 per task versus Opus 5.5 near 57% at over $13 per task, keeping Claude for coding but switching chores to the cheaper model.

The post says DeepSeek V4.1-Flash-1017 ranks first worldwide at 33.6T tokens per week, with Chinese models leading for 26 straight weeks and taking all top five spots.

A user complains GPT has become slow and says running DeepSeek V4.1 Flash 1017 on own hardware gives thousands of tokens per second, which they can no longer live without.

A user notes that DeepSeek V4.1 Flash 1017 is now available in Cursor and starts using it for coding, with a screenshot of the setup.

DeepSeek V4.1 Flash is now available in Cursor, costing $0.60–$0.98 per task on CursorBench, making it a budget-friendly option for everyday coding.

User runs V4.1 Flash 1017 in MXFP4 quantized form, pipeline-split across a MacBook Pro M5 Max and Mac Studio M5 Ultra, and plans to try the Muse Spark open release next.

A roundup of a small survey comparing DeepSeek V4.1 Flash coding experience in Codex, Claude Code, Pi and the official DSH harness, arguing the harness shapes prompt, context compaction and tool use.

A user asks for quantization and inference recipes to run DeepSeek V4.1 Flash 1017 locally on an M5 Ultra with 256GB of memory.

The author says DeepSeek 1017 is cheaper and better than Grok 4.7 on the same CursorBench, and questions Cursor subscriptions that no longer include non-Grok models.

A developer building a local music app found that DeepSeek V4.1 Flash plays Radiohead's Creep every single time it tests a feature.

Running DeepSeek-V4.1-Flash-1017 locally on an M5 Ultra 256GB with an MLX recipe, hitting 46.3 tok/s on long 1M-context text and 50 tok/s on normal prose.