DeepSeek V4.1 Flash hands-on tests and comparisons

A Korean user remarks that DeepSeek V4.1 Flash's tone is identical to GPT-6 Astra and wonders how much of its data was distilled, a purely subjective observation.

A user calls DeepSeek V4.1-Flash 1017 five steps forward and two back: smart, but it overthinks and thinks instead of doing.

A hands-on demo where V4.1 Flash generates a procedural 3D scene with grass, lighting and wind simulation using only code, no Blender or Unreal.

A creator built an Alien-world Pandora 3D environment with Claude Sonnet 5.5 and argues Gemini 4 Argon and DeepSeek V4.1 Flash can't match Anthropic's models here.

A video runs the same 3D modelling prompt through DeepSeek V4.1 Flash and Claude Opus 5.5 to compare the two outputs side by side.

Developer Jazii ran the same prompt at max reasoning on both: Argon finished in 13 minutes for $1.20, DeepSeek took 50 minutes for $0.40, and quality was close enough that followers were asked to pick the better output.

A short Korean post claims GPT-5.6 Sol-level capability on a local PC with DeepSeek V4.1 Flash 1017, without any VRAM, quantization or speed details.

A user reports V4.1 Flash 1017 paired with DeepSeek Harness is very stable and completes most tasks in one pass, recommending official API or Workbuddy paid plans.

On one prompt Opus 5.5 delivers polished animation, sound and detail in 20 minutes for about $6, while V4.1 Flash takes about an hour and $0.23 to get surprisingly close with a few errors, a 26x cost gap.

The post cites ~$0.20 per DeepSWE task, $0.30/$1.20 per 1M tokens, 1M context, and a news-scoring agent built on the new search API, while noting it trails Opus 5 on Terminal-Bench and HLE.

User generated a launch animation for the new DeepSeek Harness with V4.1 Flash: visually nice but PPT-like, with creativity still behind Opus 5.5.

A video compares DeepSeek V4.1 Flash and GPT-6 Astra on one prompt; the author finds Astra slightly more realistic while DeepSeek's detail and final result are still impressive.