DeepSeek V4.1 Flash hands-on tests and comparisons

The author relays a fingerprint test claiming V4.1-Flash-1017 behaves like 6-astra, argues fingerprints cannot prove a wrapper, and calls for comparing the MIT-licensed weights instead.

Hands-on: V4.1 Flash-1017 recreates the Fable 5.5-style painting time-travel video with the right style and feel, only slightly behind Gemini 4 Argon, mainly in output time.

Official release notes claim gains over the previous Flash, with Terminal-Bench 4.0 rising from 31.2 to 42.3 while task time and output length shrink; weights are MIT-licensed and Search/Fetch costs $0.75 per 1,000 successful requests, free via supported tool paths until Nov 1.

A video evaluates the 1017 release across pricing, coding benchmarks and same-prompt writing tests, noting that beyond low cost, reliability, long-task performance and model division of labor matter too.

The poster says they did not use V4.1 Flash for subagents, citing an existing GPT-6.1 Sol xhigh subscription and concerns from Artificial Analysis hallucination benchmarks.

A Chinese-language hands-on reports animation quality second only to Claude, though fingerprinting flags 84.66% as GPT-6 Astra; the author argues cost matters most at ¥28 per 500M tokens.

Developer kco's private coding test set gives V4.1 Flash 1017 96.02%, tying Haiku 5.5 Think=High and trailing Sonnet 5.5's 98.25%, with two URL-validation cases failing; official figures show 77.0% on DeepSWE at about $0.20 per task.

A roundup of r/LocalLLaMA chatter: the API id is deepseek-flash running native FP8, far faster than V4.0-0731 and solid for low-thinking routine automation, but users worry about regressions in complex coding and tool calls and suggest pairing it with a stronger model.

The author renders the same real-time 3D castle above the clouds with Claude Opus 5.5 and DeepSeek V4.1 Flash across six identical tour stops for viewers to compare.

A user calculates from the JSON credit log that the ¥70/month WorkBuddy plan yields roughly 219M V4.1 Flash tokens, worth about ¥285.

The author generated a 10-second frame-by-frame hand-drawn motion-graphics short with V4.1 Flash 1017 in 37 minutes, saying it feels close to Opus 5.5, and shared the prompt and reference repo.

The user notes V4.1 Flash is a 510GB-class open-weight model, worries about misuse if guardrails can be removed, and says a lighter version would sharply cut local inference compute.