DeepSeek V4.1 Flash hands-on tests and comparisons

Canopy Wave ran the same 3D motor prompt on both models: DeepSeek V4.1 Flash 1017 took 2m56s versus 9m58s for GPT-6 Astra.

Attack logs reviewed by Reuters show an executor named claudecode_deepseek-v4.1-flash, a ~10% task success rate, and about $50 of model cost per breached site.

A long post details OpenCode's limited-time free DeepSeek V4.1 Flash (about 200K context, zero-retention) and the DHS order for federal civilian agencies to remove DeepSeek products and third-party services built on it.

The author reran the public OfficeBench 300-task set against the previous build and reports build 1017 gains accuracy, finishes faster, and uses fewer tokens, lowering cost.

A user says Workbuddy's supply list on Tencent Cloud includes both first-party DeepSeek V4.1 Flash and an open-weight quantized version that appears to be degraded.

The author tested DeepSeek V4.1 Flash 1017 with dsh-purge and found it is not entirely naive about jailbreaks, showing early safety alignment.

Twenty requests consumed 10% of the 5-hour quota, and the user says it is now far pricier than opencode go and will switch unless fixed.

Arena lists the model first among open-source entries and 11th overall with a $0.20 median task cost.

Arena's 7.5K-session data puts V4.1-Flash-1017 at #11 overall and #1 open-source with a 5.1% net gain, zero tool-hallucination issues, and a $0.2 median cost per task, about 27% of Sol's.

A user built an explainer video with HTML/CSS, custom shaders and Three.js, saying V4.1 Flash produced it in one shot without a harness.

A user runs the same prompt and goal through DeepSeek V4.1 Flash and Opus 5.5, concluding Opus still clearly wins.

Amid DeepSeek's V4.1-Flash update, Ant Group's Richard Bian explains that flash denotes speed rather than small size and why the industry keeps shipping flash models.