DeepSeek V4.1 Flash hands-on tests and comparisons

The post says this Flash model matches or exceeds GPT-5.6 Sol on several benchmarks and nears Opus 5 on some agent and coding tasks, with off-peak uncached input at $0.15/M and output at $0.60/M.

An AI fingerprint detector classified the newly released V4.1 Flash 1017 as GPT-6 Astra, which the poster ties jokingly to Anthropic's distillation crackdown.

A user notes V4.1 Flash's off-peak $0.15/$0.60 pricing, matching or beating Sol on some agentic boards, plus near-unlimited free access on platforms like OpenCode, questioning OpenAI and Anthropic's expensive gated frontier models.

A reply notes V4.1 Flash scores 77% on DeepSWE at about 20 cents per task versus $1+ for Claude/GPT-6, with MIT-licensed open weights as a bonus.

A recursive-loop SVG retest of V4.1 Flash-1017 with a "realistic" prompt shows more detailed legs and gripping claws than Opus 5.5, though motion stays stiff and cartoonish; cost about $1.50.

The author argues V4.1 Flash wins for most developers with cheap API, faster and shorter responses, self-hosting, and high-volume agent pipelines, while Gemini 4 Argon mainly suits Google-ecosystem enterprises.

DeepSWE v1.1 Pass@1 hits 77.0% at roughly $0.15–0.2 per task versus Opus 5's ~74% at over $10, with Terminal-Bench 4.0 at 42.3 and Automation-Bench at 60.5; the point is cheaper agent retries.

A user reports translating an entire site from Chinese to English in DeepSeek Harness with V4.1-Flash-1017, no skills or MCP, one natural-language prompt, no debugging, for ¥1.

Links to the October 17 official announcement plus the DeepSeek-V4.1-Flash-1017 model cards on Hugging Face and ModelScope.

A post collecting the Hugging Face and ModelScope download links for DeepSeek-V4.1-Flash-1017 open weights plus the official Search & Fetch API guide.

A one-prompt plus reference-image rebuild of a 3D globe dashboard in DeepSeek Harness matched the reference on texture, lighting, glass panels and Three.js interactions, kept the logo undistorted, and added day/night modes unprompted; the author rates its taste and detail on par with Opus 5.5.

A user tested daily conversation and idea-generation QA: instruction following improved, but answers felt rigid and hollow, possibly because more frameworks and workflows were baked in; coding tests pending.