DeepSeek V4.1 Flash hands-on tests and comparisons

DeepSeek open-sourced DeepInfer, the inference framework serving V4.1 Flash, disclosing 155T tokens/day per cluster and $38/GPU-hour revenue, implying roughly 82–92% theoretical margin at $3–7/hour GPU cost.

A user compares DeepSeek V4.1 Flash 1017 running locally on one RTX 3090 with the Maya-S quant against the API on the same task: 25k tokens, low thinking effort and about an hour, slow but surprisingly good output.

Alongside the DeepInfer release, a breakdown of DeepSeek's self-reported ~$38 revenue per GPU-hour versus $2–4 rental, attributing the 10–19x spread to speculative decoding, prefill cuts and in-house kernels.

A Japanese post notes the API's low-cost deepseek-flash tier now runs the October 17 V4.1-Flash-1017 release; DeepSeek's own tests show it beating Claude Opus 5 on coding but trailing on terminal tasks.

DeepSeek has open-sourced its DeepInfer inference engine, currently mainly supporting V4.1 Flash with benchmark scripts, though production components like KV cache management and load balancing must be built by users.

An open-source plugin claims no-signup, no-API-key access to DeepSeek V4.1 Flash, Kimi K3 and others, with auto model switching and Codex/Claude Code integration.

An indie developer plugs DeepSeek V4.1 Flash-1017 and MiniMax M3.1 Flash into Claude Code and compares coding accuracy and token bills on the same real API-fix task.

In a harness-free comparison using only prompts and structured data, GPT-6 Luna came out on top over DeepSeek V4.1 Flash 1017 and Claude Haiku 5.5.

B.AI advertises a 40% discount on DeepSeek-V4.1-Flash-1017 from Oct 22, citing gains on 11 benchmarks and 77.0% on DeepSWE v1.1, alongside Qwen3.8-Flash and GLM-5.3-Flash discounts.

A promotional post lists three discounted models, with DeepSeek-V4.1-Flash-1017 at 40% off, 763B parameters, a 1M-token context window and interleaved image-text input.

B.AI says a new discount matrix goes live Oct 22 at 17:00 SGT, with DeepSeek-V4.1-Flash-1017 at 40% off and unchanged base pricing, pitched at coding and agent workflows.

A promotional post says DeepSeek-V4.1-Flash-1017 improves on 11 benchmarks and gains agent and coding ability, with a 40% discount from Oct 22 alongside GLM and Qwen discounts.