DeepSeek V4 Flash
DeepSeek's fast, low-cost open-weight large language model, offered via API and for local use.
HN commenters like it as a fast, very cheap daily driver for coding12345, often using it to implement plans written by pricier frontier models.6789 The most common caveat is that it trails frontier models on harder design, explanation and debugging work10111213, and its chattiness can eat into the per-token savings.1415
Why people recommend it
Low cost · 3
Heavy all-day use costs only a few dollars, far below frontier subscriptions or APIs.
“I use DS 4.1 flash it all the time, i struggle to spend more than 1 euro per day on it”
“Its a daily driver for sure. not even worth considering anything else”
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“V4.1 is really very close to SOTA in my books”
Speed · 3
Users report roughly 150 to 200 tokens per second and call it faster than Opus or GPT models.
“the DeepSeek 4.1 models are currently the ultimate cost-effective model the rest have to match with”
“What blows me away about this model is it's speed.”
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“you can spin a bunch of DeepSeek Flash agents and each will run at ~150-200t/s”
Coding ability · 3
Handles daily work in Python, C++, CUDA, Rust and Svelte, and some put it close to state-of-the-art models.
“I use Deepseek v4.1 Flash to make progress on multiple projects (Python, C++, CUDA) every single day.”
“I’ve been very pleased with DS 4.1 flash.”
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“I've come to forget I was not using Claude, it's a really good model”
Implementation workhorse · 3
Frequently paired with a frontier planner model, with Flash doing the implementation and sub-agent work.
“I love DS flash, it is an amazing workhorse to implement plans created by more robust models”
“We use Claude Fable to plan, and DeepSeek 4.1 Flash (hosted on DeepInfra) for everything else. Very cost effective.”
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“Coding is handled by Haiku 5.5/GPT 6 Luna/DeepSeek v4.1 Flash.”
Debugging · 2
Credited with quickly finding bugs, including in difficult brownfield code.
“I've been using DS 4.1 Flash for a while now as my main workhorse. It's amazing.”
Local running · 3
Some run quantized versions locally, such as on a 128GB Mac Studio, with decent coherence.
“I use DwarfStar DeekSeek V4 Flash on my Mac Studio with 128gb of RAM and it's pretty good - decent TPS and coding ability.”
“Then DeepSeek 4 Flash came out and suddenly it was like... Ok. You can run a local model that keeps coherence, and is decent technically.”
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“I use Deepseek V4 flash 0731 Q8 quantisation from unsolth with reasoning turned off on a local server for quick easy tasks”
Caveats and dissent
Below frontier · 3
Some report weaker solutions than Opus or Sol, rabbit holes, false assertions, or overall disappointing results.
“I have been using DeepSeek 4.1 flash intensively for over a month. If I run it all day long it costs $1-2. Its fast.”
“they're more likely to go down rabbit holes, confidently assert falsehoods, or fix bugs with changes to my test harness rather than my code.”
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“DeepSeek 4.1 Flash kindof sucks.”
Token verbosity · 2
It can be chatty, using about 3x the tokens of Sol per task, so cost per task matters more than token price.
“I do think it's the most viable alternative I've seen so far”
“Deepseek v4.1 Flash is still the best value model and capable enough for almost everything I need to do.”
Poor explanations · 2
Described as bad at grilling sessions and explaining technical decisions, and annoying to chat with in some roles.
“I have been using DeepSeek 4.1 flash intensively for over a month. If I run it all day long it costs $1-2. Its fast.”
“I really like DS Flash too, it can just be /really/ annoying in some roles”
Provider variance · 2
Inference quality and configuration reportedly vary between hosting providers and quantizations.
“I recommend trying deepseek v4.1 flash from together.ai”
“The value you get is claimed to be 80$ in DeepSeek v4.1 Flash API value.”
Hardware demands · 2
Running it locally at good quality needs expensive hardware.
“Running DeepSeek 4.1 Flash at FP4 is going to need at least a 10-15k machine. I'd consider that near frontier level.”
“I use DwarfStar DeekSeek V4 Flash on my Mac Studio with 128gb of RAM and it's pretty good - decent TPS and coding ability.”
Often compared with
2 moved from Claude Opus to DeepSeek V4 FlashGLM34 comments mention both
2 moved from GLM to DeepSeek V4 Flash
6 moved from Claude to DeepSeek V4 Flash
2 moved from Kimi to DeepSeek V4 Flash
1 moved from DeepSeek V4 Flash to Kimi
1 moved from DeepSeek to DeepSeek V4 FlashPi25 comments mention bothGLM Flash20 comments mention both
1 moved from GLM Flash to DeepSeek V4 Flash
1 moved from DeepSeek V4 Flash to GLM Flash
Who recommends it in their own words
Threads where it came up
- Why isn't the industry freaking out about DeepSeek 4.1 Flash? 20 mentions
- Ask HN: What default model do you use and why? 14 mentions
- DeepSeek V4 Flash 0731 11 mentions
- DeepSeek-V4-Flash Update 7 mentions
- DeepSeek-v4.1-Flash-1017 6 mentions
- Ask HN: Has anyone replaced Claude/GPT with a local model for daily coding? 6 mentions
Also written as DeepSeek Flash, DeepSeek V4.1 Flash, DeepSeek 4.1 Flash, DeepSeek Flash 4.1. Data: deepseek-v4-flash.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 48
“We use Mistral Large 4, GLM 5.3 Flash and DeepSeek v4.1 Flash 1017 through their API”
“I'm still using DS-flash - it beats frontier model on speed and cost keeping good enough code quality.”
“Deepseek 4.1 Flash is turning out to be a sweet spot for me; it's cheap and blazing fast”
“right now that's DeepSeek 4.1 Flash 1017”
“you can spin a bunch of DeepSeek Flash agents and each will run at ~150-200t/s”
“I use DeepSeek flash API as a driver most of the time.”
“V4.1 Flash 1017 is my daily driver cloud model.”
“I use Deepseek v4.1 Flash to make progress on multiple projects (Python, C++, CUDA) every single day.”
“deepseek flash variants, work horse.”
“Gemini Flash 3.8, DeepSeek Flash, and Luna are still up there as favorites”
“I have been using DS Flash 4.1 pretty heavily. It runs for hours and hours and is pretty cheap.”
“I recommend trying deepseek v4.1 flash from together.ai”
“Deepseek-4.1 Flash 1017”
“It is terribly fast! And smart. And cheap.”
“Coding is handled by Haiku 5.5/GPT 6 Luna/DeepSeek v4.1 Flash.”
“The value you get is claimed to be 80$ in DeepSeek v4.1 Flash API value.”
“Deepseek 4.1 Flash in OpenCode.”
“I use DS-4.1-Flash a lot but find it often gets caught up in long thinking runs.”
“I really like DS Flash too, it can just be /really/ annoying in some roles”
“I have a $20/month OpenAI subscription that I supplement with DeepSeek V4.1 Flash”
“not as concise and direct as DeepSeek 4.1 Flash in coding”
“the DeepSeek 4.1 models are currently the ultimate cost-effective model the rest have to match with”
“Both were great”
“I use DwarfStar DeekSeek V4 Flash on my Mac Studio with 128gb of RAM and it's pretty good - decent TPS and coding ability.”
“I use this thing daily and it’s neck and neck with SOTA models.”
“is quite smarter than dsv4 flash”
“Quite happily chugging along with a nice balance across them now.”
“DS 4 Flash, my previous daily driver, which I also found quite good”
“I think now I can understand the person who created that thread.”
“I am going back to DeepSeek for writing code.”
“I find Deepseek in particular is really good with Svelte work.”
“a minute later had my confirmation, along with a really nice explanation”
“I use Deepseek V4 flash 0731 Q8 quantisation from unsolth with reasoning turned off on a local server for quick easy tasks”
“Deepseek v4.1 Flash @ deepinfra.com has been really impressive and I've switched to that as my daily driver.”
“Running DeepSeek 4.1 Flash at FP4 is going to need at least a 10-15k machine. I'd consider that near frontier level.”
“they're more likely to go down rabbit holes, confidently assert falsehoods, or fix bugs with changes to my test harness rather than my code.”
“I've been loving DS4.1 Flash, it's been one of my daily drivers”
“I've been using DS 4.1 Flash for a while now as my main workhorse. It's amazing.”
“DeepSeek Flash 4.1 is generally what I use as as my workhorse.”
“I use DS 4.1 flash it all the time, i struggle to spend more than 1 euro per day on it”
“Its a daily driver for sure. not even worth considering anything else”
“We use Claude Fable to plan, and DeepSeek 4.1 Flash (hosted on DeepInfra) for everything else. Very cost effective.”
“DeepSeek 4.1 Flash kindof sucks.”
“I have been using DeepSeek 4.1 flash intensively for over a month. If I run it all day long it costs $1-2. Its fast.”
“I do think it's the most viable alternative I've seen so far”
“despite me using DeepSeek V4.1 Flash heavily as my implementation agent the past couple weeks”
“Deepseek v4.1 Flash is still the best value model and capable enough for almost everything I need to do.”
“I love DS flash, it is an amazing workhorse to implement plans created by more robust models”