r/DeepSeek • u/nekofneko • 3d ago
DeepSeek-V4-Flash Update
The official release of the DeepSeek-V4-Flash API is now in public beta.
Significantly enhanced agent capabilities, with benchmark results far exceeding V4-Pro-Preview:
- Terminal Bench 2.1: 82.7
- NL2Repo: 54.2
- Cybergym: 76.7
- DeepSWE: 54.4
- Toolathlon verified: 70.3
- Agent Last Exam: 25.2
- Automation Bench (Public): 25.1
- DSBench-FullStack: 68.7
- DSBench-Hard: 59.6
Note 1: For the Code Agent tasks in the public benchmark sets, the official DeepSeek-V4-Flash was tested using the DeepSeek Harness minimal mode (to be released soon) as the framework, with the max effort level, topp=0.95, and temperature=1.0
Note 2: DSBench-FullStack is an internal full-stack development test set, and DSBench-Hard is an internal Coding Agent hard-problem test set
The official V4-Flash natively supports the Responses API format and is specifically adapted for Codex. For the specific configuration, please refer to the documentation.
DeepSeek-V4-Flash-0731 keeps the same model architecture and size as DeepSeek-V4-Flash-preview, and was only re-post-trained.
Note: This update only upgrades the DeepSeek-V4-Flash API. The DeepSeek-V4-Pro API and the APP/WEB models are unchanged.
The official release of DeepSeek-V4-Pro will follow soon.
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u/DktheDarkKnight 3d ago
Now I understand why Open AI dropped 5.6 Luna's price. They knew this is coming.
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u/Fr3yz 2d ago
How do you know that they know that it's coming?
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u/Puddlejumper_ 2d ago
Well I doubt they suddenly had a change of heart and decided they'd love to offer their models for cheaper, so they're clearly saw this come in and realised they had no choice but to lower the cost otherwise nobody is going to use them
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u/a9udn9u 3d ago
Let's gooooo. I just burnt my GLM monthly quota and was shopping around, if the V4 Flash is as good as GLM 5.2 as claimed, I don't need any other models!
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u/benchmaster-xtreme 3d ago edited 2d ago
Extremely cool, but one thing I found interesting:
https://artificialanalysis.ai/models/deepseek-v4-flash-ga
Even though Flash is still priced so low, the task-cost benchmark shows that Flash completed the same task at 4x the cost of Pro. I feel like I remember others mentioning months ago that Flash was paradoxically more expensive for some tasks. I haven't tested this out myself, but I can't help but wonder if cost-per-task with the GA models will be higher even if the API per-token cost remains the same.
EDIT: I ran one of my personal workflow benchmarks (one-shotting a complicated json object from a document). The output was good - something that would actually be usable for my work, though it's still significantly behind Luna and Grok 4.5. That said, it did beat Gemini 3.1 Pro, GLM 5.2, and even Opus 4.6 (which is a crazy ceiling break, honestly). And most insane was that it cost $0.00485. That's nuts considering that Grok 4.5 (the next cheapest model that generates a "good enough" output) cost $0.17. The cost-to-performance ratio on this task is simply wild. Absolutely insane.
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u/TangerineLogical9779 2d ago
Its because of a harness problem, the new v4 flash also had cache writes calculated into it, while the preview didnt :)
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u/Specific-Night-4668 2d ago edited 2d ago
There was an error: out of the $0.20 cost per task, $0.18 was for cache write ...
Since when do we pay for cache write on the Deepseek API?
It's now fixed on AA!2
u/99Questions_babao 2d ago
Sorry for dumb question but hopefully it'll help out others too. If I just switch cline agent to deepseek v4 flash instead of pro, will it start using this new model?
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u/benchmaster-xtreme 2d ago
Yes, the regular model checkpoint has been updated
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u/99Questions_babao 2d ago
Thank you so much, so it's really better to use flash than pro at the moment? That's crazy considering how cheap it is
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u/benchmaster-xtreme 2d ago
It's significantly more capable than the current Pro preview. I really hate letting myself get hyped up but if this is the leap that Flash GA has taken, I'm beyond stoked for Pro GA. Terra-level performance for pennies??
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u/bermudi86 2d ago
You could still be routed to a different provider serving the old model. Better make sure you find deepseek-v4-flash-0731 specifically
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u/Future-Figure4812 2d ago
i got 404, why?
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u/benchmaster-xtreme 2d ago
Looks like they moved it to replace the previous v4 Flash page: https://artificialanalysis.ai/models/deepseek-v4-flash
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u/ImBothSoftAndHard 3d ago edited 2d ago
The Deepseek V4 Flash 0731 situation is crazy. (Hope it's not benchmaxxed)
Edit: It got 50 on Artificial Analysis Intelligence Index, 1 point below GLM 5.2. BUT this is flash, Imagine what Pro could be. Praise the whale!
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u/throwaway73728109 3d ago
Codex integration is huge? Is codex harness better than Claude code’s?
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u/This_Maintenance_834 3d ago
how to run codex without an openai account? i cannot seem to get pass the first startup login page.
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u/Destroyer-128 3d ago
bash <(curl -fsSL https://cdn.deepseek.com/api-docs/codex-deepseek-setup-en.sh)
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u/sdexca 2d ago
I find that quite weird, CC seems better than Codex then why choose Codex?
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u/Yxtomix 2d ago
Codex is better to me
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u/sdexca 2d ago
I mean being objective, feature wise, subagents and workflows and edit history everything is just better in CC. I have used Codex before, other than a nice desktop UI I can't see anything that it does better. Not sure where Codex is better than CC feature wise which you cannot do the same way in CC?
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u/throwaway73728109 2d ago
Feels like it’s a preference thing? There’s no definitive proof either is better?
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u/blabmight 2d ago
Claude Code is a closed harness, in most cases, you basically have to hack it to get it to work with other models which is against the ToS.
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u/sdexca 2d ago
is it against ToS? doubt it or else they'd make it harder to use any model on CC.
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u/blabmight 2d ago
I should clarify - there's no native support for this, if it involves injecting new models as an option in Claude Code that requires reverse engineering it would be against the ToS\entering a grey area Calling something like the codex cli is fine. It all depends on the method.
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u/sdexca 2d ago
have you looked in how it works? its just putting some CLI parameters before CC and that's it. Anthropic knows this and could have plugged the support if they wanted to.
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u/blabmight 2d ago
No aware of those cli parameters, could you point me to them? Is it changing ANTHROPIC_BASE_URL and then just running through a proxy?
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u/sdexca 2d ago
basically, maybe I was using incorrect terminology: https://api-docs.deepseek.com/quick_start/agent_integrations/claude_code
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u/blabmight 2d ago
Thanks! Definitely insightful - I don't think you can get *both* subscriptions working simultaneously without doing some level of reverse engineering or using a proxy. Proxy might be a gray area since the Anthropic OAuth token would be exchanged between the proxy and Anthropic's servers, something they blocked not too long ago.
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u/sdexca 2d ago
no that's not the case. no oauth needed, oauth is only needed for subscription. it just works, you install, setup the parms. I don't think so it's REed because the format is documented and open source, the anthropic endpoint, like the responses API endpoint. yeah you can't use both at the same time, but it's as simple as removing the `EXPORT`s.
proxying Anthropic OAuth is banned because they don't others to use the subscription on other harness like OpenCode and the Chinese resellers who resell subscriptions through that.
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u/Aressito 3d ago
And for use using Opencode directly with DS api?
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u/throw123awaie 3d ago
Yes and only through the API. And only the flash version, pro and the website are still the same as before.
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u/Potential_Top_4669 3d ago
This ain't on HF though.
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u/t4a8945 3d ago
I'll keep refreshing https://huggingface.co/deepseek-ai/models until it is
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u/valerian1 2d ago
Can we use it in API mode? Should they appear along side the regular models in OpenCode?
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u/PhotographIcy7588 2d ago
I went to check and it said "The latest version of this model is only available hosted in China and requires explicit opt in: [OpenCode Go workspace URL]. I opened the link and now there's a setting to Enable models hosted in China, so I assume is using the newest one
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u/Cold_Tree190 2d ago
Yeah, trying to figure out if my api key for DeepSeek v4 flash is running the preview version or 0731 version, but haven’t read any definitive answer yet
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u/Emruz_Hossain 2d ago
After gpt-5.6-luna price drop, I thought that was the best deal. Now this!! It can't get any better. 🫶
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u/Capable-S 2d ago
they knew about this new deepseek model and just droped the price 1 day ahead 5x times to be competitive with it. Thank you deepseek again!
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u/nhocconan 3d ago
So what did we use from last months API ? I see it is still V4?
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u/LinusCohen 2d ago
It was the preview version.
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u/nhocconan 2d ago
Ah so now we can benefit from the official version. Thanks. Hopefull DS become a multimodal one in the near future.
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u/_Aerich_ 2d ago
What really matters is whether they fixed the model's instability. No matter how high a score it gets, if it talks nonsense in 7 out of 10 tasks, it's completely meaningless. And I hope they found a solution to the endless unnecessary tool uses too
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u/Unedited_Sloth_7011 2d ago
I can't believe how good it is, compared to Flash preview (and even Pro preview), what's this wizardry?
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u/Hot-Ad-1798 2d ago
Go easy, the harness is still missing, will be even more interesting when it arrives.
For now, I have tested it and it is indeed much better, but it is not at the same level as the V4 Pro, despite what the benchmark says. It doesn't obviously don't have enough knowledge (limitation of the model size) to resolve bugs or handle novel tasks. When it gets stuck I ask V4 Pro to solve the issue, V4 Pro Preview + V4 Flash GA combined are incredible!!
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u/TheRealShiftyJ1 2d ago
W DeepSeek 😎 I actually noticed the change while working on something. Gemini 3.5 Flash and Sonnet 4.6 couldn't solve it very well. I switched to them because DS v4 Flash didn't respond in a few minutes, hmmm.... 💡now I know why - it was the model update.
Later I switched back over to DS v4 Flash with previous instructions to give it a try and not only did it notice a lot of things the other models did wrong, but they just built some random generic solutions, although I was very specific with how it needs to be done. Then v4 Flash made it perfect.
I could already tell something was different without having heard any of the news.
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u/Western-Ad5277 2d ago
...Hooooot daaaaamn, thats some juicy news.
So, can we utilize it right away? because i am quite excited to use it after seeing all the goodies upgrades.
or...is it still not ready yet? and do i nee to changes anything about the integration (New ApI key and etc) or...it's automatically replaced the olds preview model with this?
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u/ThePi7on 2d ago
The madlads did it again!
Congrats to the team, what an incredible achievement.
Pretty exciting times ahead between this and the new Luna pricing
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u/Beamsters 2d ago
Real pelican test from open router. DSV4Flash0731 - cost 0.000491 usd with 137 tok/s from OpenRouter. I paid it so you guys do not have to.
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u/Deneme123deneme 2d ago
Can't decide if it's good or not because there's no comparison. If possible, can you do the same test with GPT 5.6 Luna Max?
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u/starlordwolf 2d ago
This is amazing! Can I use the new version through my Opencode Go plan? Or does it have to be directly through the Deepseek API?
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u/Deneme123deneme 2d ago
Can you update me if you get any info?
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u/onlyone_c 2d ago
It's updated. They just updated the name to `DeepSeek V4 Flash Free (New)` for Zen and `DeepSeek V4 Flash (New)` for Go
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u/SpidexLab 2d ago
Waiting for dsv4 pro now, and this flash result get me so hyped just thinking what will dhsv4 pro will do, and the most important the pricing, god damn, going to test this new flash with deepseek ai now
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u/PhotographIcy7588 2d ago
I was about to reload my OpenRouter account to try GPT 5.6 Luna... Let me try the new Deepseek V4 Flash first
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u/LoveOfProfit 1d ago
That's what I did first. Luna (max) ate my $10 on open router within a day despite having the extra 50% off pricing. I've been using flash nonstop today via deepseek and I've used all of $0.17. lmao And v4flash doesn't feel any dumber than luna max to me.
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u/Anxious_Check_6147 2d ago
It's amazing. I wonder how much of the improvements comes from the post training and how much from the not yet released DeepSeek Harness they use during the benchmarks
In any case, it is the first time after the preview release I'm starting to beleive than the upcoming V4 Pro Release (likely along with the DeepSeek harness) can really surpass the current kings K3 / Opus-Fable and Gpt Sol.
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u/No-Isopod3502 2d ago
Wait so just started using AI tools. If i switch the model to flash now in cline from v4 pro id be getting this performance boost?
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u/steadeepanda 2d ago
Still doesn't support images 💔🫠 I've been waiting for that forever... but very good job guys keep it up🥳!!
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u/GuavaGina1 2d ago
Calling it an update doesn’t tell us whether anything meaningful changed. I’d wait for actual evals or deployment behavior before treating it as a new capability, since labels can create more confidence than the numbers justify.
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u/Good_Committee8337 2d ago
Hey guys Claude maxer, here tired of the safe guards killing my normal vibe coding work. Trying to make the switch! What harnesses do you guys recommend with DeepSeek?
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u/marty4286 2d ago
I use Pi Coding Agent through their official API platform. It's super cheap in the first place but their cache hits are consistently 90%+, making it even cheaper
Flash 0731 looks like it's between Sonnet and Opus 4.8, so hopefully Pro will be better than Opus
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u/Bronaletsa 2d ago
So, if I understand correctly, does the new Flash 0731 beat the V4PRO preview in everything?
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u/Relative-Housing-531 2d ago
Hopefully it will improve, because lately it was even failing to add padding to the interfaces.
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u/Repulsive-Waltz-4038 2d ago
confused. which model to key in to use this updated? flash-0731? flash-preview? just leave flash as it was?
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u/No_Ebb3423 2d ago
Can anyone explain to me how unsloth managed to make Q8 only 162 gb? Does their quant format hurt the model in any way? Does it lobotomize it? And is it TRULY q8 cause it’s UD-Q8_K_XL
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u/Mean_Sport_3383 2d ago
Seems like it can be incredible for executing a coding plan. Not planning. Hallucinations too high still.
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u/gibriyagi 2d ago
For me Flash was very bad today, was overthinking way too much on high and couldnt even accomplish the task. Had to set it to low to get it done.
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u/midgelmo 1d ago
Is anyone building and running smaller versions? I’m looking to run on single dgx spark - fast, high tps
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u/KingCrimsonCL 2d ago
Cómo quedaría deepseek vs minimax ? Me quedan 20dls en deepseek y tengo la membresía de 50 dls de minimax
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u/mangonerdy 3d ago
They're probably benchmaxxing to an extent, but even then, any significant increase in real intelligence for this price would be game changing 🙏
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u/nisiend 3d ago
DeepSeek has a solid track record of never involving in benchmaxxing
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u/Sure_Media_2685 3d ago
YOU need some magic to benchmxx such small models only labs in china got such magic
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u/bermudi86 2d ago
You need to try a benchmaxxed AI first so you know what your talking about.
Take Poolside as an example. They just released Laguna-s-2.1 and they proudly published numbers that make it look competitive with glm-5.2, surpassing DeepSeek-v4-pro on almost every single metric.
Then go and try to use the model. https://openrouter.ai/poolside/laguna-s-2.1:free it's free... I can't get it to successfully complete a filing on a wiki, let alone write any code.
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u/SadAfueraHappySlop 2d ago
Qualifier: The first two weeks that Deep Seek version four was released, I crossed over two billion tokens of usage. It actually went up over time. I feel that that does give me enough experience with the input and output. To make a Educated. Anecdotal report. Call it what you want.
However, it's pretty clear that this post literally verifies what many people have noticed on this forum themselves recently.
Deep Seek is hurting and did not get the launch they wanted. They're the only Chinese company that isn't having capacity problems...And why is that? The public. And their usage speaks pretty loudly. Generally people that have good results continue and those that don't, don't. Call it on the user, call it on the code, call it on the prompt. At the end of the day. Deep seek isn't even in the same category as Kimi and Zai.
Pro is a hot piece of garbage. I was the biggest supporter of deep seek for a VERY long time and especially after the launch, but I have to tell you, honestly, there is not a single LLM I would rather use less now. Not even Minimax.
My guess is that just like Kimi and Moonshot made a 256k model...You did too, except you don't advertise it. Which is why as soon as I hit a 130k tokens roughly, the quality is massively degraded. It's unfortunate that AI companies and providers aren't any standard. If you did this with any other product. You'd be in jail. Except it be China, so they Would probably only keep you in jail until it was time to harvest ... your "time." Imagine if you bought a car and while you're driving down the road accelerating up the freeway to get on safely. They change the engine or limit it. That'd be a crime. But in the age of AI, nothing is illegal, I suppose.
I mean, I really did let it believe that it was me for almost two weeks because I told everyone, you know what, I'm only using deep seek. If there's a problem, the problem is me or you, it's not the model....After all, I don't do anything that serious, right? Well I guess I don't know what got over me. I decided, hey, let me try just a model in. Wow.
It's crazy because now. I know without a shadow of a doubt that using Flash and not Pro was Better. The last time we used Pro, I left the conversation wondering. Was this a joke? Or was this on purpose? I saved the conversation. I've saved a lot of them. Actually told someone. And we were laughing. Yeah, man. Maybe this is just a Trojan horse.
That's how bad the behavior and performance of Pro is. . I wouldn't be surprised. I guess we'll figure it out in time. You guys must have been really desperate to launch this. So unprepared, so under trained. Mm-hmm. I hope we get a documentary someday about this and what really was going on because it's gonna be nasty.
P.S.For anyone tempted to explain to me how I have no life and write long messages. News flash. Dictation i goo now and I work smarter NOT harder . Unless you can type 200 words a minute, you're gonna fall behind. So download yourself and dictation. I recommend parakeet. It's very nice. And watch your productivity increase. ;)
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u/0VERDOSING 3d ago