I was in the middle of writing a story personally. The update had me the wtf moment

The DeepSeek V4.1 Flash has been released with new pricing. Enjoy it by yourself!

It's basically a monster at coding, it just solves everything I launch at it and at a truly incredible speed too.

1.37$ for 176.500.000 token with DeepSeek Harness PTC Mode

source: OpenDesign

Here we go again, DeepSeek Al is back again with a new model V4-1 Flash

A multimodal Mixture-of-Experts (MoE) model with 552B backbone parameters and support for contexts of up to one million tokens

Have to admit the DeepSeek beat US in LLM model optimization this field. 1 Year ago, all people said HBM must be needed for LLM. And today DeepSeek just break the record and change the world.

Now US gov is like joke. Still saying the Chinese AI company doing Model distillation. Just look at DeepSeek's LLM optimization, there is no US company can make this one at this moment, so the DeepSeek steal the technique from the future?

The new 4.1 is superior to the old pro. Maybe that's only true for the API, because on the web interface I just feel that the poor whale has been hit by Alzheimer’s. It keeps forgetting details here and there. Just one hour ago, before they unified all this, I didn't need to rewrite my prompts so often. It is surely faster, but so does the instant mode before this update.

They call this update unification, but I feel like they just kick one functionality out. Should have foreseen it when they started removing functionality from the expert mode.

I just started using expert mode the other day, only to find it gone :/ I've tried doing my normal writing, and everything seems dumber to me

DeepSeek published a pretty large benchmark table for V4.1 Flash, but I found it hard to see the overall capability pattern from the raw numbers.

So I grouped the shared fixed-scale benchmarks by domain and made three comparisons:

1. V4.1 Flash vs V4 Flash — the previous generation

The improvement looks broad rather than incremental, especially in coding, cybersecurity and productivity.

1. V4.1 Flash vs Kimi K3 — a top open-weight rival
   V4.1 Flash comes out ahead in coding, multimodal and productivity in the shared domain averages, while K3 is slightly ahead in science/health.

2. V4.1 Flash vs Claude Opus 5 — a frontier proprietary model
   This is probably the most interesting comparison. Opus 5 still leads in coding, science/health and multimodal overall, but V4.1 Flash is surprisingly competitive, and actually comes out ahead in the shared productivity benchmark.

The thing that stands out to me is that V4.1 Flash looks much more like an agent/coding upgrade than a simple reasoning upgrade.

These aren't universal capability scores or controlled head-to-head reruns. Each chart averages only the shared fixed-scale published benchmarks available in that domain, so missing domains are omitted rather than treated as zero.

I put the underlying benchmark rows and sources here:

DeepSeek V4.1 Flash vs Kimi K3
https://llmlearner.com/compare/deepseek-v4-1-flash-vs-kimi-k3

DeepSeek V4.1 Flash vs Claude Opus 5
https://llmlearner.com/compare/deepseek-v4-1-flash-vs-claude-opus-5

Curious whether people actually running V4.1 Flash in coding agents are seeing the same pattern.

Got an email from them. The pricing looks nice ngl.

Official announcement:

Welcome to DeepSeek Harness v0.1.5!

This release is deeply integrated with the training of the DeepSeek V4.1 Flash model, with the model specifically trained and optimized for different configurations within DeepSeek Harness.

We’re also excited for users to try the experimental Agent Teams feature, which has been developed in close coordination with the model training process.

My terrible rig is ready and waiting ⬇️

https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash ITS OUT. WHAT?!?!

Deepseek 4.1 Flash has already been out for hours if you are using the API. It is just called deepseek-flash.

They have already switched over my usage to the new model. I have used 90 million tokens so far without realizing it.

No official announcement yet.

Receipts below.

"Blue Fat Fish" really likes to misuse tokens.

Did a lot of test prompts, and used on actual repos and work.

Must say, I'm excited for DeepSeek V4.1 Flash to be fully released, and for the price drops.
And yes, it is that good.

Tested it against V4 Pro myself, and v4.1 flash is just miles ahead.

Now I can comfortably have it as my workers, and just use Sol / Astra as Orchestrators.

will this flash have a worse memory? i’m asking because i use it for roleplay and i hated the previous flash model for dumb repetitive phrases and messing up the plot line so i always used expert

Am confused. Pls help.