DeepSeek launching v4.1 flash cheaper and more capable than v4 pro

Post by VulgarExigency » Wed, Sep 09, 2026, 2:03 PM UTC

KyleTheDev wrote: post #54

hinow wrote: post #28

But what no one mentions is that the price is going from a starting point of $0.16 to $0.60, so basically they're charging nearly four times as much.

Like _aavaa_ said, make sure you're comparing the right vals 1:1. There's different costs for cache hit, cache misses, output tokens, etc. This one seems, during non-peak hours, cheaper. Peak hours are obviously more expensive, if they're gonna be 2x non-peak pricing. But, that might end up decreasing in the future.

Post by hinow » Wed, Sep 09, 2026, 2:03 PM UTC

KyleTheDev wrote: post #54

hinow wrote: post #28

But what no one mentions is that the price is going from a starting point of $0.16 to $0.60, so basically they're charging nearly four times as much.

Like _aavaa_ said, make sure you're comparing the right vals 1:1. There's different costs for cache hit, cache misses, output tokens, etc. This one seems, during non-peak hours, cheaper. Peak hours are obviously more expensive, if they're gonna be 2x non-peak pricing. But, that might end up decreasing in the future.

Post by bendangelo » Wed, Sep 09, 2026, 2:04 PM UTC

mattmcal wrote: post #57

jiehong wrote: post #20

Sounds nice! But, the web ui chat version of flash has very poor language following abilities in my experience: You may ask it something in English, and get a thinking chain in Chinese with an answer in Chinese, or an English thinking chain and an English answer. Using the retry button on the same question has a 50/50 chance of any of those results. Sometimes, asking something in English, but where information are mo…

It's not just web chat, V4 Flash 7/31 suffers from a lot of pathological behavior in coding harnesses as well, e.g. infinite loops, hallucinations, premature termination, and invalid tool calls.

Post by bwfan123 » Wed, Sep 09, 2026, 2:06 PM UTC

thrownaway561 wrote: post #13

I will continue to be amazed by how much power you get from DeepSeek Flash for the cost. I have let that puppy lose on so many projects and it is has never let me down. It can build and entire Rails app in no time and even do the tests. For most things, I don't get why people pay the money for Claude. DeepSeek Flash is my default agent in Omarchy.

Post by wolttam » Wed, Sep 09, 2026, 2:07 PM UTC

NitpickLawyer wrote: post #48

It's interesting that this is the third lab to find problems with larger models. Earlier last year oAI was rumoured to have failed their large pretrain. Now google has problems with their pro series, and ds just announced the same. There are some rumours on chinese forums talking about problems with the pretraining phase, so this is not mid/post training related. I wonder if this comes from using the bad architecture…