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Cursor Composer 2 is just Kimi K2.5 with RL

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Re: Cursor Composer 2 is just Kimi K2.5 with RL

#11

Post by gillesjacobs »

justindotdev wrote: post #5

im pretty sure this is in violation of moonshot's ToS. this is going to be fun to watch unfold

They probably licensed it. Still a bit deceptive not to mention it on the model card/blog post, but companies whitelabel all the time without mentioning.

It goes against the ML community ethos to obscure it, but is common branding practice.

Re: Cursor Composer 2 is just Kimi K2.5 with RL

#13

Post by deaux »

Looks like two Moonshot employees confirmed that it's not licensed before Moonshot made the decision to get out of the debate and delete their posts [0][1].

[0] https://chainthink.cn/zh-CN/news/113784276696010804 - may have originally been https://x.com/apples_jimmy/status/2034920082602864990

[1] https://pbs.twimg.com/media/HD2Ky9jW4AAAe0Y?format=jpg&name=...

Re: Cursor Composer 2 is just Kimi K2.5 with RL

#14

Post by charcircuit »

rvz wrote: post #6

Honestly I don't think this leak is any good for Cursor. Not only this appears as a violation to Moonshot's ToS, this may also be in fact enough evidence for Anthropic to ban Cursor from using their models, just like they are doing to OpenCode. Why? As I said before, Anthropic mentions Moonshot AI (Maker of the Kimi models) as one of the AI labs that were part of this alleged "distillation attack" [0] campaign and wi…

Kimi K2.5 is an open source model. It is intended for people to make derivative models.

Re: Cursor Composer 2 is just Kimi K2.5 with RL

#15

Post by NitpickLawyer »

justindotdev wrote: post #5

im pretty sure this is in violation of moonshot's ToS. this is going to be fun to watch unfold

There is no ToS at play here. There's only the license[1], which is MIT modified like so:

> Our only modification part is that, if the Software (or any derivative works thereof) is used for any of your commercial products or services that have more than 100 million monthly active users, or more than 20 million US dollars (or equivalent in other currencies) in monthly revenue, you shall prominently display "Kimi K2.5" on the user interface of such product or service.

[1] - https://huggingface.co/moonshotai/Kimi-K2.5/blob/main/LICENS...

Re: Cursor Composer 2 is just Kimi K2.5 with RL

#16

Post by deaux »

gillesjacobs wrote: post #11
justindotdev wrote: post #5

im pretty sure this is in violation of moonshot's ToS. this is going to be fun to watch unfold

They probably licensed it. Still a bit deceptive not to mention it on the model card/blog post, but companies whitelabel all the time without mentioning. It goes against the ML community ethos to obscure it, but is common branding practice.

No they didn't [0][1]. With this leak they're probably negotiating as we speak, which could be why they've deleted the posts.

[0] https://chainthink.cn/zh-CN/news/113784276696010804

[1] https://pbs.twimg.com/media/HD2Ky9jW4AAAe0Y?format=jpg&name=...

Re: Cursor Composer 2 is just Kimi K2.5 with RL

#18

Post by jstummbillig »

gillesjacobs wrote: post #7

Cursor is mostly an IDE / coding-agent harness company. So it probably makes sense for them not to train their own base model, but instead license something like Kimi and fine-tune it for their own harness and workflows. Their moat looks pretty thin. A VSCode fork with an open-source LLM fork on top. In the fast-moving coding-agent market, it’s not obvious they keep their massive valuation forever.

There is a plausible scenario in which software engineering requires a very finite amount of intelligence, in which sota models will be used mainly for other things and where for coding the harness will become increasingly more important than the model.

Re: Cursor Composer 2 is just Kimi K2.5 with RL

#20

Post by antirez »

charcircuit wrote: post #12
justindotdev wrote: post #5

im pretty sure this is in violation of moonshot's ToS. this is going to be fun to watch unfold

Kimi K2.5 was released under a modified MIT license (100M+ MAU or $20M+ MRR has to prominently display Kimi K2.5). It will be fine.

Basically this is true for most startups in the world BUT Cursor, so here you are kinda inverting the logic of the matter. Cursor is at a size that, if they wanted to use K2.5, they could clearly state that it was K2.5 or get a license to avoid saying it.
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