Live data from Hacker News

Cursor Composer 2 is just Kimi K2.5 with RL

twitter.com

111–120 of 180 posts

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

#111

They’re pretty upfront in their release post that they took an open source model and improved it with their own coding data. They mention “continued pretraining” (on top of the base model) and RL. Cursor never claimed to have done a full pretraining run. More to the point, beating Opus 4.6 at coding and coming within striking distance of gpt-5.4 is impressive! The benchmarks outperform raw Kimi K2.5. It’s particularl…

[deleted]

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

#112
What do people like about cursor? I've been using it for the past couple days, and I just don't see many positive things about it. It seems people like the autocomplete so I'll have to give that a try.

There's just too many "features" the ux ends up being all over the place. I thought having the browser inside of the editor would be great for design, but it's not that much better than just having your browser open along with your editor.

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

#114
post #79

Earlier quoted context omitted.

> Cursor Composer 1 was Qwen and this is Kimi. IDE is based on VSCode. The entire company is build on packaging open source and reselling it. The question is, where's the outrage? Why are there no headlines "USA steals Chinese tech?" "All USA can do is make a cheap copy of Chinese SOTA models". > So funny to see Twitter go wild saying "a 50 person team just beat Anthropic" blah blah. Well, if it's an American company…

because its open source.

Like licenses are worth anything in the AI world…

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

#115
post #20

Earlier quoted context omitted.

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.

In practice nothing happens after violating an open source licenses, especially if you are willing to follow the terms after being notified.

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

#116

Earlier quoted context omitted.

Open source licence requires attribution which obviously it is not done in this case.

No it doesn’t? Depends on the license

I doubt that there is any open source license that don't require attribution but we are talking about a specific case and the license require it [1]

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

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

#117
post #96

Earlier quoted context omitted.

But you have to buy into it right? If you don't have a limit then what did your contract look like?

I signed up last year when the limits were a lot more generous.

Interesting. I wasn't aware that cursor also has a free tier!

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

#118
post #22

Cursor Composer 1 was Qwen and this is Kimi. IDE is based on VSCode. The entire company is build on packaging open source and reselling it. Ollama is also doing this. There is so much money to be made repackaging open source these days. So funny to see Twitter go wild saying "a 50 person team just beat Anthropic" blah blah.

> Cursor Composer 1 was Qwen and this is Kimi. IDE is based on VSCode. The entire company is build on packaging open source and reselling it. The question is, where's the outrage? Why are there no headlines "USA steals Chinese tech?" "All USA can do is make a cheap copy of Chinese SOTA models". > So funny to see Twitter go wild saying "a 50 person team just beat Anthropic" blah blah. Well, if it's an American company…

Do you think Chinese LLMs acquired training data legitimately? I think the whole situation is a bit funny, but I don't think the US "started it" to be fair.

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

#119
post #22

Cursor Composer 1 was Qwen and this is Kimi. IDE is based on VSCode. The entire company is build on packaging open source and reselling it. Ollama is also doing this. There is so much money to be made repackaging open source these days. So funny to see Twitter go wild saying "a 50 person team just beat Anthropic" blah blah.

> a 50 person team just beat Anthropic How does this blow that narrative up? A 50 person team likely broke a license to have a product that's competitive on output at a fraction of the costs of one of the most well capitalized companies on the planet. Claude code and anthropic are certainly the darlings of the space today, but to me this just reinforces the idea that their moat is razor thin on the model front, even…

Considering how AI companies incestously RL on each other's models, I would not be surprised if any number of behavioral patterns and (claims to be ChatGPT/Claude/Deepseek or whatever) just popped up on new models constantly.

I would also not rule out that since K2 is an 1T model, this is a distill, as I don't think they're serving expensive models just like that, which would not be a licensing violation?.

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

#120

Earlier quoted context omitted.

> a 50 person team just beat Anthropic How does this blow that narrative up? A 50 person team likely broke a license to have a product that's competitive on output at a fraction of the costs of one of the most well capitalized companies on the planet. Claude code and anthropic are certainly the darlings of the space today, but to me this just reinforces the idea that their moat is razor thin on the model front, even…

Considering how AI companies incestously RL on each other's models, I would not be surprised if any number of behavioral patterns and (claims to be ChatGPT/Claude/Deepseek or whatever) just popped up on new models constantly. I would also not rule out that since K2 is an 1T model, this is a distill, as I don't think they're serving expensive models just like that, which would not be a licensing violation?.

There's a now-deleted tweet from a Kimi dev claiming that they verified the tokenizier was the same, which would imply it going at least beyond RL. Could still be a distill I think.
Post reply on HN