Cursor Composer 2 is just Kimi K2.5 with RL

Sammi

As a paying customer, it just doesn't feel good that they are trying to pass off someone else's model as their own. I mean I guess this is what businesses do all the time. There's a term for it even, it's called white-labeling. But is this all that Cursor have? They pass of VS Code as their own, they pass off Kimi as their own... What do Cursor even do? What do I need them for?

justindotdev

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

rvz

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 will use that reason to cut off Cursor, Just like they did to OpenAI, xAI and OpenCode. Let's see if the market thinks Composor 2 is really that good without the Claude models helping Cursor. (If Anthropic cuts them off). [0] https://www.anthropic.com/news/detecting-and-preventing-dist...

gillesjacobs

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.

agluszak

A hyped startup providing zero added value, burning investor money only to repackage somebody else's work? That's new... /s

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=...

lossolo

Their first model was also based on an open source Chinese base model. They never fully trained their own model.

todteera

From a users perspective, do we really care what model we're using under the hood? Or how well the software is solving our problems? Seems like cursor is trying to build a "thicker wrapper" beyond the harness. Either to protect against Anthropic shutting them off or increase margins.

mohsen1

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.

olejorgenb

To be fair, is "with RL", "just"? They should have disclosed it though. If they didn't it's a bad look for sure.

mono442

This whole ai stuff feels like a big bubble especially with the oil price soon at $200 and guaranteed recession.

koakuma-chan

Cursor can't compete with Claude Code's subsidized pricing, so they are trying to gaslight people that their cheap model is good enough.

vachina

A question. I’m due for a yearly Cursor subscription renewal, how does the credit limit look like? Currently I’ve not hit any of the limits despite using it quite rigorously, I wonder if this will change with a renewal?

DeathArrow

I whish it was GLM 5.0.

prodigycorp

There are many reasons to make fun of Cursor. However , one of the things get right is their autocomplete model. Are there any open models that come close? Why doesnt OAI or Anthropic dedicate some resources to blowing Cursor's model out of the water? Cursor's completion model is a sticking point for a lot of users.

heliumtera

For all the muh productivity guys that like to claim they can turn invisible when no one is looking, an produce 600k lock over 6 weeks, well...cursor is useless now. We know kimi K2.5 won't make you 100 trillion times faster. Cursor is killed for this market.

cbg0

Scores higher than Opus 4.6 on their in-house benchmark? Sounds legit.

HeavyStorm

There's no "just" in RL. Fine tuning is very important and could make a lot of difference.

chvid

Moonshot is raising money at a 10B usd valuation, cursor/anysphere is at a 30B usd valuation.

taytus

YC is back at it again.