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Posted by leerob 10/29/2025

Composer: Building a fast frontier model with RL(cursor.com)
215 points | 168 commentspage 2
SafeDusk 10/30/2025|
I think both Cursor and Cognition and going in the same direction of SWE-grep[0].

SWE-grep was able to hit ~700tokens/s and Cursor ~300token/s, hard to compare the precision/recall and cost effectiveness though, considering SWE-grep also adopted a "hack" of running it on Cerebras.

I'm trying to kickstart a RL-based code search project called "op-grep" here[1], still pretty early, but looking for collaborators!

[0]: https://cognition.ai/blog/swe-grep [1]: https://github.com/aperoc/op-grep

swyx 10/30/2025|
excited to see how far you get with opgrep!
SafeDusk 10/30/2025||
hehe thanks! as a self taught AI engineer, might take awhile =D
toobulkeh 10/30/2025||
I used the new system tonight and it felt like a definite downgrade. Generated a few non-working basic apps, couldn’t handle CSS in a NextJS environment. Terminal context didn’t work. And it went back to not reasoning through the problem until resolution. And kept slowing down.

I’m assuming major release vs stable, but this is pretty lackluster so far. Switched back to Sonnet reasoning. Here’s to improving!

carlosbaraza 10/29/2025||
Could anyone explain how to use multiple agents and subagents in Cursor, Claude Code, or others? It is already challenging to me taming one model doing work, let alone synchronizing multiple parallel workers.

Do you have to split the plan in parallelizable tasks that could be worked in parallel in one codebase without breaking and confusing the other agents?

asdev 10/29/2025|
you can use git worktrees and just have multiple Claude Code terminal instances working on each worktree. That way they don't clash, just delete the worktree when the task is done.
carlosbaraza 10/29/2025||
I have never leveraged git worktrees... That is such a crazy useful tool that I am almost ashamed of not having researched it before. Git is such a beautiful piece of software.
asdev 10/29/2025||
I built an open source project to make the whole workflow easier: https://github.com/built-by-as/FleetCode
koakuma-chan 10/30/2025||
I just gave it a try and it's reaally fast. Didn't expect this from you Cursor, good job.
kilroy123 10/29/2025||
What I can't stand about cursor is the constantly changing and confusing billing and usage.

I think competition in the space is a good thing, but I'm very skeptical their model will outperform Claude.

80hd 10/29/2025||
Insane velocity from the Cursor team. I wonder how they move so fast?
srush 10/29/2025|
We don't wear shoes [1].

[1] https://www.businessinsider.com/no-shoes-policy-in-office-cu...

timcobb 10/29/2025||
I would have thought it's because you use Cursor...
netcraft 10/29/2025||
I love cursor, the tab completion and agent mode. But I really dislike vscode after using intellij for so many years. I really wish the underlying editor was better, or I could get cursor features in intellij instead. The editing of the files is mostly fine, but its everything else around it that a full IDE provides thats just so much better. Right now its intellij + claude code for me, and its fine, but I wish I could get the AI power of cursor in a better package.
pbowyer 10/29/2025||
Intellij's tab-complete is coming along; it's hit and miss if it will work but for similar edits I'm finding it picks up the pattern quickly and I can tab - tab - tab to make them happen.

Still not up to Cursor standards though :)

DefineOutside 10/30/2025||
I find Cursor's tab completion to be distracting enough with multi-line changes that I just disabled it, while I use IntelliJ's tab completion regularly.

Cursor's tab completion is better, but it doesn't seem to have a concept of not trying to tab complete. IntelliJ is correct half the time for completing the rest of the line and only suggests when it is somewhat confident in its answer.

pbowyer 10/30/2025||
I agree about the multi-line blocks Cursor proposes. Like it gets the first two lines right and then after that it's nonsense. I'd rather it stuck with a single line change at a time, and let me press enter before it predicts again.
Jcampuzano2 10/29/2025||
Building off of VSCode was probably Cursors silver bullet and the best decision they could have ever made.

It made migrating for everyone using VSCode (probably the single most popular editor) or another vscode forked editor (but at the time it was basically all VSCode) as simple as install and import settings.

I do not think Cursor would have done nearly as well as it has if it didn't. So even though it can be subpar in some areas due to VSCodes baggage, its probably staying that way for a while.

netcraft 10/29/2025||
I dont disagree with anything you said. If I was in their shoes, I would have done exactly the same thing.

Maybe my complaint is that I wish vscode had more features like intellij, or that intellij was the open source baseline a lot of other things could be built on.

Intellij is not without its cruft and problems, dont get me wrong. But its git integration, search, navigation, database tools - I could go on - all of these features are just so much nicer than what vscode offers.

carlosbaraza 10/29/2025||
Cursor 2.0 keeps crashing on me while having an agent running and opening the IDE part of the application. I might have to rollback.
amilich 10/29/2025|
Hey - really sorry to hear this - could you email me andrew@cursor.com? Here are 3 suggestions to try- 1. Reset your settings.json - if shared with vscode, sometimes settings can cause perf regressions 2. Could you try cmd-shift-p -> "capture and send debugging data"? Will send us some profiling data to debug 3. Clear your user data (will delete chats) as a last resort - cmd-shift-p, "reveal user data," close the app, then delete this folder and restart the app
Jayakumark 10/29/2025||
This looks like a model RLed on top of Qwen3-Coder or GLM 4.6 as per their graph and foot note.
romanovcode 10/29/2025|
Where is the comparison with Sonnet 4.5? That would be the only thing that matters, really.
matheist 10/29/2025|
> "Best Frontier" includes GPT-5 and Sonnet 4.5, which both outperform Composer.
yodon 10/29/2025|||
>> "Best Frontier" includes GPT-5 and Sonnet 4.5, which both outperform Composer.

Looking at the graph, it would appear there's an implicit "today" in that statement, as they do appear poised to equal or surpass Sonnet 4.5 on that same benchmark in the near future.

ciphix 10/30/2025||
What Cursor is really emphasizing here is speed — they’re claiming it runs about four times faster than GPT-5/Sonnet, while still offering roughly the same level of performance.
timcobb 10/29/2025|||
Does anyone code with GPT-5? I've never had it work in Cursor. I mean, like, at all.
srush 10/29/2025||
A lot of people use it! It scores very well on our benchmarks, significantly better than Composer-1.
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