The model is (like Composer 2) based on Kimi K2.5 and they claim SOTA performance for 1/10th of the cost. The tweet also mentions that they've started a new model from scratch on Colossus 2 (xAI/SpaceX Cluster). Really impressive how they've made this jump from being called the vscode fork with no moat just a couple of months ago.
everfrustrated
Full details https://cursor.com/blog/composer-2-5
jdlyga
It's a bit odd that they're not comparing it against Sonnet
svclaws
Their previous Composer was already marketed as a cheap model capable of competing with SOTA on most tasks. The evals they shared back then backed this up but in my day-to-day usage it fell short across the board. Canceled my cursor subscription and switched to Claude Code a few weeks ago. It has its own shortcomings but in terms of model capability and UX quality Cursor will have a hard time competing in the long term. Elon Musk will be a very good way out for them.
PUSH_AX
They set themselves up for flack when they use whatever these evals are… they did the same for composer 2 which was evaled in close competition with frontier models, spoiler alert, it wasn’t even close in practice. So now 2.5 is supposed to compete with opus 4.7? Sure…
sergiotapia
Congratulations on the launch! I'm interested in trying Cursor but it's very confusing what I should buy. What does the Pro $20 plan get me in usage if I only use Composer 2.5? How fast is the model?
It's always great that more companies are throwing their hat in the ring, especially focusing on value (latency + intelligence + cost)
re-thc
Did they just upgrade Kimi 2.5 to 2.6?
jtwaleson
Ok this might be weird but I've moved everyone in my 4 person team to our team plan and costs seem to have sky rocketed compared to the individual plans. Where before most people spent 20-100 USD, now the total bill is more like 1k USD. I haven't gone into the details but it feels like I'm being scammed.
lukebrichey
this feels super bullish on cursor/spacexai's ability to train a frontier level model. could be truly SOTA on coding given that their RL data is this powerful
granzymes
Surprised this got pushed off the front page so quickly! It’s exciting to see what the Cursor team has been able to do with significantly fewer resources than the frontier labs. I do wish they weren’t joining xAI. Something tells me there will be a contingent of researchers that departs Cursor if that merger is consummated.
memoryleakgame
If these benches from their site hold up (they likely wont) Wouldn't this compress ai revenue like 15x quickly If they really have a 4.7 opus high equivalent at 1/16 the cost wouldn't this significantly effect all the current capex and planing Maybe they are getting elon to cover cost
polski-g
I don't know why their model isn't on Openrouter yet. They must not have enough capacity to offer it.
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Discussion Highlights (14 comments)
asar
The model is (like Composer 2) based on Kimi K2.5 and they claim SOTA performance for 1/10th of the cost. The tweet also mentions that they've started a new model from scratch on Colossus 2 (xAI/SpaceX Cluster). Really impressive how they've made this jump from being called the vscode fork with no moat just a couple of months ago.
everfrustrated
Full details https://cursor.com/blog/composer-2-5
jdlyga
It's a bit odd that they're not comparing it against Sonnet
svclaws
Their previous Composer was already marketed as a cheap model capable of competing with SOTA on most tasks. The evals they shared back then backed this up but in my day-to-day usage it fell short across the board. Canceled my cursor subscription and switched to Claude Code a few weeks ago. It has its own shortcomings but in terms of model capability and UX quality Cursor will have a hard time competing in the long term. Elon Musk will be a very good way out for them.
PUSH_AX
They set themselves up for flack when they use whatever these evals are… they did the same for composer 2 which was evaled in close competition with frontier models, spoiler alert, it wasn’t even close in practice. So now 2.5 is supposed to compete with opus 4.7? Sure…
sergiotapia
Congratulations on the launch! I'm interested in trying Cursor but it's very confusing what I should buy. What does the Pro $20 plan get me in usage if I only use Composer 2.5? How fast is the model?
ChrisArchitect
Non-x link: https://cursor.com/blog/composer-2-5 ( https://news.ycombinator.com/item?id=48182126 )
vanuatu
It's always great that more companies are throwing their hat in the ring, especially focusing on value (latency + intelligence + cost)
re-thc
Did they just upgrade Kimi 2.5 to 2.6?
jtwaleson
Ok this might be weird but I've moved everyone in my 4 person team to our team plan and costs seem to have sky rocketed compared to the individual plans. Where before most people spent 20-100 USD, now the total bill is more like 1k USD. I haven't gone into the details but it feels like I'm being scammed.
lukebrichey
this feels super bullish on cursor/spacexai's ability to train a frontier level model. could be truly SOTA on coding given that their RL data is this powerful
granzymes
Surprised this got pushed off the front page so quickly! It’s exciting to see what the Cursor team has been able to do with significantly fewer resources than the frontier labs. I do wish they weren’t joining xAI. Something tells me there will be a contingent of researchers that departs Cursor if that merger is consummated.
memoryleakgame
If these benches from their site hold up (they likely wont) Wouldn't this compress ai revenue like 15x quickly If they really have a 4.7 opus high equivalent at 1/16 the cost wouldn't this significantly effect all the current capex and planing Maybe they are getting elon to cover cost
polski-g
I don't know why their model isn't on Openrouter yet. They must not have enough capacity to offer it.