> Composer 2.5 is built on the same open-source checkpoint as Composer 2, Moonshot's Kimi K2.5.
Really nice to see they're giving credit to the company and I am optimistic Kimi K open models soon will outperform Opus models
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bingud
Seems like a promising and useful model but its probably scary how much customer data they fed into it to reach this performance
goyozi
I kind of want to try it, to see if and how far they can take an open model and improve it but I really don’t miss the Cursor user experience. Constant UI changes, half-baked features, smaller and smaller limits, useless AI change attribution; I think I’ll wait for others to report if it’s any good.
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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
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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.
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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…
It's a bit confusing to me why they'd make this 'fast' version the default, as it appears to be much more expensive than Composer 2. Wasn't it supposed to be a very cheap alternative to SOTA models?
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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.
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uf00lme
I wonder why they didn’t train off Kimi 2.6, I hope is it because they already had a good base and not that they messed up that relationship.
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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.
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big-chungus4
Can you please train Qwen 3.5 like 0.8B to 9B using the same training techniques
vanuatu
It's always great that more companies are throwing their hat in the ring, especially focusing on value (latency + intelligence + cost)
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
jdlyga
It's a bit odd that they're not comparing it against Sonnet
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re-thc
Did they just upgrade Kimi 2.5 to 2.6?
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polski-g
I don't know why their model isn't on Openrouter yet. They must not have enough capacity to offer it.
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.
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?
> Composer 2.5 is built on the same open-source checkpoint as Composer 2, Moonshot's Kimi K2.5.
Really nice to see they're giving credit to the company and I am optimistic Kimi K open models soon will outperform Opus models
Seems like a promising and useful model but its probably scary how much customer data they fed into it to reach this performance
I kind of want to try it, to see if and how far they can take an open model and improve it but I really don’t miss the Cursor user experience. Constant UI changes, half-baked features, smaller and smaller limits, useless AI change attribution; I think I’ll wait for others to report if it’s any good.
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
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.
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…
Full details https://cursor.com/blog/composer-2-5
It's a bit confusing to me why they'd make this 'fast' version the default, as it appears to be much more expensive than Composer 2. Wasn't it supposed to be a very cheap alternative to SOTA models?
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.
I wonder why they didn’t train off Kimi 2.6, I hope is it because they already had a good base and not that they messed up that relationship.
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.
Can you please train Qwen 3.5 like 0.8B to 9B using the same training techniques
It's always great that more companies are throwing their hat in the ring, especially focusing on value (latency + intelligence + cost)
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
It's a bit odd that they're not comparing it against Sonnet
Did they just upgrade Kimi 2.5 to 2.6?
I don't know why their model isn't on Openrouter yet. They must not have enough capacity to offer it.
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.
Non-x link: https://cursor.com/blog/composer-2-5 (https://news.ycombinator.com/item?id=48182126)
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?