I had Claude port CADO-NFS to run on GPUs. Then it orchestrated a fleet to run on scavenged idle capacity. It ran with a max of 2048 GPUs for about of 30 GPU-years over 10 days.
I asked Claude if it had a message for a public: “The credit belongs first to the people who built the number field sieve and CADO-NFS over several decades, and to the teams who set the earlier records. This run used their algorithm and much of their code.”
Also to clarify:
- No new algorithmic factoring improvements.
- It’s still exponential.
- No new threats to deployed keys.
If you've already paid for and reserved a whole cluster of GPUs, any idle capacity is capacity you've already paid for. Using it is effectively free. So might as well use it to solve fun math puzzles.
Though, it would make more financial sense to mine crypto.
But Anthropic isn't paying for the electricity and cooling. They don't run their own data centers, they rent compute from providers who cover those costs.
That's entirely why they can blow compute on the fun projects like this. If they had to pay extra for the electricity, they wouldn't do it.
Most of the GPU cost is in the GPUs themselves (and in the space and maintenance costs of the building). Electricity is a small fraction, and it's not like datacenters are just going to shut down their servers when they're not in use.
There is cost, but the cost is mostly the opportunity cost of not being able to do something else.
How much crypto do you think the mentioned 30 GPU years would have produced at current exchange rates? They're not as efficient as ASICs but GPU's can still mine a lot...
If you break one though be careful when redeeming it, there are bots set up to pounce and steal the coins when they are transacted because the reduced entropy makes that possible. You need to submit the transaction to a mining pool that will not broadcast it until it is mined.
More details: https://x.com/sweis/status/2101484464807596264
More details: https://archive.li/20260920025515/https://x.com/sweis/status...
> It’s still exponential
It's actually subexponential: https://en.wikipedia.org/wiki/General_number_field_sieve?wpr...
I misspoke and corrected down thread.
…but super-polynomial.
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https://xxcancel.com/sweis/status/2101484464807596264
If you've already paid for and reserved a whole cluster of GPUs, any idle capacity is capacity you've already paid for. Using it is effectively free. So might as well use it to solve fun math puzzles.
Though, it would make more financial sense to mine crypto.
Only if you pay a flat rate for electricity and cooling.
But Anthropic isn't paying for the electricity and cooling. They don't run their own data centers, they rent compute from providers who cover those costs.
That's entirely why they can blow compute on the fun projects like this. If they had to pay extra for the electricity, they wouldn't do it.
5 replies →
Most of the GPU cost is in the GPUs themselves (and in the space and maintenance costs of the building). Electricity is a small fraction, and it's not like datacenters are just going to shut down their servers when they're not in use.
There is cost, but the cost is mostly the opportunity cost of not being able to do something else.
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> it would make more financial sense to mine crypto
GPUs are power-inefficient for mining most crypto so not necessarily. You may end up paying more in electricity than you are able to mine.
Most crypto mining is on ASICs now.
You missed the part where they have already pre-paid for the GPU-hours and they pay the same regardless of he electricity used.
Also, even if they were paying for electricity, they would lose less money mining crypto than factoring RSA numbers.
How much crypto do you think the mentioned 30 GPU years would have produced at current exchange rates? They're not as efficient as ASICs but GPU's can still mine a lot...
wouldn't even cover the cost of power and cooling otherwise everyone would still be doin it
kinda bearish for the data center rollouts if the spare compute can be used to solve math puzzles instead of training LLMs
Enjoy the bounty
There is no bounty, RSA labs ended the $75,000 reward in 2007.
There's about 900 BTC remaining for anyone who breaks these keys:
https://privatekeys.pw/puzzles/bitcoin-puzzle-tx
If you break one though be careful when redeeming it, there are bots set up to pounce and steal the coins when they are transacted because the reduced entropy makes that possible. You need to submit the transaction to a mining pool that will not broadcast it until it is mined.
5 replies →