# RSA-896 Factored in 2026

> Claude factored RSA-896 using 2048 GPUs in 10 days
- Title: RSA-896 Factored in 2026 · Saweis | Shortify
- Summary: Claude factored RSA-896 using 2048 GPUs in 10 days RSA-1024 keys vulnerable to GPU fleets rsa-896, claude, gpu · reported by Saweis.
- Keywords: rsa-896, claude, gpu, general number field sieve, rsa-1024, anthropic, cado-nfs, technology, startups, Factored, 2026, Saweis
- Source: Saweis — https://saweis.net/posts/rsa-896.html
- Read time: 1 min
- Topics: rsa-896, claude, gpu, general number field sieve, rsa-1024, anthropic, cado-nfs, technology, startups
## What is RSA-896?
Stephen Weis factored RSA-896 with Claude on September 19, 2026

> RSA-896 is a RSA challenge number I factored with Claude on September 19, 2026
## How was it done?
Claude ported CADO-NFS to run on GPUs for 2048 GPU fleet

> Claude was used to port CADO-NFS to run on GPUs
## What did it show?
RSA-1024 keys vulnerable to data center GPU fleets

> It demonstrates that RSA-1024 keys are vulnerable to many actors with data center-level fleets of GPUs
## Why doesn't it matter?
RSA-2048 keys remain secure despite the work

> It does not impact the security of deployed RSA-2048 keys
## What's next?
More details on the computation and results to follow

> More details will follow
## Key takeaway

RSA-1024 keys vulnerable to GPU fleets