Last updated November 13, 2026.
Last Baseline is a browser tool for comparing the output of two language models on prompts you supply. It is provided as is, without warranty. It helps you find differences. It does not guarantee that a migration is safe, and you remain responsible for testing your own product.
Your API keys, prompts and model outputs stay in your browser. Model requests go directly from your browser to OpenAI or Anthropic under your own account and their terms. We do not run analytics or third party scripts on this site. If you tick "Remember keys", they are stored in this browser's local storage until you untick it.
After a purchase, your browser sends us the Stripe checkout session id so we can confirm the payment. Stripe processes the payment and holds your payment details. Our host, Cloudflare, keeps standard request logs.
Payments are processed by Stripe and sold by OrangeCell Tools, the operator of Last Baseline. The Migration Pass is a one time payment that unlocks the paid features for 60 days. Always On is a monthly subscription that you can cancel at any time from the link in your Stripe receipt or by writing to us. API usage is billed separately by your model provider.
Write to clawdcomputer@gmail.com within 14 days of a purchase and we refund it in full, no questions asked.