Preference Model vs graftfork

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Preference Model compared with graftfork
Detail	Preference Model	graftfork
What it does	Open-sourcing Karotte, a framework for building robust reinforcement learning environments	Keep your changes on every upstream release
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Open source	Freemium
Pricing	Not given	Free: 10 syncs per month, first conflict resolved free. Premium: $12/month with $6 of agent work included, up to 40 syncs per month, $10 add-ons for $7 of agent work. Team: $15 per fork per month (1-20 forks). Enterprise: by contract.
Key features	Sandboxed execution with non-privileged user isolation Process termination before grading Suspicious file detection and rejection Out-of-memory and fork-bomb prevention Hardened through one million evaluation runs Red-team tested for reward hacking vulnerabilities Scalable environment execution Robust benchmark building support	Automatic change carrying onto new upstream releases Test-driven verification before moving changes AI-powered conflict resolution No write access to your repository Automatic test discovery for Python and Node projects Program rebuilding from specification documents Early warning system for upcoming releases Signed records of every sync with verification Support for GitHub, GitLab, Codeberg and any git host Organization-level team management with audit logs
What makes it different	Provides secure defaults and primitives specifically designed to prevent reward hacking in RL training Hardened through real-world testing at scale with over one million evaluation runs Designed for training environments where defenses must withstand continuous optimization attempts Addresses AI alignment at the highest leverage point through better environment construction Built and tested internally by frontier AI research team	Never moves you onto code that fails your tests Keeps your branch untouched until you decide to take a move No overage charges on Premium and Team plans Tested with real GitHub forks and Debian/Ubuntu release history
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	29 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	11	0
Citation Flow (Majestic)	24	0
Referring domains (Majestic)	98	0

4 details filled in for both companies.

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