Paste the original and the revised version — the engine produces a full redline: every change, who it favors, and what to push back on.
Choose your AI engine
Standard engine
Opus 5
Anthropic's flagship — the engine every free preview and default report runs on.
Standard engine
ChatGPT 5.6 Sol
OpenAI's flagship, side by side with Opus 5 — pick either for your full report.
Nuclear option
Fable 5
Anthropic's premium Mythos-class engine — the deepest pass the platform offers.
Every engine runs inside the same governed pipeline — the citation cage, the audit trail, and the spend controls are identical — and produces automated findings, not legal advice. Your free preview always runs on Opus 5; the engine you choose runs your full report. On the firm workstation the same three engines drive attorney-supervised drafting and review, with Fable 5 as a premium per-document tier.