Serno
Serno's angle is running one hard question through several models playing different expert roles and showing where they disagree, which is a sound way to pressure-test a strategy decision. The problem in October 2026 is signal of life: the site blocks automated reading, and the founders' Y Combinator profile has been rewritten for a different company, Ovlo, a recruiting service. Try it only after the live site loads and the pricing page shows a current date or changelog.
Pros
- Runs the same question across Claude, GPT and Gemini rather than locking into one model
- Surfaces disagreement between models instead of hiding it behind one blended answer
- Canvas format is exportable and shareable, not just a chat log
Cons
- The vendor site could not be read today; price and feature claims rest on third-party listings
- The founders' YC profile now describes a different product, so continued development is uncertain
- Multi-model debate on every question is slower than a single-model chat for simple lookups