The Brain score has been in the product since day one. Today it gets its first meaningful update.
The weights are the same: 40% recall, 30% calibration, 30% explain-back. What's changed is the calibration component. We now use a proper Brier-style calculation that accounts for the full distribution of confidence-outcome pairs, rather than the simpler binary comparison we shipped v1 with.
For most users the score won't move noticeably. For users with systematic over- or under-confidence, the new calibration score reflects the pattern more honestly. That is what it is supposed to do.
The share card has also been redesigned. Bigger number. Better typography. A weekly delta that reads at a glance. Share it, or just save it for yourself.
Filed by Product team on Mar 5, 2026. Under Product.