Cursor's Bugbot is now over 3x faster and 22% cheaper, powered by Composer 2.5

Cursor shipped a significant update to Bugbot on June 10, 2026, making its automated code review agent more than three times faster, 22% cheaper to run, and 10% more effective at catching bugs. The improvements arrive alongside two new workflow features: a pre-push /review slash command and an incremental review mode that focuses only on what's changed since the last scan.

What's new

The performance gains break down as follows:

• Speed: Bugbot now completes 90% of runs in under three minutes, down from what was often a five-to-ten minute wait.
• Cost: Runs are 22% cheaper, reducing the economic barrier for teams running high-frequency reviews.
• Coverage: Bugbot finds 10% more bugs per review compared to the previous version.

The underlying driver is Composer 2.5, Cursor's updated coding model that now powers Bugbot after recent training improvements. The harness infrastructure was also overhauled to reduce latency.

New workflow additions:

• /review before pushing: Developers can now invoke /review in the Cursor editor before opening a pull request. The command prompts a choice of agents — Bugbot, Security Review, or both — via /review-bugbot or /review-security shortcuts. If the same diff later becomes a PR, Bugbot detects the match, skips the redundant review, and leaves a comment noting it already reviewed that diff.
• Incremental review: Bugbot can be configured to only flag issues introduced since the last review, keeping feedback scoped to new changes rather than re-surfacing already-known issues.

The update is available in Cursor 3.7 and above, and on cursor.com/agents. CLI support is listed as coming soon.

Context

Bugbot launched as Cursor's automated PR review product, sitting in a competitive market alongside GitHub Copilot code review, CodeRabbit, and similar tools. The product previously required a separate subscription; recent changes expanded access to individuals and teams. A May 2026 update adjusted pricing tiers before this performance overhaul.

Composer 2.5 is the second generation of Cursor's in-house coding model, following Composer 2.0 which shipped earlier in 2026. Training improvements to the underlying model have cascading effects across Cursor's products, of which Bugbot is one of the most computationally intensive.

Why it matters

Speed and cost have been the practical blockers to making AI code review a default step in every PR workflow. A five-minute review is easy to skip; a two-minute review is not. The 90% sub-three-minute benchmark moves Bugbot closer to feeling synchronous with the coding workflow rather than an async background job. Combined with the pre-push /review command, Cursor is repositioning Bugbot from a PR-gate tool to something developers run before they even open the request — a meaningful shift in where AI review fits in the development cycle.