# AI Became More Accurate, Two-Point-Four Times Faster, and More Efficient at Once by Yashodha Bhavnani > "Sonnet 5.5 rechecks data in source documents, catching errors that Sonnet 5 failed to spot. Compared to the last model, Sonnet 5.5 was more accurate, 2.4x faster, and used 12% fewer total tokens." > **— Yashodha Bhavnani**, *Introducing Claude Sonnet 5.5, September 28, 2026* ## Sources and Context - **Direct publication:** [Introducing Claude Sonnet 5.5](https://www.anthropic.com/claude-sonnet-5-5) — published September 28, 2026. - **Exact published statement:** “Sonnet 5.5 rechecks data in source documents, catching errors that Sonnet 5 failed to spot. Compared to the last model, Sonnet 5.5 was more accurate, 2.4x faster, and used 12% fewer total tokens.” - **Context and evidence boundary:** Bhavnani described Box's evaluation for sensitive financial-services and healthcare document workflows. - **Weekly source dossier:** [[research/Weekly Reminder Hunt - 2026-10-02|Weekly Reminder Hunt — October 2, 2026]] preserves the selection rationale and the other authoritative statements reviewed in the same production cycle. ## Related Articles and Collections - **Collection:** [[collections/Simple Reminders|Simple Reminders]] - **Collection:** [[collections/Machine Succession|Machine Succession]] - **Article:** [[articles/The Gigawatt Is the New Measure of War|The Gigawatt Is the New Measure of War]] ## Related Topics - [[wiki/Yashodha Bhavnani|Yashodha Bhavnani]] - [[wiki/AI Access|AI Access]] - [[wiki/Compute Scarcity|Compute Scarcity]] - [[wiki/AI Distribution|AI Distribution]] ## Share on Social Media ``` "Sonnet 5.5 rechecks data in source documents, catching errors that Sonnet 5 failed to spot. Compared to the last model, Sonnet 5.5 was more accurate, 2.4x faster, and used 12% fewer total tokens." — Yashodha Bhavnani, Introducing Claude Sonnet 5.5, September 28, 2026 https://bryantmcgill.com/simple-reminders-bhavnani-ai-became-more-accurate-two-point-four ```