The new models, Claude Opus 4 and Claude Sonnet 4, have impressed us, particularly with their capabilities in agentic coding, which we are excited to integrate into Cursor.

The introduction of the 3.5 Sonnet model marked a significant improvement in programming capabilities, enabling Cursor to enhance its features and user experience.

3.5 Sonnet was the first model where we dedicated significant effort to improve coding capabilities, focusing on longer horizon coding tasks.

Recent evaluations of Claude 3.5 Sonnet included human evaluations where participants had to make business decisions based on extensive documentation, testing how an AI assistant could influence their choices.

Testing with version 3.7 of Claude revealed significant improvements in its gameplay, making it much more capable than previous versions.

By combining the intelligence of the 3.5 Sonnet model with custom retrieval models, Cursor can now perform multi-file edits, which has driven mass adoption of the platform.

Opus is a significant advancement over Sonnet, as it understands my intent well and can one-shot many tasks that previous models struggled with.

The community response to Claude Code has been overwhelmingly positive, with many users finding it significantly boosts their productivity.

Dario explicitly said Claude 3.5 Sonnet was trained nine to ten months ago, and it took them another handful of months to release it, indicating a significant gap in the release timeline.