Degraded performance on Opus 4.7 model

Update timeline

1. investigating Apr 20, 2026, 07:47 AM UTC

   We are investigating an issue where Opus 4.7 may occasionally generate unexpected system-style messages (for example, comments about whether code is “malicious” or “benign”) even when working with normal, non-malicious content. In some cases, this may cause the model to pause or fail to complete a task. This behavior does not indicate any security risk. It is a formatting issue in the model’s output and does not affect your project files or data. Our team is actively working on a fix. In the meantime, users can switch to Opus 4.6 or Sonnet if they encounter this behavior. We will provide updates as soon as more information is available.

2. identified Apr 20, 2026, 11:03 AM UTC

   We've identified the issue and are working on a fix.

3. monitoring Apr 20, 2026, 03:13 PM UTC

   We've deployed a fix and are monitoring the solution.

4. resolved Apr 21, 2026, 09:23 AM UTC

   This issue has been resolved.