Claude 4 Sonnet rate limit at zero??

I am facing same issue. Not a single request was successful. It happens at arbitrarily low invocation/token rates

    Based on the information available, it appears you're experiencing an issue with rate limiting for Claude 4 Sonnet in Amazon Bedrock. This is similar to issues other users have reported with Bedrock models where they receive "Too many requests" errors even on their first request.

    The issue might be that your quota for Claude 4 Sonnet has been set to 0, which would explain why you're getting 429 errors on every request while Claude 4 Opus works fine. 

    For quota-related issues like this, the recommended approach is to contact AWS Support under "Account and billing." Due to high demand for these models, AWS is prioritizing customers who are actively using their existing quota allocations, which might explain why your support ticket hasn't seen much movement.

    Since you've already filed a ticket (case 174794924600523), you're on the right track. You might want to clarify in your ticket that this appears to be a quota issue where your Claude 4 Sonnet quota may be set to 0, rather than a general rate limit increase request.

    You can check your current quota values in the Service Quotas section of the AWS Console to confirm if this is indeed the case.
  

Sources
Bedrock Claude Sonnet 3.5 v2 - Too many requests, please wait before trying again. | AWS re:Post
Supported foundation models in Amazon Bedrock - Amazon Bedrock