Azure Databricks Claude Opus blocked by Databricks-set rate limit of 0

Alex Kolchinski 0 Reputation points
2026-07-09T22:03:13.8933333+00:00

I created a Premium Azure Databricks workspace in East US 2 to use Databricks-hosted Anthropic models through Foundation Model APIs.

General model serving works: a control request to databricks-gpt-oss-20b returned HTTP 200 with token usage, confirming workspace authentication, networking, and general Foundation Model API functionality.

Anthropic behavior:

  • databricks-claude-opus-4-8 appears READY, but every invocation returns HTTP 403: PERMISSION_DENIED: The endpoint is temporarily disabled due to a Databricks-set rate limit of 0.
  • databricks-claude-sonnet-5 returns the same rate-limit-of-zero error.
  • Metadata lookup for databricks-claude-fable-5 succeeds, but invocation returns HTTP 404 ENDPOINT_NOT_FOUND.
  • The invoking user is an active workspace admin.

The Azure resource is Premium and attached to an enabled Microsoft for Startups Azure Sponsorship subscription. Databricks staff have explained that this exact error can indicate a workspace trust-tier restriction requiring Databricks Support or Sales to move the workspace to PAYABLE_VERIFIED.

Could an Azure Databricks engineer please:

  1. Confirm whether this workspace is in a restricted trust tier and arrange a private escalation to move it to PAYABLE_VERIFIED or grant a non-zero system quota for hosted Anthropic models.
  2. Enable pay-per-token access to Claude Opus 4.8.
  3. Confirm whether Claude Fable 5 is available in East US 2 and enable it if eligible.
  4. Confirm whether this inference is billed through the Azure Databricks Serverless Real-Time Inference DBU meter, and whether that meter draws from Azure Sponsorship credits.

I can provide the subscription ID, Azure resource ID, workspace ID, timestamps, and complete request/response details privately to a Microsoft or Databricks support engineer.

Azure Databricks
Azure Databricks

An Apache Spark-based analytics platform optimized for Azure.

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  1. Srikanth Chavithina 265 Reputation points Microsoft External Staff Moderator
    2026-07-11T05:41:26.0533333+00:00

    Hi @Alex Kolchinski ,

    Thank you for sharing the detailed troubleshooting results.

    Since databricks-gpt-oss-20b can be invoked successfully, the workspace authentication, connectivity, and general Foundation Model API path appear to be functioning correctly. The PERMISSION_DENIED error stating that the endpoint is temporarily disabled due to a Databricks-set rate limit of 0 indicates a Databricks-managed restriction affecting access to those hosted Anthropic models rather than an Azure RBAC, networking, or workspace administrator permission issue.

    The READY status confirms the serving endpoint status, but does not necessarily confirm that the workspace is eligible to invoke the model. Similarly, the 404 ENDPOINT_NOT_FOUND response for Claude Fable 5 should be investigated separately, as the error alone is not sufficient to confirm whether the cause is regional availability, workspace eligibility, or another model-specific restriction.

    Since workspace-specific entitlements, model access restrictions, and Databricks-managed quotas cannot be verified or changed through the Microsoft Q&A forum, I recommend engaging Databricks Support or your Databricks account team. Please provide the workspace ID, Azure resource ID, endpoint names, timestamps, request IDs, and complete error responses so they can investigate the workspace-specific configuration.

    For the billing question, whether these inference charges are eligible to draw from Azure Sponsorship credits depends on the applicable billing configuration and subscription terms. Azure Billing Support and Databricks Support can confirm this for your specific subscription and workspace.

    I hope this information helps. If you have any further questions or need additional clarification, please feel free to let me know.

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  2. Alex Burlachenko 25,120 Reputation points MVP Volunteer Moderator
    2026-07-10T07:27:07.4533333+00:00

    hi Alex Kolchinski & thx for sharing urs issue here at Q&A portal,

    the key error is explicit: Databricks has set the rate limit to 0. That is not an Azure RBAC, networking, or workspace admin permission issue. Since another Foundation Model endpoint works, the workspace/auth path is fine. The Claude endpoints are being blocked by a Databricks-side entitlement or trust-tier control. So this needs Databricks Support or the Databricks account team, not a config change in Azure. Ask them to confirm the workspace trust tier and whether it can be moved to PAYABLE_VERIFIED or granted non-zero hosted Anthropic quota. A few separate points, READY only means the endpoint exists, not that your workspace is allowed to invoke it. The 404 ENDPOINT_NOT_FOUND for Claude Fable likely means that endpoint is not actually available in that region/workspace, even if metadata can be queried.

    Billing and whether Azure Sponsorship credits cover the serverless inference meter should be confirmed by Databricks/Azure billing support. Don’t assume sponsorship covers every marketplace/serverless charge.

    Include the workspace ID, Azure resource ID, endpoint names, timestamps, request IDs, and the exact rate limit of 0 response. There is nothing useful to fix client-side here.

    rgds,

    Alex

    &

    If my answer was helpful pls mark it and additional thx if u follow me at Q&A portal

    and at my blog https://ctrlaltdel.blog/

     

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