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A 429 error with the message “Concurrency limit reached for requests” means you’re sending too many concurrent requests to the W&B Inference API.

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Why this happens

W&B Inference enforces concurrency limits to ensure fair usage and service stability. When the number of simultaneous requests from your account exceeds the allowed limit, additional requests are rejected with a 429 status code.

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What you can do

  1. Reduce concurrent requests
    • Implement request queuing or throttling in your application
    • Use exponential backoff when retrying failed requests
  2. Increase your limits
    • Review your plan’s concurrency limits and upgrade if needed
For more information, see Usage information and limits.
Quotas & Rate Limits