> ## Documentation Index
> Fetch the complete documentation index at: https://docs.runbridge.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Interface stability

> Understand request, token, and image throughput metrics and handle RunBridge AI rate-limit responses.

## Understand throughput metrics

* **RPM (requests per minute)**
  The number of requests that can be processed per minute.

* **IPM (images per minute)**
  The number of images that can be processed per minute.

* **TPM (tokens per minute)**
  The number of tokens that can be processed per minute.

***

## Handle rate-limit responses

Control concurrency before sending requests. If you receive `429`, retry with exponential backoff and jitter, then reduce burst traffic if the responses continue.

See [Handle rate limits and concurrency](/guides/rate-limits-and-concurrency) for examples, and use the [model catalog](/overview/models) to select model IDs.

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