Update quotas-limits.md

Author: eric-urban

articles/ai-services/openai/quotas-limits.md

@@ -51,6 +51,7 @@ The following sections provide you with a quick guide to the default quotas and
 | GPT-4o max images per request (# of images in the messages array/conversation history) | 10 |
 | GPT-4 `vision-preview` & GPT-4 `turbo-2024-04-09` default max tokens | 16 <br><br> Increase the `max_tokens` parameter value to avoid truncated responses. GPT-4o max tokens defaults to 4096. |
 | Max number of custom headers in API requests<sup>1</sup> | 10 |
+| Max number requests per minute<br/><br/>Current rate limits for realtime audio (`gpt-4o-realtime-preview`) are defined as the number of new websocket connections per minute. For example, 6 request per minute (RPM) means 6 new connections per minute. At this time, the usage limits for `gpt-4o-realtime-preview` are suitable for test and development. | 6 new connections per minute |
 
 <sup>1</sup> Our current APIs allow up to 10 custom headers, which are passed through the pipeline, and returned. We have noticed some customers now exceed this header count resulting in HTTP 431 errors. There is no solution for this error, other than to reduce header volume. **In future API versions we will no longer pass through custom headers**. We recommend customers not depend on custom headers in future system architectures.