Gif Prompts Omni Search Tool Caching And Byok Flags

OpenRouter added a way to confirm whether an API request used the developer's own provider credentials. When usage reporting is requested, the response includes an is_byok flag, identifying whether the bring-your-own-key setup was used. This gives developers a check on what happened to a particular request, rather than relying solely on their account configuration. The behavior is described in the announcement's usage-reporting section.