hi @aniket_mullur Thank you for the post!
I checked the affected run. The earlier Claude calls were made by general-purpose Task subagents, not the Explore subagent. The Grok 4.5 parent explicitly selected Sonnet 5 and Opus 5 for those tasks.
When delegating work, the parent agent can choose the subagent type and model it considers the best fit for that specific task. The Explore subagent model setting only controls tasks launched specifically as Explore subagents. It does not apply to every general-purpose Task subagent, so your Explore setting was not overridden in this run.
The Claude calls consumed your included Other Models allowance, but they did not generate an on-demand charge. The Request ID you shared is from the later Grok-only portion of the session.
If you see an Explore subagent use a model other than the one configured for Explore, please share the Request ID from that affected parent turn and we can investigate it.
I wrote up a post here explaining some ways to better control subagent model usage: Subagent Allowed Models - #7 by kevinn