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Cursor IDE users report Grok 4.5 unexpectedly using API models, increasing costs

Users of the Cursor IDE have reported that the Grok 4.5 model appears to be utilizing API calls for various other models, including Opus and Sonnet, rather than exclusively using first-party models as expected. This behavior has led to unexpected increases in API usage costs for some users. The issue suggests that the agents invoked by Grok 4.5 may be drawing from a broader range of models than initially understood. AI

IMPACT Potential for increased operational costs and confusion for users of AI-powered IDEs and tools.

RANK_REASON User reports of unexpected behavior and cost implications in a specific software product.

Read on r/cursor →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Cursor IDE users report Grok 4.5 unexpectedly using API models, increasing costs

COVERAGE [1]

  1. r/cursor TIER_2 English(EN) · /u/dsmitdev ·

    Grok 4.5 triggered API usage instead of First Party Models

    <!-- SC_OFF --><div class="md"><p>Hey all, I opened a case with support but was curious if anybody else has seen this. I ran a pretty massive build prompt today with Grok set to max. While it was running, I noticed my API was ticking lower and lower. I ended up having to add some…