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Cursor IDE fails to adhere to sub-agent model instructions, increasing costs

Users of the Cursor IDE are experiencing issues with the application's sub-agent model instructions being ignored, leading to unexpected costs. Despite explicit commands to use specific models like Grok 4.5 High for sub-agents, Cursor sometimes defaults to launching more expensive Fable 5 agents or even Composer 2.5 Fast. This behavior is causing frustration and financial strain for users who are seeking a reliable method to enforce model selection for sub-agents. AI

IMPACT Potential for increased costs and workflow disruptions for users relying on specific AI models within development tools.

RANK_REASON User-reported issue with a specific software product.

Read on r/cursor →

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

Cursor IDE fails to adhere to sub-agent model instructions, increasing costs

COVERAGE [1]

  1. r/cursor TIER_2 English(EN) · /u/RoDev455 ·

    Cursor keeps ignoring my sub-agent model instructions and it’s costing me a fortune

    <!-- SC_OFF --><div class="md"><p>When I use Cursor, I often ask the main agent to launch sub-agents to explore different parts of the codebase and report back with their findings.</p> <p>For example, I’ll explicitly tell Fable 5: <em>&quot;Only use Grok 4.5 High when launching s…