A user on Reddit reported unexpectedly high billing charges from the AI coding assistant Cursor, amounting to $187 in overages on top of their $20 monthly subscription. This occurred because Cursor defaulted to using the user's personal OpenAI API key after exceeding fast request limits, leading to significant, unnoticed costs. The user found that routing requests through a custom API endpoint, even with the same models like GPT-5.5 and Opus 4.8, drastically reduced their monthly API expenses to around $15. AI
IMPACT Highlights potential hidden costs for users of AI-powered coding assistants that leverage personal API keys.
RANK_REASON User-reported issue with a specific AI-powered tool.
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