Free models on OpenRouter do not automatically convert to paid. If a free model becomes unavailable or is canceled, OpenRouter may fallback to a paid model like Claude 3.7 Sonnet, which consumes credits. The model name change and your client using an old model name can trigger this fallback. To prevent charges, specify provider routing to disable fallbacks or restrict providers. If this happens unexpectedly, delete your API key and contact OpenRouter support.
Why is my free Qwen3 model on OpenRouter consuming credits and falling back to a paid Claude 3.7 Sonnet model?
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