Models with the :free suffix (e.g. google/gemini-2.5-flash-preview:free)
are served at no charge by OpenRouter. The cost estimator now returns
$0.00 for these models instead of falling through to the conservative
$10/$30 per-million-token fallback.
No changes needed in the model picker or provider — :free models use
the same API endpoint and already appear in the registry.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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