The model powering the assistant can vary based on internal routing and ongoing experimentation with different providers. Document and spreadsheet attachments — DOCX, CSV, and XLSX — are converted to text before reaching the model, so there's no reason support should depend on which model is active. These formats now work consistently across every model, so uploads keep working smoothly as we continue experimenting with model options behind the scenes. Image and PDF attachments still depend on specific model support, since those are sent directly as binary data.
