Best and Most Cost-Effective LLM for Heavy Multi-File Tutoring?
Initial_Appeal_7382 · reddit · 2026-08-08
A user is seeking advice on choosing an LLM to act as a strict German professor to help finish a textbook within a specific timeframe. The use case is highly demanding: it requires simultaneous reference to multiple PDFs (textbooks, workbooks, transcripts, answer keys), 2 hours of heavy daily multi-turn interaction, and complex instructions (anti-tangent protocols, batch processing, cross-session error logging, and exam generation/grading).
The author asks three main questions:
- Which model (e.g., Claude 3.5 Sonnet, GPT-4o, Gemini 1.5 Pro) handles large document retrieval or massive native context windows accurately without hallucinating during language grading?
- Will a standard $20/month subscription hit message limits too quickly due to heavy daily uploads of large attachments?
- Would an API pay-per-token setup or a local open-source model (like Llama 3) be more cost-effective for this daily tutoring?
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