requirements.txt

# Flask
flask>=3.0,<4.0

# Env loading
python-dotenv>=1.0

# HTTP / LLM
requests>=2.31
openai>=1.40

# LangChain stack (RAG)
langchain-core>=0.3
langchain-community>=0.3
langchain-openai>=0.2
langchain-huggingface>=0.1

# Embeddings backends
sentence-transformers>=3.0
faiss-cpu>=1.8

# Data / math
pandas>=2.0
openpyxl>=3.1
sympy>=1.12
numpy>=1.26
matplotlib>=3.8