Ollama's default quantization is q4_0 which is quite bad, but you can go to ollama's model page to see all the quantizations they have available, you can do e.g

Ollama's default quantization is q4_0 which is quite bad, but you can go to ollama's model page to see all the quantizations they have available, you can do e.g. "ollama run qwen2.5-coder:32b-instruct-q8_0" which will need ~35G + space for context