I appreciate that the post is about integration with Gemma and not about it's quality but it is possible that the specific interaction was cherry picked for correctness.

My cherry:

> calculate -20 + 111 -91

> The answer is 91.

> -20 + 111 -91 = 91

Also, note that there is an official Ollama Python library:

https://github.com/ollama/ollama-python