LLM responses for programming questions are displayed with banding in the console

[softwarenerd]

System details:

Positron and OS details:

Positron Dev Version: 2025.03.0 build 0
Code - OSS Version: 1.96.0
Commit: Unknown
Date: Unknown
Electron: 32.2.6
Chromium: 128.0.6613.186
Node.js: 20.18.1
V8: 12.8.374.38-electron.0
OS: Darwin arm64 24.3.0

Interpreter details:

Python 3.11.9.

Describe the issue:

Steps to reproduce the issue:

A picture is worth a thousand words. If I ask GPT-4 to "Write me a Swift program that tells me how many performance cores I have", the output looks like this:

Expected or desired behavior:

It should look like this:

Were there any error messages in the UI, Output panel, or Developer Tools console?

There are no errors.

[petetronic]

Confirmed with this simple example:

from chatlas import ChatOpenAI
import os

# Setup your Open API key in an env var
OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")

def chat_with_chatlas(prompt: str):
    chatlas_client = ChatOpenAI(api_key=OPENAI_API_KEY, model="gpt-4o-mini")
    try:
        response = chatlas_client.chat(prompt)
        return response
    except Exception as e:
        return f"An error occurred: {e}"

prompt = "Write me a simple Swift program that shows me how many performance cores I have"
response = chat_with_chatlas(prompt)