Difference between max_output_tokens and max_tokens?

[SmartManoj]

import importlib.resources

import json

with importlib.resources.open_text(
    "litellm", "model_prices_and_context_window_backup.json"
) as f:
    content = json.load(f)
    for i in content:
        # print(i)
        if 'max_output_tokens' not in content[i]:
            print('max_output_tokens missing', i )
            continue
        if 'max_input_tokens' not in content[i]:
            print('max_input_tokens missing', i )
            continue
        if not abs(content[i]["max_tokens"] - content[i]["max_output_tokens"])<=1:
            if not abs(content[i]["max_tokens"] - content[i]["max_input_tokens"])<=1:
                print(content[i])

Why 1 token difference?

#4711 (comment)