Ask HN: Does this estimate for GPT-4's 128k token window make sense?

GPT-4 supports a 128,000-token context window (per OpenAI).

I'm trying to understand how much text that really is. Here's my rough estimate:

1 token ≈ ¾ word ≈ 4 characters

A single-spaced A4 page (12pt font) ≈ 500–600 words → ~700–800 tokens

128,000 ÷ 800 = ~160 pages

So: GPT-4 can handle ~150–190 A4 pages of standard English prose, depending on formatting.

Does that sound accurate?