AI, by the numbers
What Fits in a Context Window
See a 128K, 1M or 2M-token context window in books you actually know.
tokens
The insight
1,000,000 tokens ≈ 750,000 words — enough to hold War and Peace.
What fits
- ✓This sentence, ~50××1500
- ✓A long blog post×375
- ✓The Great Gatsby×15
- ✓Harry Potter & the Sorcerer's Stone×9
- ✓An average novel×8
- ✓The Lord of the Rings (trilogy)481,000 w
- ✓War and Peace587,000 w
- —The King James Bible783,000 w
- —Shakespeare, complete works885,000 w
How this works
A token is roughly ¾ of an English word, so a context window in tokens becomes a word count you can compare to books you know. “Fits” means the whole text would land inside the window at once — though in practice you leave room for the model's reply.
Word counts are approximate published figures. The point isn't precision; it's scale — a 1M-token window swallowing multiple novels is a very different thing from an 8K window that barely holds a blog post.