The detail
The quick answer: 1,000 English words is approximately 1,333 tokens. The reverse also helps — 1,000 tokens is about 750 words — so a 1,000-word article comfortably fits in even small context windows but is worth counting for cost.
At current API prices, 1,333 input tokens costs a fraction of a cent on most models, but multiplied across thousands of requests it becomes a real line item. The cost calculator on the homepage projects monthly spend from a single prompt.
If your 1,000 words include code blocks, tables, or heavy punctuation, the token count climbs — often to 1,500 or more — because those characters tokenize less efficiently than prose. Count the real text for budgeting.