Model board / Claude Opus 5

Verified 2026-09-03 against the pages listed below. Prices are USD per 1M tokens, list rate — no committed-use, enterprise or volume discount.

1h cache write $10.00; fast mode $10/$50

full 1M window at standard rates; 128K max output per request

read 0.1x input; 5m write 1.25x, 1h write 2x

Watch out

New tokenizer on 4.7+ yields ~30% more tokens for the same text — re-measure, don't scale the rate

What we would use it for

Long agent runs and hard multi-step reasoning

What this has cost, week by week

Output price at each refresh since 2026-07-30. A vendor change is the provider changing its price. Our correction means this board changed what it prints and the provider's charge did not move — the two are never merged, because publishing the second as the first would be a price rise that never happened.

Where these numbers came from

• https://platform.claude.com/docs/en/about-claude/pricing
• https://platform.claude.com/docs/en/build-with-claude/prompt-caching

No number on this page was written that was not read from one of those pages on 2026-09-03. If one is wrong, send us the source URL and it is corrected in the next weekly refresh, with a changelog line saying what was wrong — contact@naderu.com.

Discussed in Naderu Weekly

• The price has a clock on it — 2026-08-27

The rest of the board

This row sits alongside 53 others on the model board, refreshed every week. The same data as JSON, and the terms for using it, are at /board-data.