Model board / GPT-5.5
GPT-5.5
previous OpenAIVerified 2026-10-22 against the pages listed below. Prices are USD per 1M tokens, list rate — no committed-use, enterprise or volume discount.
above 272K input tokens the whole session bills at 2x input and 1.5x output: $10.00/$1.00/$45.00
stated on the model's own page
implicit breakpoints only, every 2,048 tokens; no explicit breakpoints and no cache-write charge; the minimum prefix "varies by request settings"
Watch out
Dearer than every GPT-5.6 and GPT-6 row except Astra on output ($30.00), with an older caching scheme. Nothing on OpenAI's pages recommends it; it remains for code that pinned it
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
No number on this page was written that was not read from one of those pages on 2026-10-22. 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 clock is now part of the bill — 2026-08-14
The rest of the board
This row sits alongside 76 others on the model board, refreshed every week. The same data as JSON, and the terms for using it, are at /board-data.