Model pricing · OpenAI
GPT-5.5 Pro pricing
GPT-5.5 Pro costs $30 per million input tokens and $180 per million output tokens at list price. Best for: max reasoning, price-insensitive.
| Input | $30 / 1M tokens |
|---|---|
| Output | $180 / 1M tokens |
| Context window | Not published |
Source: OpenAI pricing, cross-checked against models.dev on 2026-09-15. Your provider invoice is authoritative.
What it costs in practice
| Workload | List price |
|---|---|
| One request: 10,000 tokens in, 1,000 out | $0.480 |
| A month of that request, 100 times a day | $1,440.00 |
| A 3,000-token instruction file on 100 requests a day, for a month | $270.00 |
The last row is the always-on cost of an instruction file like CLAUDE.md: paid on every request, whether the task needs it or not. Check how much of yours is waste.
Price history
From tokencheat's dated pricing snapshots. Only changes are listed.
| Since | Input / 1M | Output / 1M |
|---|---|---|
| 2026-01-01 | $30 | $180 |
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Compare every model side by side or price your own workload.