OpenAI API · verified September 25, 2026
GPT-5.5 pro API pricing: $30 in / $180 out
Most expensive model in this table.
Input /1M$30
Output /1M$180
Context1.05M
Released2026
What real jobs cost
| 1,000 short chats | $96.00 |
| Summarise 100 long reports (20k tokens each) | $78.00 |
| Write a 90,000-word book | $22.20 |
| 10M input + 2M output tokens | $660.00 |
Estimates at the listed price. Use the calculator for your own numbers.
Similar-priced models
| Model | In | Out |
|---|---|---|
| GPT-5.6 Sol OpenAI | $4 | $20 |
| Claude Opus 5.5 Anthropic | $4 | $20 |
| Claude Opus 5 Anthropic | $5 | $25 |
| Claude Opus 4.8 Anthropic | $5 | $25 |
| GPT-6 Astra OpenAI | $10 | $50 |
| Claude Fable 5.1 Anthropic | $10 | $50 |
Price history
No price or plan changes recorded since we started tracking. We re-check every week.
Other OpenAI models
- GPT-6 Astra $10 / $50
- GPT-6 Sol $2 / $10
- GPT-6 Luna $0.10 / $0.50
- GPT-5.6 Sol $4 / $20
- GPT-5.6 Terra $2 / $12
- GPT-5.6 Luna $0.20 / $1.20
- GPT-5.4 nano $0.20 / $1.25
GPT-5.5 pro pricing questions
How much does GPT-5.5 pro cost?
$30 per million input tokens and $180 per million output tokens, with a 1.05M context window. Most expensive model in this table.
How much does 1,000 chats cost on GPT-5.5 pro?
About $96.00, assuming 800 input and 400 output tokens per chat.
Is there a cheaper alternative to GPT-5.5 pro?
GPT-6 Astra ($10 / $50) costs about 70% less on a typical 3:1 input/output mix. Test whether its quality is enough for your task.
Sources
Checked against the official pages below on September 25, 2026. Prices are USD before local tax. See how we verify prices and the change log.