GPT-5 Pro API pricing
As of October 21, 2026, OpenAI GPT-5 Pro costs $15.00 per million input tokens and $120.00 per million output tokens on OpenAI's own API.
- Input, per million tokens$15.00
- Output, per million tokens$120.00
- Cached input, per millionNo cache price listed
- Context window400K tokens
- Max output128K tokens
- Output speedNot measured
What a request costs
Three fixed token mixes at the list price, without cache or batch discounts. For a whole month, use the calculator.
| Workload | Tokens | One request | 1,000 requests | Fits the context window |
|---|---|---|---|---|
| Chat turn | 1K input + 500 output tokens | $0.075 | $75.00 | Yes |
| Repository review | 50K input + 3K output tokens | $1.11 | $1110.00 | Yes |
| Agent loop | 200K input + 10K output tokens | $4.20 | $4200.00 | Yes |
| Solved coding task | One SWE-bench Verified attempt, divided by the share that succeed | Not computable | Not computable |
Price history
We have read OpenAI's own price every day since October 21, 2026. It has not changed yet; any change will be listed here with its date.
- October 21, 2026 First recorded: $15.00 input, $120.00 output
Cheaper models as good as GPT-5 Pro
GPT-5 Pro has no overall or coding score, so we make no quality claim against it.
GPT-5 Pro pricing questions
- How much does GPT-5 Pro cost per million tokens?
- $15.00 per million input tokens and $120.00 per million output tokens, as listed on OpenRouter on October 21, 2026.
- Does GPT-5 Pro support prompt caching?
- OpenRouter lists no cached input price for this model, so assume every input token is billed at the full rate.
- Has the price of GPT-5 Pro changed?
- Not since we started recording it daily on October 21, 2026.