openai
OpenAI: GPT-5 Pro API Pricing
OpenAI: GPT-5 Pro costs $15.00 per 1M input tokens and $120.00 per 1M output tokens. Context window: 400K. Prices verified 2026-08-23 · source
Input / 1M tokens
$15.00
Output / 1M tokens
$120.00
Context window
400K
Max output
128K
What would OpenAI: GPT-5 Pro cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $600.00 |
| Coding agent | 5,000 | 8,000 / 2,000 | $1800.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $3600.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $840.00 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About OpenAI: GPT-5 Pro
GPT-5 Pro is OpenAI’s most advanced model, offering major improvements in reasoning, code quality, and user experience. It is optimized for complex tasks that require step-by-step reasoning, instruction following, and...