BiWu.AiOpenAI API Pricing (ChatGPT API)
OpenAI publishes official API prices for 7 text models: GPT-6 Astra, GPT-5.5, GPT-5.4, GPT-6 Sol and more. Input costs from $0.10 to $10 and output from $0.50 to $50 per 1M tokens. The lowest output price is GPT-6 Luna at $0.50; the highest is GPT-6 Astra at $50.
Prices checked Oct 10, 2026
Models
7
Lowest output / 1M
$0.50
GPT-6 Luna
Unit
Per 1M tokens
Prices checked
Oct 10, 2026
OpenAI API prices by model
Official prices per 1 million tokens from OpenAI's pricing page. Open a model for every provider and plan we track.
| Model | Input | Output | Cached input | Context window |
|---|---|---|---|---|
| GPT-6 Astra | $10 | $50 | $1 | 1.05M context · 128K output |
| GPT-5.5 | $5 | $30 | $0.50 | — |
| GPT-5.4 | $2.50 | $15 | $0.25 | — |
| GPT-6 Sol | $2 | $10 | $0.20 | 1.05M context · 128K output |
| GPT-5.4 Mini | $0.75 | $4.50 | $0.075 | — |
| GPT-5.4 Nano | $0.20 | $1.25 | $0.02 | — |
| GPT-6 Luna | $0.10 | $0.50 | $0.01 | 1.05M context · 128K output |
OpenAI API pricing FAQ
How much does the OpenAI API cost?
OpenAI's official API charges from $0.10 to $10 per 1M input tokens and from $0.50 to $50 per 1M output tokens across the 7 models listed here. Prices checked Oct 10, 2026.
What is the cheapest OpenAI API model?
GPT-6 Luna has the lowest output price: $0.10 per 1M input tokens and $0.50 per 1M output tokens.
Is cached input cheaper on the OpenAI API?
Yes. 7 of the 7 models listed here have a lower cached-input price. For example, GPT-6 Astra charges $1 per 1M cached input tokens instead of $10.
Is the OpenAI API included in ChatGPT Plus?
No. ChatGPT subscriptions and the OpenAI API are billed separately. The API is pay-as-you-go per token, and ChatGPT plans do not include API credits.
Related pricing
BiWu.Ai lists public API prices from official pricing pages for reference and does not sell API access. Long-context, batch and priority rates can differ, and prices can change without notice. Check OpenAI's pricing page before you build on it.