OpenAI API pricing
How OpenAI API charges, what to know before you commit, and what you'd pay at your usage — next to what the alternatives would cost for the same thing.
How it charges
Checked 2026-10-03 on developers.openai.com ↗ · USD, list pricesIn short
Pay per token, from $0.10 / $0.50 per million input/output tokens on GPT-6 Luna to $10 / $50 on GPT-6 Astra.
- Free plan
- Yes
- Side project
- $1.00/mo GPT-6 Luna
- Growing
- $10/mo GPT-6 Luna
- Scaling
- $200/mo GPT-6 Luna
What the model leaves out
Standard-tier prices for short context (the page doesn't state the cutoff for GPT-6 models; older models switch at 272K input tokens); long-context requests cost more (Astra $20 / $75, Sol $4 / $15, Luna $0.20 / $0.75 per million). Batch is half price; cached input is billed lower.
Before you commit
- Long-context requests cost more: Astra $20 / $75, Sol $4 / $15 and Luna $0.20 / $0.75 per million tokens.
- Cache writes cost 1.25× the input price.
- Regional (data-residency) endpoints add 10% for models released on or after March 5, 2026.
- Built-in tools are billed on top of tokens, e.g. file search at $2.50 per 1,000 calls plus $0.10/GB per day of storage after 1 GB free.
| Plan | Monthly fee | Input tokens per month | Output tokens per month |
|---|---|---|---|
| GPT-6 Astra | None | $10 per million tokens | $50 per million tokens |
| GPT-6.1 Sol | None | $2 per million tokens | $10 per million tokens |
| GPT-6 Luna | None | $0.1 per million tokens | $0.5 per million tokens |
What you'd pay
GPT-6 Luna50 million tokens × $0.1 per million tokens + 10 million tokens × $0.5 per million tokens$10/mo
Cost as you grow
All LLM API pricing, compared →Which one fits your situation →