openai
OpenAI: GPT-5.6 Luna API Pricing
OpenAI: GPT-5.6 Luna costs $0.200 per 1M input tokens and $1.20 per 1M output tokens (cache reads: $0.020). Context window: 1.1M. Prices verified 2026-08-23 · source
Input / 1M tokens
$0.200
Output / 1M tokens
$1.20
Context window
1.1M
Max output
128K
What would OpenAI: GPT-5.6 Luna cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $6.40 |
| Coding agent | 5,000 | 8,000 / 2,000 | $20.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $42.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $10.40 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About OpenAI: GPT-5.6 Luna
GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...