Cheapest GPT-5.6 Luna API: RunAPI is 94% below the official price
GPT-5.6 Luna costs $0.200/$1.20 per 1M tokens from OpenAI. The cheapest quote is RunAPI: $0.012 in, $0.072 out. Full table and buying checklist below.
| # | Provider | 1M input | 1M output | Discount | Tokens per $100 |
|---|---|---|---|---|---|
| — | Official list | $0.200 | $1.20 | 0% | 273M |
| 1 | $0.012 | $0.072 | −94% | 4.55B | |
| 2 | $0.014 | $0.084 | −93% | 3.90B | |
| 3 | $0.030 | $0.180 | −85% | 1.82B | |
| 4 | $0.032 | $0.180 | −85% | 1.76B | |
| 5 | $0.040 | $0.240 | −80% | 1.36B | |
| 6 | $0.147 | $0.881 | −27% | 371M |
Tokens per $100 assume a “code” mix: 5 input tokens per output token. Prices are crawled; verify them on the provider page before buying.
What to check before buying
- Test the key with the free API checker — it verifies the endpoint responds, without sending tokens.
- Compare the blended cost for your workload, not just the input price: output tokens dominate in agent workloads.
- Check uptime and minimum top-up: the cheapest provider is useless if it is down half the day.