GPT 6 Luna API pricing
OpenAI · chat model · 922K context · ranked #273 of 1861 by input price
What GPT 6 Luna costs in practice
GPT 6 Luna is priced at $0.1 per million input tokens and $0.5 per million output tokens , with cached input billed at $0.01 per million — roughly 90% cheaper than fresh input, which matters if your app resends a large system prompt. Against the median priced chat model ($0.5/1M in), this sits at 5.00× cheaper.
Monthly cost examples
Assuming 1,200 prompt + 400 completion tokens per request unless noted, billed 30 days a month and without cache hits.
| Workload | Cost / month | Cost / day |
|---|---|---|
| 1,000 requests/day | $9.6 | $0.32 |
| 10,000 requests/day | $96 | $3.2 |
| 100,000 requests/day | $960 | $32 |
| 1M summaries/month | $949.99 | $31.67 |
Model a different profile in the cost calculator.
Capabilities
Provider description
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic...
Cheaper alternatives
Ranked by blended cost (3× input + 1× output) — cheaper, but check context and capabilities before switching.
| # | Model | Provider | Input $/1M | Output $/1M | Cached $/1M | Context |
|---|---|---|---|---|---|---|
| 1 | Gemini Exp 1114 | Google Gemini | free | free | — | 1.0M |
| 2 | Gemini Exp 1206 | Google Gemini | free | free | — | 2.1M |
| 3 | Gemma 3 27b It | Google Gemini | free | free | — | 131K |
| 4 | Gemma 4 26b A4b It | Google Gemini | free | free | — | 262K |
| 5 | Gemma 4 31b It | Google Gemini | free | free | — | 262K |
| 6 | Learnlm 1.5 Pro Experimental | Google Gemini | free | free | — | 33K |
Data provenance
This page is assembled from the sources below. Where two sources disagree, both are shown.
- Our input price: $0.1
- Second source: —
- Our output price: $0.5
- Second source: —
More from OpenAI
Frequently asked
› How much does GPT 6 Luna cost per 1,000 tokens?
About $0.0001 for input and $0.0005 for output tokens, based on the per-million rates on this page.
› Is GPT 6 Luna cheaper than other models?
By input price it ranks #273 of 1861 priced chat models in this index, putting it in the cheaper half of the market.
› How often is GPT 6 Luna's price checked?
The dataset was last refreshed 2026-09-23 00:10 UTC. Providers can change pricing at any time — verify with OpenAI before committing to a budget.