| Input per 1M tokens | $0.1 |
| Output per 1M tokens | $0.5 |
| Cache read per 1M tokens | — |
| Status | active |
| Source | official pricing page · verified 2026-10-26 |
Added 2026-10-13 from OpenAI's pricing page.
Example costs
- One request (2,000 in / 500 out): $0.0004
- 100K such requests/month: $45
- 1M input + 1M output tokens: $0.6
Compare against other models →
How GPT-6 Luna compares on rate
GPT-6 Luna runs $0.1 input / $0.5 output per MTok — a combined $0.6 for 1M tokens each way. The cheapest active model in our table, Gemini 2.5 Flash-Lite at $0.1/$0.4 (combined $0.5), is about 17% cheaper on combined rate (verified 2026-10-26).
Per-token rate is not per-task cost — tokenizers differ between model families, so benchmark with your own payloads before switching.
What real volumes cost at GPT-6 Luna rates
Straight rate-card math at the verified $0.1/$0.5 per-MTok prices, assuming a 75% input / 25% output token split — no caching or batch discounts applied.
| Volume | Split | Cost at GPT-6 Luna rates |
|---|---|---|
| 100K tokens in a day | 75,000 in + 25,000 out | $0.0200 |
| That pace over a 30-day month (3M tokens) | 2.25M in + 750K out | $0.6000 |
| 1M tokens in a month | 750,000 in + 250,000 out | $0.2000 |
| Heavy month — 12M tokens | 9M in + 3M out | $2.40 |
Change the split or volume in the calculator — same verified rates, your numbers. Method + the corrections that make estimates real: how to estimate LLM API costs.
Frequently asked questions
What does GPT-6 Luna cost per million tokens?
GPT-6 Luna costs $0.1 per 1M input tokens and $0.5 per 1M output tokens on the OpenAI API (verified 2026-10-26).
How much does 100K tokens a day cost on GPT-6 Luna?
At a 75% input / 25% output split, 100K tokens costs about $0.0200 at GPT-6 Luna rates — about $0.6000 over a 30-day month. That is straight rate-card math, before any caching or batch discounts.
Is there a cheaper model than GPT-6 Luna?
Yes — the cheapest active model we track is Gemini 2.5 Flash-Lite at $0.1/$0.4 per MTok, a combined $0.5 against GPT-6 Luna's $0.6 — about 17% less on combined rate (verified 2026-10-26). Tokenizers differ between families, so benchmark per-task cost with your own payloads.
How much do 1M input + 1M output tokens cost on GPT-6 Luna?
$0.6 — $0.1 for the input million plus $0.5 for the output million, at OpenAI rates verified 2026-10-26.