THE TICKER · OPENAI · CHECKED DAILY · LAST CHANGE 2026-10-13
GPT-6 LUNA API PRICING
What OpenAI charges for GPT-6 Luna, in USD, cross-checked daily against the public pricing dataset. Effective price — if there's a promo running, this is the promo.
OpenAI publishes no separate marginal rate above the line — just this one number, same shape as Google's confirmed whole-request pricing. The scenarios below stay under the line; a large-codebase agent run often doesn't.
NOTE: Cheapest GPT-6 tier — 100x below Astra, and half the price of the 5.6 Luna it succeeds.
WHAT THINGS ACTUALLY COST ON GPT-6 LUNA
| Scenario | Tokens in / out | 1 run | 1,000 runs |
|---|---|---|---|
| A typical prompt (300 tokens in) | 300 / ~900 | $0.0005 | $0.48 |
| A 20-turn conversation (context re-sent) | 4,000 / ~4,000 | $0.0024 | $2.40 |
| Summarizing a 10-page document | 8,000 / ~3,200 | $0.0024 | $2.40 |
| One agent run (tools, retries, thinking) | 2,000 / ~12,000 | $0.0062 | $6.20 |
| A code review request | 1,500 / ~3,750 | $0.0020 | $2.02 |
Output sizes assume the same editorial ratios as the Burn Calculator (3x for prompts, 6x for agent runs). Estimates, not invoices.
VS. THE REST OF THE BOARD
“Same job” = a 1,000-token prompt with a 3,000-token reply, priced on both models. Cheaper is not always better. It is, however, always cheaper.
PRICE HISTORY
GPT-6 Luna joins the board at $0.10 in / $0.50 out per MTok — the cheapest model we track, 100x below GPT-6 Astra and half the price of GPT-5.6 Luna.
Source: developers.openai.com/api/docs/pricing · price last confirmed against the daily source on 2026-10-14. The full changelog lives at /pricing/changes.
NOW FIND OUT HOW MUCH OF THAT IS WASTE
GPT-6 Luna's price is fixed. Your token count isn't. Paste a real prompt into the Burn Calculator and see what it costs on GPT-6 Luna — and how much a leaner version would save at 1,000 runs. Or pull the whole board from the ticker.