GPT-6 Luna pricing: API and ChatGPT plans
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output, with a 1.05M context window. In ChatGPT, it comes with the free plan, and the cheapest paid plan with it is Go at $8/mo.
US dollars per million tokens, standard rate, shortest context band. Plan prices read 14 October 2026.
- 1,000 support replies
- $0.50
- Cached input
- $0.01
- Context window
- 1,050,000 tokens
- Released
- 22 Sep 2026
- Weights
- Closed weights
From OpenAI’s own pages, 15 October 2026.
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens on OpenAI’s own API, and $0.01 for cached input. At those prices 1,000 support replies cost $0.50, the cheapest of 42 priced models on our list.
In ChatGPT: GPT-6 Luna is included in Free ($0/mo), Go ($8/mo), Plus ($20/mo), Pro (from $100/mo), Business ($25/mo).
chatgpt.com/pricing/ · Read 14 October 2026. Prices can differ by country and include or exclude tax depending on the country.
What a job costs
Three jobs, 1,000 runs of each, at the list price above, and where each puts GPT-6 Luna among the 42 models with a list price.
| Job | 1,000 runs | Among 42 |
|---|---|---|
| Support reply3,000 in, 400 out. | $0.50 | cheapest |
| Document summary25,000 in, 1,000 out. | $3.00 | cheapest |
| Agent task80,000 in (70,000 cached), 3,000 out. | $3.20 | cheapest |
The token counts are ours, chosen to look like real work; the prices are OpenAI’s. All three jobs stay under 100,000 tokens a request, below every long-context surcharge on the list.
The small print
What the base rate above leaves out, copied from the maker’s pages: surcharges, discounts, promotions and cache pricing.
Requests above 272K input tokens bill 2x input and 1.5x output ($0.20 / $0.75, cached $0.02). Cache write $0.125. Batch and Flex 50% off, Fast mode 2x. Data residency adds 10%.
GPT-6 Luna against the models it is weighed with
Each comparison puts both list prices side by side and costs the same three jobs on each.
- vs Claude Haiku 5.5
- The newest small models from Anthropic and OpenAI, at the same $0.10 / $0.50 list price.
- vs GPT-5.6 Luna
- OpenAI's new Luna at half the input price of the GPT-5.6 Luna it follows.
- vs Gemini 3.5 Flash-Lite
- OpenAI's and Google's newest budget models for high-volume tasks, with Luna cheaper on input and output.
Other OpenAI models
| Model | Input | Output | Context | 1,000 replies |
|---|---|---|---|---|
| GPT-5.6 LunaOpenAINewer model: GPT-6 Luna | $0.20 | $1.20 | 1.05M | $1.08 |
| GPT-5.4 nanoOpenAINewer model: GPT-6 Luna | $0.20 | $1.25 | 400K | $1.10 |
| GPT-5.4 miniOpenAI | $0.75 | $4.50 | 400K | $4.05 |
| GPT-6.1 SolOpenAI | $2.00 | $10.00 | 1.05M | $10.00 |
| GPT-6 SolOpenAINewer model: GPT-6.1 Sol | $2.00 | $10.00 | 1.05M | $10.00 |
| GPT-5.6 TerraOpenAINewer model: GPT-6.1 Sol | $2.00 | $12.00 | 1.05M | $10.80 |
| GPT-5.6 SolOpenAINewer model: GPT-6.1 Sol | $4.00 | $20.00 | 1.05M | $20.00 |
| GPT-5.5OpenAINewer model: GPT-6 Astra | $5.00 | $30.00 | 1.05M | $27.00 |
| GPT-6 AstraOpenAI | $10.00 | $50.00 | 1.05M | $50.00 |
Where the price comes from
Read on 15 October 2026. Each price is the standard rate for the shortest context band, with no batch or priority discount; long-context surcharges, batch rates and promotions are in each model’s small print. No price was taken from a reseller.
Compare GPT-6 Luna with 45 other models
The price list sets every model’s input and output price side by side, with what a support reply, a document summary and an agent task cost on each.
Prices checked 15 October 2026 · See them by release date