OpenAIGPT-6 Luna pricing
$0.10 per 1M input tokens and $0.50 per 1M output tokens. In real work that is 0.06¢ per chat answer and 0.16¢ to summarize a 20-page PDF.
Official price at OpenAI: $0.10 / $0.50 per 1M, cached $0.01 (source, verified Oct 18, 2026).
What GPT-6 Luna costs per task
Every row below was measured: we ran the task on this model and counted the tokens. Reasoning tokens are billed as output.
| Task | Cost | Tokens used | Price rank | Basis |
|---|---|---|---|---|
| Answer a chat question | 0.06¢$0.59 / 1,000 | 45 in · 540 out · 639 reasoning | 67 of 336 | measured |
| Reply to a customer email | <0.01¢$0.07 / 1,000 | 258 in · 94 out | 12 of 336 | measured |
| Write a 1,500-word blog post | 0.12¢$1.19 / 1,000 | 59 in · 2,217 out · 143 reasoning | 26 of 336 | measured |
| Write 10 product descriptions | 0.05¢$0.54 / 1,000 | 283 in · 987 out · 34 reasoning | 17 of 336 | measured |
| Translate 1,000 words | 0.08¢$0.83 / 1,000 | 1,330 in · 1,328 out · 67 reasoning | 56 of 336 | measured |
| Proofread one page (500 words) | 0.04¢$0.45 / 1,000 | 718 in · 664 out · 91 reasoning | 43 of 336 | measured |
| Summarize a 20-page PDF | 0.16¢$1.57 / 1,000 | 12,987 in · 449 out · 84 reasoning | 47 of 336 | measured |
| Extract data from an invoice | 0.03¢$0.32 / 1,000 | 373 in · 422 out · 140 reasoning | 25 of 336 | measured |
| Analyze a 200-row spreadsheet | 0.19¢$1.87 / 1,000 | 4,779 in · 456 out · 2,338 reasoning | 14 of 336 | measured |
| Answer from 5 retrieved documents (RAG) | 0.05¢$0.54 / 1,000 | 3,690 in · 234 out · 104 reasoning | 18 of 336 | measured |
| Classify 100 support tickets | 0.06¢$0.64 / 1,000 | 1,261 in · 445 out · 590 reasoning | 13 of 336 | measured |
| Review 500 lines of code | 0.31¢$3.08 / 1,000 | 4,557 in · 337 out · 4,921 reasoning | 37 of 336 | measured |
| Write a SQL query | 0.04¢$0.40 / 1,000 | 126 in · 266 out · 516 reasoning | 34 of 336 | measured |
| Run a 50-step coding agent | 4.1¢$40.71 / 1,000 | 2,237,500 in · 15,000 out · 7,000 reasoning | 12 of 336 | modeled |
Price at every provider
List prices per 1M tokens (input / output) at each host serving GPT-6 Luna through OpenRouter today. Hosts can differ in quantization, context and speed.
| Provider | Input / output | Cached input | Context | Uptime |
|---|---|---|---|---|
OpenAIunknown | $0.05 / $0.25 | $0.005 | 1.05M | 100% |
OpenAIunknown | $0.10 / $0.50 | $0.01 | 1.05M | 100% |
 Azureunknown | $0.10 / $0.50 | $0.01 | 1.05M | 100% |
Azureunknown | $0.11 / $0.55 | $0.011 | 1.05M | 100% |
Azureunknown | $0.11 / $0.55 | $0.011 | 1.05M | 100% |
 Amazon Bedrockunknown | $0.11 / $0.55 | $0.011 | 1.05M | 100% |
OpenAIunknown | $0.20 / $1.00 | $0.02 | 1.05M | 100% |
Price history
First seen in our price history on Sep 29, 2026 at $0.10 input / $0.50 output. The list price has not changed since.
FAQ
How much does GPT-6 Luna cost?
GPT-6 Luna costs $0.10 per 1 million input tokens and $0.50 per 1 million output tokens, with cached input at $0.01 (list price on Oct 18, 2026). In practice one chat answer costs about 0.06¢ and summarizing a 20-page PDF about 0.16¢.
Where is GPT-6 Luna cheapest?
Among 7 providers we track, the lowest list price today is at OpenAI: $0.05 input and $0.25 output per 1M tokens.
Does GPT-6 Luna charge for reasoning tokens?
Yes. Reasoning (thinking) tokens are billed as output tokens. That is why the cost per task can be much higher than the visible answer suggests - our task costs include them.
Is the GPT-6 Luna cost per task measured or estimated?
Measured: we ran all 13 benchmark prompts on GPT-6 Luna through OpenRouter and recorded the tokens it used.