OpenAIGPT-5.6 Luna Pro pricing
$0.20 per 1M input tokens and $1.20 per 1M output tokens. In real work that is 0.14¢ per chat answer and 0.32¢ to summarize a 20-page PDF.
What GPT-5.6 Luna Pro costs per task
Token counts estimated from a measured model of the same lab (GPT-6 Luna), rescaled by tokenizer. Reasoning tokens are billed as output.
| Task | Cost | Tokens used | Price rank | Basis |
|---|---|---|---|---|
| Answer a chat question | 0.14¢$1.42 / 1,000 | 45 in · 540 out · 639 reasoning | 131 of 336 | estimated |
| Reply to a customer email | 0.02¢$0.16 / 1,000 | 258 in · 94 out | 40 of 336 | estimated |
| Write a 1,500-word blog post | 0.28¢$2.84 / 1,000 | 59 in · 2,217 out · 143 reasoning | 84 of 336 | estimated |
| Write 10 product descriptions | 0.13¢$1.28 / 1,000 | 283 in · 987 out · 34 reasoning | 38 of 336 | estimated |
| Translate 1,000 words | 0.19¢$1.94 / 1,000 | 1,330 in · 1,328 out · 67 reasoning | 100 of 336 | estimated |
| Proofread one page (500 words) | 0.10¢$1.05 / 1,000 | 718 in · 664 out · 91 reasoning | 96 of 336 | estimated |
| Summarize a 20-page PDF | 0.32¢$3.24 / 1,000 | 12,987 in · 449 out · 84 reasoning | 94 of 336 | estimated |
| Extract data from an invoice | 0.07¢$0.75 / 1,000 | 373 in · 422 out · 140 reasoning | 83 of 336 | estimated |
| Analyze a 200-row spreadsheet | 0.43¢$4.31 / 1,000 | 4,779 in · 456 out · 2,338 reasoning | 58 of 336 | estimated |
| Answer from 5 retrieved documents (RAG) | 0.11¢$1.14 / 1,000 | 3,690 in · 234 out · 104 reasoning | 66 of 336 | estimated |
| Classify 100 support tickets | 0.15¢$1.49 / 1,000 | 1,261 in · 445 out · 590 reasoning | 49 of 336 | estimated |
| Review 500 lines of code | 0.72¢$7.22 / 1,000 | 4,557 in · 337 out · 4,921 reasoning | 114 of 336 | estimated |
| Write a SQL query | 0.10¢$0.96 / 1,000 | 126 in · 266 out · 516 reasoning | 103 of 336 | estimated |
| Run a 50-step coding agent | 8.6¢$85.82 / 1,000 | 2,237,500 in · 15,000 out · 7,000 reasoning | 40 of 336 | modeled |
Price at every provider
List prices per 1M tokens (input / output) at each host serving GPT-5.6 Luna Pro through OpenRouter today. Hosts can differ in quantization, context and speed.
| Provider | Input / output | Cached input | Context | Uptime |
|---|---|---|---|---|
OpenAIunknown | $0.10 / $0.60 | $0.01 | 1.05M | |
 Azureunknown | $0.20 / $1.20 | $0.02 | 1.05M | 100% |
OpenAIunknown | $0.20 / $1.20 | $0.02 | 1.05M | 100% |
Azureunknown | $0.22 / $1.32 | $0.022 | 1.05M | |
OpenAIunknown | $0.40 / $2.40 | $0.04 | 1.05M |
Price history
First seen in our price history on Jul 17, 2026 at $1.00 input / $6.00 output. Since then the output price moved from $6.00 to $1.20 per 1M tokens (3 changes).
FAQ
How much does GPT-5.6 Luna Pro cost?
GPT-5.6 Luna Pro costs $0.20 per 1 million input tokens and $1.20 per 1 million output tokens, with cached input at $0.02 (list price on Oct 18, 2026). In practice one chat answer costs about 0.14¢ and summarizing a 20-page PDF about 0.32¢.
Where is GPT-5.6 Luna Pro cheapest?
Among 5 providers we track, the lowest list price today is at OpenAI: $0.10 input and $0.60 output per 1M tokens.
Does GPT-5.6 Luna Pro 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-5.6 Luna Pro cost per task measured or estimated?
Estimated: GPT-5.6 Luna Pro was not run directly. Tokens come from GPT-6 Luna and are rescaled by the tokenizer of OpenAI. Real usage can differ.