OpenAIGPT-5.6 Luna 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 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 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 | 100% |
 Azureunknown | $0.20 / $1.20 | $0.02 | 1.05M | 97% |
OpenAIunknown | $0.20 / $1.20 | $0.02 | 1.05M | 100% |
Azureunknown | $0.22 / $1.32 | $0.022 | 1.05M | |
 Amazon Bedrockunknown | $0.22 / $1.32 | $0.022 | 1.05M | 100% |
Azureunknown | $0.22 / $1.32 | $0.022 | 1.05M | 100% |
OpenAIunknown | $0.40 / $2.40 | $0.04 | 1.05M | 100% |
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 cost?
GPT-5.6 Luna 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 cheapest?
Among 7 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 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 cost per task measured or estimated?
Estimated: GPT-5.6 Luna was not run directly. Tokens come from GPT-6 Luna and are rescaled by the tokenizer of OpenAI. Real usage can differ.