gpt-5.6-luna pricing
gpt-5.6-luna from OpenAI costs $0.200 per 1M input tokens and $1.20 per 1M output tokens. Cached input is $0.020 per 1M. Context window 1,050,000 tokens.
API id gpt-5.6-luna · OpenAI · source · updated 2026-08-11
$0.200
Input / 1M tokens
$1.20
Output / 1M tokens
$0.020
Cached input / 1M
1.1M
Context window
Long-context pricing
Prompts over 128K tokens are billed at $0.400 per 1M input and $1.80 per 1M output — roughly 2.0× the standard input rate. Budget for this if you send large documents.
What gpt-5.6-luna costs in practice
| Workload | Input tokens | Output tokens | Estimated cost |
|---|---|---|---|
| Short chat turn | 1,000 | 500 | $0.0008 |
| Document summary | 50,000 | 2,000 | $0.01 |
| 1M tokens in, 200K out | 1,000,000 | 200,000 | $0.44 |
Estimates use the standard tier and ignore caching discounts, so real bills with repeated prompt prefixes are typically lower.
Common questions
- How much does gpt-5.6-luna cost per 1M tokens?
- gpt-5.6-luna costs $0.200 per 1M input tokens and $1.20 per 1M output tokens on the standard tier. Cached input is $0.020 per 1M.
- What is gpt-5.6-luna's context window?
- gpt-5.6-luna accepts up to 1,050,000 tokens in a single request, and can return up to 128,000 output tokens.
- Is there a cheaper OpenAI model than gpt-5.6-luna?
- Yes. omni-moderation-latest is free per 1M input tokens versus $0.200 for gpt-5.6-luna.
- Where does this gpt-5.6-luna price come from?
- Directly from OpenAI's published pricing page, re-read every day and normalized to USD per 1,000,000 tokens.