GPT-5.6 Luna
GPT-5.6 Luna targets repeated tasks with low token costs. Its position corresponds to the nano tier of earlier GPT-5 families, while retaining a large context window.
A rate-limit table does not grant access
The model page explicitly warns that a listed usage-tier limit does not establish account access. Check the organization model list before integration. Its reasoning settings include none through max; the total window is 1,050,000 tokens.GPT-5.6 Luna official model documentation
Start with a defined decision and an uncertain result
Practical guidance. For record classification, specify permitted categories and the evidence required for each. Include a result for cases that need review. Measure important missed cases separately from average accuracy before sending the model a large queue.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Access | API |
| Model identifiers | gpt-5.6-luna |
| Context window | 1,050,000 tokens Published model context; input and output share this budget GPT-5.6 Luna official model documentation |
| Maximum output | 128,000 tokens Published maximum output; bounded by the remaining context GPT-5.6 Luna official model documentation |
| Input price | 0.2 USD per million tokens Standard text processing; inputs up to 272,000 tokens GPT-5.6 Luna official model documentation |
| Output price | 1.2 USD per million tokens Standard text processing; inputs up to 272,000 tokens GPT-5.6 Luna official model documentation |
| Input and output | text, image in; text outGPT-5.6 Luna official model documentation |
| Maximum input | 922,000 tokensGPT-5.6 Luna official model documentation |
| API routes | Chat Completions (v1/chat/completions); Responses (v1/responses); Batch (v1/batch)GPT-5.6 Luna official model documentation |
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