GPT-5.6 Luna Pricing — Token Costs & API Calculator
Official API pricing for GPT-5.6 Luna by OpenAI, with context window, tokenizer details, and a plain-English cost estimate.
Pricing Details
| Attribute | Value |
|---|---|
| Provider | OpenAI |
| Input cost (per 1M tokens) | $1.00 |
| Output cost (per 1M tokens) | $6.00 |
| Long-context rate (prompts over 272K tokens) | $2.00 input / $9.00 output per 1M |
| Context caching | Yes — 90% off input tokens |
| Batch API discount | 50% off |
| Context window | 1.1M tokens |
| Tokenizer | o200k_base (GPT-4o / o-series) |
| Thinking / reasoning | Yes — billed as additional output tokens (est. 3× multiplier) |
Cost example
1,000 requests × 500 input tokens × 200 output tokens costs $1.70/month with GPT-5.6 Luna at OpenAI's published rates.
Based on $1/1M input tokens and $6/1M output tokens.
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