GPT-5.6 Luna Pro API Pricing
OpenAI · context window 1.1M · prices updated 2026-08-02
What real workloads cost on GPT-5.6 Luna Pro
| Workload | Per request | Per month |
|---|---|---|
| 1K short requests/day (500 in / 150 out) | $0.0001 | $4.20 |
| Support chatbot, 500 convs/day (~5K in / 1.4K out per conv) | $0.0013 | $20.10 |
| Document pipeline, 10K docs/day (3K in / 500 out) | $0.0006 | $180 |
Model your exact traffic in the API cost calculator — it preloads GPT-5.6 Luna Pro with caching and batch options.
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Frequently asked questions
› How much does the GPT-5.6 Luna Pro API cost?
GPT-5.6 Luna Pro costs $0.1 per million input tokens and $0.6 per million output tokens, with cached input at $0.01 per million (90% cheaper). In practice, a typical short request (500 tokens in, 150 out) costs about $0.0001.
› What does 1,000 requests per day cost on GPT-5.6 Luna Pro?
At 500 input + 150 output tokens per request, 1,000 requests/day costs about $4.20 per month. Heavier workloads scale linearly — use our API cost calculator to model your exact traffic.
› How can I reduce GPT-5.6 Luna Pro costs?
Three levers, in order of impact: (1) route routine requests to a cheaper tier and keep GPT-5.6 Luna Pro for hard cases; (2) enable prompt caching — cached input is 90% cheaper, which typically halves chatbot bills; (3) use the batch API for non-urgent jobs at a ~50% discount.
› Is GPT-5.6 Luna Pro worth the price?
It depends on task difficulty. Flagship models earn their premium on complex reasoning, coding, and high-stakes output; mini/flash tiers handle classification, extraction and routine chat at 10–30× lower cost. Benchmark a sample of your real workload on both before committing.