GPT-5.6 Luna API Pricing: Cost Calculator & Real Examples (2026)
GPT-5.6 Luna charges $1.00 per 1 million input tokens and $6.00 per 1 million output tokens. But per-token prices don't answer the real question: what will your workload cost per month? Below we compute it for three realistic scenarios — or run your own numbers with GPT-5.6 Luna preselected.
| Meter | Price per 1M tokens |
|---|---|
| Input | $1.00 |
| Cached input | $0.10 |
| Output | $6.00 |
Note: Launched 2026-07-09: fastest and most affordable of the 5.6 family.
What does GPT-5.6 Luna cost in practice?
| Monthly scenario | Token bill |
|---|---|
| Support chatbot (150k requests, 400 in / 300 out tokens) | $330.00 |
| Document workflow (22k runs, 3,000 in / 400 out tokens) | $118.80 |
| High-volume classifier (1M requests, 300 in / 10 out tokens) | $360.00 |
In the chatbot scenario, output is ~82% of the GPT-5.6 Luna bill — capping response length (max tokens) is the most direct optimization. Document workflows are input-heavy, so the input rate dominates there.
Prompt caching savings
GPT-5.6 Luna offers cached input at $0.10/1M (vs $1.00 standard). At a 60% cache-hit rate, the example chatbot drops from $330.00 to $297.60/month — saving $32.40. If your system prompt and context are stable, this discount is free money.
Is GPT-5.6 Luna cheap or expensive?
On the same chatbot workload, GPT-5.6 Luna is cheaper than 8 of the 13 models we track (position 6 of 14, cheapest to priciest). The nearest cheaper alternative is Claude Haiku 4.5 ($285.00/month on the same scenario). One step up: Mistral Medium (latest) ($427.50/month). The right decision isn't absolute price but the cheapest model that meets your quality bar — test before overpaying.
FAQ
How much does GPT-5.6 Luna cost per 1M tokens?
$1.00 per 1M input tokens and $6.00 per 1M output tokens (verified 2026-07-09).
What does a chatbot cost on GPT-5.6 Luna?
A 500-active-user chatbot (10 questions/day, 400 input + 300 output tokens per request) costs ~$330.00/month in tokens on GPT-5.6 Luna. Adjust the assumptions in the calculator.
Prices verified on 2026-07-09 against the provider's official pricing page. Estimates are for planning purposes only — always confirm current pricing with the provider.