GPT-5.6 Luna API price, and what each result really costs
OpenAI, listed 9 Jul 2026. Price checked 12 Nov 2026; unchanged since we started tracking it. Source: OpenAI's pricing page. openai/gpt-5.6-luna
List price per million tokens
- Input
- $0.20
- Cached input
- $0.02
- Output
- $1.20
- Context window
- 1.05M tokens
Note: Long context (>272K input tokens): $0.40 in / $0.04 cached / $1.80 out.
What it costs per task, and per task that works
Six common task shapes with typical token counts. The real cost counts the tries that get redone; the rates are examples, not measurements.
| Task | Per 1,000 tries | Per 1,000 that work, 8 in 10 | Per 1,000 that work, 6 in 10 | Per 1,000 that work, 4 in 10 |
|---|---|---|---|---|
| Support bot answer3,000 in / 300 out | $0.96 | $1.20 | $1.60 | $2.40 |
| Invoice field extraction2,500 in / 250 out | $0.80 | $1.00 | $1.33 | $2.00 |
| Lead scoring1,200 in / 100 out | $0.36 | $0.45 | $0.60 | $0.90 |
| Email reply draft1,500 in / 400 out | $0.78 | $0.97 | $1.30 | $1.95 |
| Translation900 in / 800 out | $1.14 | $1.42 | $1.90 | $2.85 |
| Search re-ranking4,000 in / 50 out | $0.86 | $1.08 | $1.43 | $2.15 |
Work out your own real cost per resultTest GPT-5.6 Luna on your own prompt
Compare GPT-5.6 Luna with
- GPT-4o mini$0.15 in / $0.60 outSwitch cost
- gpt-oss-120b$0.15 in / $0.60 outSwitch cost
- Llama 4 Maverick$0.35 in / $1.00 outSwitch cost
- DeepSeek V4.1 Flash$0.30 in / $1.20 outSwitch cost
- MiniMax M3$0.30 in / $1.20 outSwitch cost
Worked-through switches: GPT-5 nano → GPT-5.6 Luna: cost and quality on real tasks
Questions
How much does the GPT-5.6 Luna API cost?
$0.20 per million input tokens and $1.20 per million output tokens, or $0.02 per million for cached input. Price checked 12 Nov 2026; unchanged since we started tracking it.
What does a result that works really cost with GPT-5.6 Luna?
A support bot answer (about 3,000 tokens in, 300 out) costs $0.00096 per try. If 6 in 10 work first time, each answer that works really costs $0.0016, because the redone ones were paid for too.