GPT-5.6 Luna API pricing — cost per million tokens
OpenAI's GPT-5.6 Luna costs $1 per million input tokens and $6 per million output tokens on the standard API tier (verified 2026-07-05). Compare it in the full pricing table or price your own prompts in the token cost calculator.
GPT-5.6 Luna price per million tokens
| direction | $ / Mtok | $ / 1K tokens |
|---|---|---|
| input (prompt) | $1 | $0.001 |
| output (completion) | $6 | $0.006 |
What real requests cost on GPT-5.6 Luna
| workload | input | output | total |
|---|---|---|---|
| Chat message (1K in / 500 out) | $0.001 | $0.003 | $0.004 |
| Long document (100K in / 2K out) | $0.10 | $0.012 | $0.11 |
| Agent session (500K in / 50K out) | $0.50 | $0.30 | $0.80 |
How GPT-5.6 Luna pricing compares
On the same chat-message workload, GPT-5.6 Luna costs 14× more than DeepSeek V4 Flash (the cheapest tracked model) — capability, latency and context limits are the other side of that trade. Output tokens dominate long generations: at $6/Mtok, a 50K-token agent transcript costs $0.30 in output alone. Official rate card: OpenAI pricing.
Related: GPT-5.5 pricing · GPT-5.4 nano pricing · DeepSeek V4 Flash pricing · release timeline
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