AI Model Atlas / OpenAI
GPT-6 Luna Pro (batch)
One million input tokens cost $0.050 and one million output tokens $0.25. Context window: 1.1M tokens, about 1,750 A4 pages.
What it costs in practice
Pricing per million tokens doesn't mean anything to anyone, so I convert it to three tasks that people actually give to models. The usage assumptions are listed for each row so you can verify them.
| Task | Input | Output | Cost |
|---|---|---|---|
| 1500-word articlebrief plus finished text in English | 1,500 tokens | 2,200 tokens | $0.0006 |
| 100 chat queries700 tokens per question and 400 per answer | 70,000 tokens | 40,000 tokens | $0.01 |
| Hour of work with an agentagent reads repository and writes fixes | 250,000 tokens | 30,000 tokens | $0.02 |
Technical details
| Provider | OpenAI |
| Modalities | files + image + text → text |
| Context window | 1.1M tokens (~1,750 A4 pages) |
| Maximum response | 128k tokens |
| Step-by-step reasoning | yes |
| Tool calling | yes |
| Forced JSON format | yes |
| Knowledge cutoff | not specified |
| Cache read | $0.005 per million |
| Content moderation | yes, provider filters |
How it compares to the rest
The database contains 469 models. In terms of input pricing GPT-6 Luna Pro (batch) is more expensive than 7 percent of paid models. A longer context window is available in 7 models.
Input price history
2026-09-23 · $0.0502026-11-11 · $0.050
The chart shows the price of a million input tokens on consecutive measurement days. History starts on the day I launched the atlas and grows with each day. I don't backfill data.
Alternatives at a similar price
Models from other providers whose cost for the same article comes out closest.
| Model | Input / M | Output / M | 1500-word article | Context |
|---|---|---|---|---|
| Claude Haiku 5.5 (batch)Anthropic | $0.050 | $0.25 | $0.0006 | 1M |
| Nemotron 3 Nano 30B A3BNVIDIA | $0.060 | $0.24 | $0.0006 | 262k |
| Nova Lite 1.0Amazon | $0.060 | $0.24 | $0.0006 | 300k |
| Qwen3 14BQwen (Alibaba) | $0.10 | $0.22 | $0.0006 | 41k |
Compare GPT-6 Luna Pro (batch) with another model or go back to the full database 469 models.