GPT model for general reasoning, writing, coding, and tool-assisted tasksGPT Luna Latest by openai is offered by 3 providers on this page. No official API price is listed for it; the prices below come from third-party channels. The lowest paid channel is OpenRouter at $0.10 / $0.50 per 1M. That channel is a third-party gateway, so confirm its availability and rate limits before depending on it.
The context window is 1,050,000 tokens, with an output limit of 128,000 tokens. It supports reasoning, tool use, and structured output. Accepted input modalities are PDF, Image, and Text. Its training knowledge cuts off at 2026-02-16.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| OpenRouter | Gateway | $0.10 tiered >272K: $0.20 | $0.50 | $0.01 | $0.13 | 1,050,000 | 128,000 | |
| NanoGPT | Gateway | $0.10 | $0.50 | $0.01 | $0.13 | 1,050,000 | 128,000 | |
| Kilo Gateway | Gateway | $0.10 | $0.50 | $0.01 | $0.13 | 1,050,000 | 128,000 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.