# GPT-6 Luna

GPT-6 Luna is an OpenAI language model released Sep 22, 2026; OpenAI's newest language model in our dataset is GPT-6.1 Terra. Proprietary, API access only. OpenAI's low-cost GPT-6 model, the model behind ChatGPT Free and Go according to OpenAI. Verified against vendor sources on Oct 26, 2026.

Last verified: 2026-10-26 · Evidence: Reported · Canonical: https://theagenticweekly.com/models/gpt-6-luna · JSON: https://theagenticweekly.com/api/models/gpt-6-luna

## Key facts

| Fact | Value | Source |
|---|---|---|
| Vendor | OpenAI |  |
| Released | Sep 22, 2026 | https://developers.openai.com/api/docs/changelog |
| API id | `gpt-6-luna` | https://developers.openai.com/api/docs/models/gpt-6-luna |
| Context window | 1,050,000 tokens (1.05M) | https://developers.openai.com/api/docs/models/gpt-6-luna |
| Max output | 128,000 tokens | https://developers.openai.com/api/docs/models/gpt-6-luna |
| Input | text, image | https://developers.openai.com/api/docs/models/gpt-6-luna |
| Output | text | https://developers.openai.com/api/docs/models/gpt-6-luna |
| Licence | Proprietary (API) | https://developers.openai.com/api/docs/models/gpt-6-luna |
| Pricing | $0.1 in / $0.5 out per 1M tokens | https://developers.openai.com/api/docs/models/gpt-6-luna |

## Notes

- Knowledge cutoff listed: May 18, 2026.

## What we tested

Nothing yet. We have not run GPT-6 Luna ourselves, so every fact here is Reported from the sources below.

## Sources

- [OpenAI model page](https://developers.openai.com/api/docs/models/gpt-6-luna)
- [OpenAI API changelog](https://developers.openai.com/api/docs/changelog)

Data licence: CC BY 4.0. Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0.