# GPT-5.6 Luna spotted on Artificial Analysis

GPT-5.6 Luna is a model from OpenAI, released on 9 Jul 2026. First seen 19 Sep 2026. Catalogues list a 1,050,000 tokens context window. 3 evidence links.

- Kind: Sighting
- Developer: OpenAI
- Confidence: Confirmed
- First seen: 2026-09-19T20:25:27.127Z
- Model: [GPT-5.6 Luna](https://alexgetman.com/models/openai/gpt-5-6-luna/)
- Canonical: https://alexgetman.com/signals/2026/09/19/gpt-5-6-luna/

## Evidence links

- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [models.dev · catalogue](https://models.dev/#gpt-5.6-luna)
- [OpenAI · pricing](https://developers.openai.com/api/docs/pricing)