# gpt-5.5-high

Muse Spark 1.1 from Meta was first recorded on 13 Sep 2026. Its release date is not established. Catalogues list a 1,048,576 tokens context window. 7 evidence links.

- Kind: Sighting
- Developer: Meta
- Confidence: Observed
- First seen: 2026-09-13T22:35:52.903Z
- Model: [Muse Spark 1.1](https://alexgetman.com/models/meta/muse-spark-1-1/)
- Canonical: https://alexgetman.com/signals/2026/09/13/gpt-5-5-high-8/

## Evidence links

- [Arena · leaderboards](https://ai.meta.com/blog/introducing-muse-spark-meta-model-api/)
- [VoxelBench · leaderboard](https://voxelbench.ai/leaderboard)
- [models.dev · catalogue](https://models.dev/#muse-spark-1.1)
- [OpenCode · discovery](https://opencode.ai/data/meta/muse-spark-1-1)
- [OpenRouter](https://openrouter.ai/meta/muse-spark-1.1)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [models.dev · catalogue](https://models.dev/#muse-spark-1-1)