# nvidia/nemotron-3-ultra-550b-a55b

Calls to the model nvidia/nemotron-3-ultra-550b-a55b on Together AI stopped working on August 27, 2026.

- API: Together AI (api.together.xyz)
- Model: nvidia/nemotron-3-ultra-550b-a55b
- Kind: Model retirement
- Takes effect: August 27, 2026
- Calls after that day: fail
- Calls it hits: `model nvidia/nemotron-3-ultra-550b-a55b`
- Source: [Deprecations page](https://docs.together.ai/docs/deprecations)
- Page: https://www.okapi.bot/models/together-ai/nvidia/nemotron-3-ultra-550b-a55b/