Plain-English Summary
An NVIDIA-tuned Llama model for advanced reasoning and enterprise agent workflows.
Llama-3.1-Nemotron-Ultra-253B-v1
An NVIDIA-tuned Llama model for advanced reasoning and enterprise agent workflows.
Nemotron
Reasoning LLM
Open weights
Open weights: Yes
API: NVIDIA NIM and self-hosted
Technical Notes
253B-parameter reasoning model derived from Llama 3.1, optimized for instruction following and agentic tasks.
Best For
Reasoning, enterprise agents, synthetic data, self-hosted research
Watch Out For
Large hardware requirement and older than Nemotron 3 Ultra.
Model Specs
- Maker
- NVIDIA
- Country
- USA
- Family
- Nemotron
- Type
- Reasoning LLM
- Release date
- 2025-04-08
- Date confidence
- Exact
- Status
- Open weights
- Context window
- 131,072 tokens
- Max output
- Not listed
- Parameters
- 253B
- Active parameters
- 253B
- Architecture
- Dense Llama-derived transformer
- Reasoning
- Yes
- Tool calling
- Yes / host dependent
- Structured output
- Host dependent
- API available
- NVIDIA NIM and self-hosted
- Open weights
- Yes
- Self-hostable
- Yes
- License
- NVIDIA Open Model License / Llama terms
- Inputs
- Text
- Outputs
- Text
- Approx. price
- See provider pricing
- How to access
- Provider website
- Model / API ID
- Llama-3.1-Nemotron-Ultra-253B-v1
- Knowledge cutoff
- Not publicly disclosed
- Fine-tuning
- Fine-tuning, NIM, self-hosting
- Completeness
- 95 %
- Verified
- Jul 18, 2026
- Snapshot date
- Jul 18, 2026
- Source
- Official source