Essential AI
Rnj-1 Base
Rnj-1 Base is Essential AI's open-weight dense language model in the Rnj-1 family, focused on coding and STEM.
- Context
- 32.77K
Accepts
- Text input
Produces
- Text output
AI model comparison
Compare pricing, context limits, supported inputs and deployment options to choose a model for your workflow.
These checkpoints share a family but have different intended uses. Base is a foundation for further training; Instruct is the conversationally prepared candidate. A direct chat test with one wrapper can misrepresent the base checkpoint.
The table below shows each profile's documented interface and recorded limits. Missing prices or measurements remain unknown. Open the source links on each profile to confirm the current checkpoint or API route.
Essential AI
Rnj-1 Base is Essential AI's open-weight dense language model in the Rnj-1 family, focused on coding and STEM.
Accepts
Produces
Essential AI
Rnj-1 Instruct is Essential AI's open-weight dense language model in the Rnj-1 family, focused on coding and STEM.
Accepts
Produces
At a glance
Compare the available figures below, then try both models on the work you need to do.
Context capacity
Higher listed limit
Rnj-1 Base:32.77K
Rnj-1 Instruct:32.77K
Same value
Specifications
| Specification | Rnj-1 Base | Rnj-1 Instruct |
|---|---|---|
| Provider | Essential AI | Essential AI |
| Listed pricing route | Essential AI | Essential AI |
| Model family | Rnj-1 | Rnj-1 |
| Accepted inputs | text | text |
| Produced outputs | text | text |
| Context window | 32.77K | 32.77K |
| Reasoning mode | Not documented | Not documented |
| Tool calling | Not documented | Documented |
| Image input | Not documented | Not documented |
| Audio input | Not documented | Not documented |
| Structured output | Not documented | Not documented |
| License | Apache-2.0 | Apache-2.0 |
Workload guidance
Choose Instruct for an assistant evaluation and Base for a training experiment that includes post-training and held-out tests. For either, record the tokenizer, system prompt and runtime. Keep the standard 32K configuration separate from an optional context extension.
Inspect the first model profile and the second model profile. Keep your test inputs, runtime settings and acceptance criteria with the result so the comparison can be repeated.
Explore each model’s features, API requirements and licence terms in the sources below.
Rnj-1 Base
Essential AI
Profile updated Oct 7, 2026
Rnj-1 Instruct
Essential AI
Profile updated Oct 7, 2026
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