EssentialAI: Rnj 1 Instruct✓ Catalog verified
Rnj-1 is an 8B-parameter, dense, open-weight model family developed by Essential AI and trained from scratch with a focus on programming, math, and scientific reasoning. The model demonstrates strong performance across multiple programming languages, tool-use workflows, and agentic execution environments (e.g., mini-SWE-agent).
Overview
Rnj-1 is an 8B-parameter, dense, open-weight model family developed by Essential AI and trained from scratch with a focus on programming, math, and scientific reasoning. The model demonstrates strong performance across multiple programming languages, tool-use workflows, and agentic execution environments (e.g., mini-SWE-agent).
Access: available through the official Essentialai API. Context window: 33K.
Specifications
| API identifier | essentialai/rnj-1-instruct |
| Provider | Essentialai |
| Model type | Text LLM |
| Context window | 33K catalog |
| Input modalities | text |
| Output modalities | text |
| Released | Dec 7, 2025 |
| Moderated | No |
| Architecture modality | text->text |
API defaults
{
"top_p": null,
"temperature": null,
"frequency_penalty": null
}Pricing
Live pricing components for essentialai/rnj-1-instruct as published in the catalog.
| Pricing component | Raw unit price | Normalized | Unit |
|---|---|---|---|
| Prompt tokens | $1.5e-7 | $0.15 / 1M | Per input token |
| Completion tokens | $1.5e-7 | $0.15 / 1M | Per output token |
| Request fee | N/A | N/A | Per request |
| Image fee | N/A | N/A | Per image unit |
| Web search fee | N/A | N/A | Per search request |
Cost calculator
Estimate monthly spend from your own token volumes.
Estimated Total Cost
$0.1Calculated from current list pricing in the ModelsAtlas catalog.Capabilities
| Capability | Status | What it means |
|---|---|---|
| Visual Understanding | Not advertised | Image and document analysis support |
| Audio Processing | Not advertised | Speech and voice aligned flows |
| Tool Calling | ✓ Supported | Supports tools / function calling |
| Self-Hosting | Not advertised | Deploy outside managed APIs |
Capability signals
Directional signals derived from model metadata and capability tags — not official benchmark submissions.
Quick start
Call EssentialAI: Rnj 1 Instruct through an OpenAI-compatible client.
from openai import OpenAI
client = OpenAI(
base_url="https://openrouter.ai/api/v1",
api_key="YOUR_API_KEY"
)
response = client.chat.completions.create(
model="essentialai/rnj-1-instruct",
messages=[{"role": "user", "content": "Explain quantum physics."}]
)
print(response.choices[0].message.content)Alternatives
Closest models by context window from a different provider.
| Model | Provider | Context | Input /1M | Actions |
|---|---|---|---|---|
| AionLabs: Aion-RP 1.0 (8B) | Aion Labs | 33K | $0.80 | View → |
| Arcee AI: Coder Large | Arcee Ai | 33K | $0.50 | View → |
Sources & attribution
Pricing and metadata are maintained in the ModelsAtlas catalog.
Frequently asked questions
How much does EssentialAI: Rnj 1 Instruct cost?
$0.15 per 1M input tokens and $0.15 per 1M output tokens on the official Essentialai API.
What is the context window of EssentialAI: Rnj 1 Instruct?
EssentialAI: Rnj 1 Instruct supports up to 33K tokens of context.
Does EssentialAI: Rnj 1 Instruct support tool / function calling?
Yes, EssentialAI: Rnj 1 Instruct supports tool / function calling — you can register tools and the model will emit structured tool calls.
How do I access EssentialAI: Rnj 1 Instruct?
Use the official Essentialai API with the model id `essentialai/rnj-1-instruct`. See the Quick start section above for code examples.