rnj-1-instruct

apache-2.08.3B

Rnj-1 is a family of 8B parameter open-weight, dense models trained from scratch by Essential AI, optimized for code and STEM with capabilities on par with SOTA open-weight models. These models perform well across a range of programming languages and boast strong agentic capabilities (e.g., inside agentic frameworks like mini-SWE-agent), while also excelling at tool-calling. They additionally exhibit strong capabilities in math and science.

Context
33K

Capabilities

Reasoning & Interaction
Tool Calling
Infrastructure
Streaming
Fine-tuning

Details

Model IDEssentialAI/rnj-1-instruct
Provider Hugging Face
Creator essentialai
Family—
Licenseapache-2.0
Status—
Typechat
Input modalitiestext
Output modalitiestext
Open weightYes
Parameters8.3B
Architecturetransformer
Context window33K tokens
Max input—
Max output—
Reasoning tokens—
Knowledge cutoff—
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

API

GET/v1/models/huggingface/EssentialAI/rnj-1-instruct

rnj-1-instruct

EssentialAI/rnj-1-instruct

Rnj-1 is a family of 8B parameter open-weight, dense models trained from scratch by Essential AI, optimized for code and STEM with capabilities on par with SOTA open-weight models. These models perform well across a range of programming languages and boast strong agentic capabilities (e.g., inside agentic frameworks like mini-SWE-agent), while also excelling at tool-calling. They additionally exhibit strong capabilities in math and science.

Changes · 4 entries
EssentialAI/rnj-1-instructupdate1cd659eMar 24, 2026, 04:19 AM
capabilitiesfine tuningyes
EssentialAI/rnj-1-instructupdateb301ebeMar 23, 2026, 11:47 PM
model_typechat
modalitiesinput["text"]output["text"]
EssentialAI/rnj-1-instructupdate2b100acMar 23, 2026, 05:30 AM
capabilitiestool callyes
page_urlhttps://huggingface.co/EssentialAI/rnj-1-instruct
descriptionRnj-1 is a family of 8B parameter open-weight, dense mode...
release_date2025-12-04
context_window32768
licenseapache-2.0
parameters8.3
taglinestyle="vertical-align: middle;" src="https://img.shields....
architecturetransformer
open_weightyes
tools["function_calling"]
EssentialAI/rnj-1-instructcreate7f5c66fMar 21, 2026, 05:16 AM