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EssentialAI: Rnj 1 Instruct

Tool Calling Open Weights

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).

Providers 1
Released Dec 5, 2025
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Tarsk Use coding

Available Providers (1)

Provider Model ID Input Cost Output Cost Context Max Output Docs
Kilo Gateway essentialai/rnj-1-instruct $0.15/MTok $0.15/MTok 32.8K 6.6K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output