--- title: EssentialAI: Rnj 1 Instruct | Text Generation | ModelsLab description: 8B open-weight LLM excelling in agentic coding (20.8% SWE-bench), STEM tasks, tool use; 32K context, 8.3B params, rivals 10x larger models.[1][2][5] url: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/together_ai/essentialai-rnj-1-instruct.md canonical: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/together_ai/essentialai-rnj-1-instruct.md type: product component: Playground/LLM/Index generated_at: 2026-05-13T08:41:24.014790Z --- EssentialAI: Rnj 1 Instruct --- [LLMs.txt](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/essentialai-rnj-1-instruct/llms.txt) [.md](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/essentialai/essentialai-rnj-1-instruct.md) essentialai-rnj-1-instruct essentialai Closed Source Model $0.150000 / call EssentialAI: Rnj 1 Instruct --- Choose a prompt below to get started or type your own message Explain quantum computing in simple terms Write a Python function to sort a list Create a marketing email for a SaaS product Compare REST vs GraphQL APIs Send ### EssentialAI: Rnj 1 Instruct essentialai essentialai-rnj-1-instruct Copy model ID PricingInput $0.15 / 1M tokens Output $0.15 / 1M tokens API EndpointsOpenAI Compatible `https://modelslab.com/api/v7/llm/chat/completions`Endpoint Anthropic Compatible `https://modelslab.com/api/v7/llm/v1/messages`Messages `https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens `https://modelslab.com/api/v7/llm/v1/models`Models Use with Claude Code cURL Example ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses. 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Model](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/together_ai/moonshotai-Kimi-K2.5) About EssentialAI: Rnj 1 Instruct --- 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... ### Technical Specifications Model IDessentialai-rnj-1-instructCategoryLLM ModelsTaskText GenerationPrice$0.150000 per million tokensAddedFebruary 20, 2026 ### Key Features - Chat completion and multi-turn conversation API - Streaming response with token-by-token output - Function calling and tool use support - System prompts and role-based messaging - JSON mode and structured output ### Quick Start Integrate EssentialAI: Rnj 1 Instruct into your application with a single API call. Get your API key from the [pricing page](https://modelslab-frontend-v2-927501783998.us-east4.run.app/pricing) to get started. PythonJavaScriptcURLPHP ``` import requests import json url = "https://modelslab.com/api/v7/llm/chat/completions" headers = { "Content-Type": "application/json" } data = { "model_id": "essentialai-rnj-1-instruct", "messages": [ { "role": "user", "content": "Hello!" } ], "max_tokens": 1000, "key": "YOUR_API_KEY" } try: response = requests.post(url, headers=headers, json=data) response.raise_for_status() # Raises an HTTPError for bad responses (4XX or 5XX) result = response.json() print("API Response:") print(json.dumps(result, indent=2)) except requests.exceptions.HTTPError as http_err: print(f"HTTP error occurred: {http_err} - {response.text}") except Exception as err: print(f"Other error occurred: {err}") ``` View the [full API documentation](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/essentialai/essentialai-rnj-1-instruct/api) for SDKs, code examples in Python, JavaScript, and more. ### Pricing EssentialAI: Rnj 1 Instruct API costs $0.150000 per million tokens. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab-frontend-v2-927501783998.us-east4.run.app/pricing) ### Use Cases - AI chatbots and virtual assistants - Code generation and developer tools - Content writing and copywriting automation - Data analysis, summarization, and extraction [Browse LLM Models](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models?feature=llmaster) [More from Essentialai](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [View Pricing](https://modelslab-frontend-v2-927501783998.us-east4.run.app/pricing) EssentialAI: Rnj 1 Instruct FAQ --- ### What is EssentialAI: Rnj 1 Instruct? 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... ### How do I use the EssentialAI: Rnj 1 Instruct API? You can integrate EssentialAI: Rnj 1 Instruct into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "essentialai-rnj-1-instruct" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does EssentialAI: Rnj 1 Instruct cost? EssentialAI: Rnj 1 Instruct costs $0.150000 per million tokens. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started. ### What is the EssentialAI: Rnj 1 Instruct model ID? The model ID for EssentialAI: Rnj 1 Instruct is "essentialai-rnj-1-instruct". Use this ID in your API requests to specify this model. ### Does EssentialAI: Rnj 1 Instruct have a free tier? Yes, ModelsLab offers a free tier that lets you try EssentialAI: Rnj 1 Instruct and other AI models. Sign up to get free API credits and start building immediately. --- *This markdown version is optimized for AI agents and LLMs.* **Links:** - [Website](https://modelslab.com) - [API Documentation](https://docs.modelslab.com) - [Blog](https://modelslab.com/blog) --- *Generated by ModelsLab - 2026-05-13*