--- title: Upstage: Solar Mini 4 API | Text Generation | ModelsLab description: Build with Upstage: Solar Mini 4 API by Upstage. Text generation, chat, code, and reasoning. Plans from $21/month. url: https://modelslab.com/models/upstage/upstage-solar-mini4.md canonical: https://modelslab.com/models/upstage/upstage-solar-mini4 type: product component: Playground/LLM/Index generated_at: 2026-09-30T08:17:01.641835Z --- Upstage: Solar Mini 4 --- [LLMs.txt](https://modelslab.com/models/upstage/upstage-solar-mini4/llms.txt) [.md](https://modelslab.com/models/upstage/upstage-solar-mini4.md) Upstage: Solar Mini 4 --- 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 text files Send ### Upstage: Solar Mini 4 upstage upstage-solar-mini4 Copy model ID PricingInput $0.05 / 1M tokens Output $0.20 / 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. Temperature0.7 Max Tokens4000 Top P0.9 Frequency Penalty0 Presence Penalty0 Thinkinglow lowmediumhigh Deeper thinking spends more of the Max Tokens budget before the answer starts. Model Info Support Looking for something different? --- Models that trade off differently against the one you are viewing ### Better quality Newer flagship models that generally produce stronger results. [OpenAI](https://modelslab.com/models/openai) [GPT 5.2](https://modelslab.com/models/openai/gpt-5.2) [OpenAI](https://modelslab.com/models/openai) [GPT 5.1](https://modelslab.com/models/openai/gpt5.1) [Google](https://modelslab.com/models/google) [Gemini 3 Pro Preview](https://modelslab.com/models/google/gemini-3-pro-preview) [OpenAI](https://modelslab.com/models/openai) [GPT-5.1-Codex-Max](https://modelslab.com/models/openai/gpt-5.1-codex-max) ### Lower cost per run Open-source models we host, unlimited on the $149/month plan. 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It is built for agentic use cases where response... ### Technical Specifications Model IDupstage-solar-mini4 CategoryLLM Models TaskText Generation Price$0.125 per million tokens AddedSeptember 23, 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 Upstage: Solar Mini 4 into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/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": "upstage-solar-mini4", "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}") ``` ### Pricing Upstage: Solar Mini 4 API costs $0.125 per million tokens. Plans start at $21/month, and open-source models are unlimited on the $149/month plan. [View pricing plans](https://modelslab.com/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.com/models?feature=llmaster) [More from Upstage](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing) Upstage: Solar Mini 4 FAQ --- ### What is Upstage: Solar Mini 4? Solar Mini 4 is Upstage's compact, cost-efficient language model, a 35B-parameter mixture-of-experts with 3B active parameters and a 524K context window. It is built for agentic use cases where response... ### How do I use the Upstage: Solar Mini 4 API? You can integrate Upstage: Solar Mini 4 into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "upstage-solar-mini4" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Upstage: Solar Mini 4 cost? Upstage: Solar Mini 4 costs $0.125 per million tokens. ModelsLab plans start at $21/month (Basic), and the $149/month Open Source plan includes unlimited generation on open-source models. ### What is the Upstage: Solar Mini 4 model ID? The model ID for Upstage: Solar Mini 4 is "upstage-solar-mini4". Use this ID in your API requests to specify this model. ### Do I need a paid plan to use Upstage: Solar Mini 4? Yes. ModelsLab is subscription-based with no free tier — plans start at $21/month (Basic, 3,250 API calls). The $149/month Open Source Unlimited plan includes unlimited generation across open-source models; premium third-party models are billed per call from your wallet. --- *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 - 2026-09-30*