--- title: Upstage: Solar Pro 4 API | Text Generation | ModelsLab description: Build with Upstage: Solar Pro 4 API by Upstage. Text generation, chat, code, and reasoning. Plans from $21/month. url: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/upstage/upstage-solar-pro4.md canonical: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/upstage/upstage-solar-pro4 type: product component: Playground/LLM/Index generated_at: 2026-08-26T02:22:42.407552Z --- Upstage: Solar Pro 4 --- [LLMs.txt](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/upstage/upstage-solar-pro4/llms.txt) [.md](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/upstage/upstage-solar-pro4.md) Upstage: Solar Pro 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 Send ### Upstage: Solar Pro 4 upstage upstage-solar-pro4 Copy model ID PricingInput $0.03 / 1M tokens Output $0.12 / 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 Tokens1000 Top P0.9 Frequency Penalty0 Presence Penalty0 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. [![GPT 5.2](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/2bdd00f4-1692-49d8-a562-72cb1753d0ff.png)](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt-5.2)[OpenAI](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai) [GPT 5.2](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt-5.2) [![Gemini 3 Pro Preview](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/1846e76f-9d5c-4a35-a43a-82db45b7bb8b.png)](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/google/gemini-3-pro-preview)[Google](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/google) [Gemini 3 Pro Preview](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/google/gemini-3-pro-preview) [![GPT 5.1](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/fad83520-47a8-4059-b4b9-b32adf4d0be7.png)](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt5.1)[OpenAI](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai) [GPT 5.1](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt5.1) [![GPT-5.1-Codex-Max](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/06356c4c-df09-4ccb-a5c0-629da670f75b.png)](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt-5.1-codex-max)[OpenAI](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai) [GPT-5.1-Codex-Max](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt-5.1-codex-max) ### Lower cost per run Open-source models we host, unlimited on the $149/month plan. [Modelslab: Custom LLM Popular](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/modelslab/uncensored-chat)[ModelsLab](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/modelslab) [Modelslab: Custom LLM Open Source Model](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/modelslab/uncensored-chat) [Qwen3 14B](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/Qwen/Qwen-Qwen3-14B)[Qwen](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [Qwen3 14B Closed Source Model](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/Qwen/Qwen-Qwen3-14B) [![Gemma 3 4b it](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/c419acdb-893e-4bda-ac4d-cec941648345.png)](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/google/google-gemma-3-4b-it)[Google](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [Gemma 3 4b it Closed Source Model](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/google/google-gemma-3-4b-it) [![Mistral: Mistral Nemo](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/992e2422-3d81-44d7-aaa4-25dbde8f4a73.png)](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/mistralai/mistralai-mistral-nemo)[Mistral AI](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [Mistral: Mistral Nemo Closed Source Model](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/mistralai/mistralai-mistral-nemo) [Qwen3.5 35B A3b](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/Qwen/Qwen-Qwen3.5-35B-A3B)[Qwen](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [Qwen3.5 35B A3b Closed Source Model](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/Qwen/Qwen-Qwen3.5-35B-A3B) [Mistral: Mistral Small 3](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/mistralai/mistralai-mistral-small-24b-instruct-2501)[Mistral AI](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [Mistral: Mistral Small 3 Closed Source Model](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/mistralai/mistralai-mistral-small-24b-instruct-2501) Related Models --- Discover similar models you might be interested in [View all LLM Models](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models?feature=llmaster) [#### Thinking Machines/Thinking Machines: Inkling thinkingmachines-inkling From $2.50/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/thinkingmachines/thinkingmachines-inkling) [#### Google/Gemma 3N E4B Instruct google-gemma-3n-E4B-it From $0.09/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/google/google-gemma-3n-E4B-it) [#### Google/Google: Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) google-gemini-3.1-flash-lite-image From $0.88/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/google/google-gemini-3.1-flash-lite-image) [#### Qwen/Qwen: Qwen-Plus qwen-qwen-plus From $0.52/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/qwen/qwen-qwen-plus) [#### Meta/Meta: Llama 3.2 1B Instruct meta-llama-llama-3.2-1b-instruct From $0.11/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/meta/meta-llama-llama-3.2-1b-instruct) [#### Qwen/Qwen3-VL-8B-Instruct Qwen-Qwen3-VL-8B-Instruct From $0.43/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/Qwen/Qwen-Qwen3-VL-8B-Instruct) [#### Moonshot AI/MoonshotAI: Kimi K2.7 Code (batch) moonshotai-kimi-k2.7-code-batch From $2.48/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/moonshotai/moonshotai-kimi-k2.7-code-batch) [#### Qwen/Qwen: Qwen3 Max Thinking qwen-qwen3-max-thinking From $2.34/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/qwen/qwen-qwen3-max-thinking) [#### Qwen/Qwen: Qwen3.8 2.4T A95B qwen-qwen3.8-2.4t-a95b From $4.00/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/qwen/qwen-qwen3.8-2.4t-a95b) [#### Qwen/Qwen: Qwen3.8 27B qwen-qwen3.8-27b From $1.49/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/qwen/qwen-qwen3.8-27b) [#### Mistral AI/Mistral Large mistralai-mistral-large From $4.00/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/mistralai/mistralai-mistral-large) [#### Kwaipilot/Kwaipilot: KAT-Coder-Pro V2 kwaipilot-kat-coder-pro-v2 From $0.75/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/kwaipilot/kwaipilot-kat-coder-pro-v2) [#### Mistral AI/Mistral: Ministral 3 8B 2512 mistralai-ministral-8b-2512 From $0.15/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/mistralai/mistralai-ministral-8b-2512) [#### DeepSeek/DeepSeek R1 Distill Qwen 1.5B deepseek-ai-DeepSeek-R1-Distill-Qwen-1.5B From $0.18/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/deepseek/deepseek-ai-DeepSeek-R1-Distill-Qwen-1.5B) [#### Tencent/Tencent: Hunyuan A13B Instruct tencent-hunyuan-a13b-instruct From $0.35/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/tencent/tencent-hunyuan-a13b-instruct) [#### Qwen/Qwen: Qwen3 235B A22B Thinking 2507 qwen-qwen3-235b-a22b-thinking-2507 From $1.26/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/qwen/qwen-qwen3-235b-a22b-thinking-2507) [#### Nous Research/Nous Hermes 2 Mixtral 8X7B Dpo NousResearch-Nous-Hermes-2-Mixtral-8x7B-DPO From $0.60/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/nousresearch/NousResearch-Nous-Hermes-2-Mixtral-8x7B-DPO) [#### Google/Google: Gemini 3.1 Pro Preview google-gemini-3.1-pro-preview From $7.00/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/google/google-gemini-3.1-pro-preview) About Upstage: Solar Pro 4 --- Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive... ### Technical Specifications Model IDupstage-solar-pro4 CategoryLLM Models TaskText Generation Price$0.075 per million tokens AddedAugust 11, 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 Pro 4 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": "upstage-solar-pro4", "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 Pro 4 API costs $0.075 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 Upstage](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [View Pricing](https://modelslab-frontend-v2-927501783998.us-east4.run.app/pricing) Upstage: Solar Pro 4 FAQ --- ### What is Upstage: Solar Pro 4? Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive... ### How do I use the Upstage: Solar Pro 4 API? You can integrate Upstage: Solar Pro 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-pro4" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Upstage: Solar Pro 4 cost? Upstage: Solar Pro 4 costs $0.075 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 Pro 4 model ID? The model ID for Upstage: Solar Pro 4 is "upstage-solar-pro4". Use this ID in your API requests to specify this model. ### Do I need a paid plan to use Upstage: Solar Pro 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 - 2026-08-26*