--- title: Qwen: Qwen3.5 Plus 2026 04 20 | Text Generation | ModelsLab description: Build with Qwen: Qwen3.5 Plus 2026 04 20 API by Qwen. Text generation, chat, code, and reasoning. Pay-per-use. Free tier. url: https://modelslab.com/models/qwen/qwen-qwen3.5-plus-20260420.md canonical: https://modelslab.com/models/qwen/qwen-qwen3.5-plus-20260420.md type: product component: Playground/LLM/Index generated_at: 2026-04-28T08:09:33.807449Z --- Qwen: Qwen3.5 Plus 2026-04-20 --- [LLMs.txt](https://modelslab.com/models/open_router/qwen-qwen3.5-plus-20260420/llms.txt) [.md](https://modelslab.com/models/qwen/qwen-qwen3.5-plus-20260420.md) qwen-qwen3.5-plus-20260420 qwen Closed Source Model $1.400000 / call Qwen: Qwen3.5 Plus 2026-04-20 --- 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 ### Qwen: Qwen3.5 Plus 2026-04-20 qwen qwen-qwen3.5-plus-20260420 Copy model ID PricingInput $0.40 / 1M tokens Output $2.40 / 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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It accepts text, image, and video input and produces text output, with a 1M token context window. This... ### Technical Specifications Model IDqwen-qwen3.5-plus-20260420CategoryLLM ModelsTaskText GenerationPrice$1.400000 per million tokensAddedApril 27, 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 Qwen: Qwen3.5 Plus 2026-04-20 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": "qwen-qwen3.5-plus-20260420", "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.com/models/qwen/qwen-qwen3.5-plus-20260420/api) for SDKs, code examples in Python, JavaScript, and more. ### Pricing Qwen: Qwen3.5 Plus 2026-04-20 API costs $1.400000 per million tokens. Pay only for what you use with no minimum commitments. [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 Qwen](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing) Qwen: Qwen3.5 Plus 2026-04-20 FAQ --- ### What is Qwen: Qwen3.5 Plus 2026-04-20? Qwen3.5 Plus (April 2026) is a large-scale multimodal language model from Alibaba. It accepts text, image, and video input and produces text output, with a 1M token context window. This... ### How do I use the Qwen: Qwen3.5 Plus 2026-04-20 API? You can integrate Qwen: Qwen3.5 Plus 2026-04-20 into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "qwen-qwen3.5-plus-20260420" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Qwen: Qwen3.5 Plus 2026-04-20 cost? Qwen: Qwen3.5 Plus 2026-04-20 costs $1.400000 per million tokens. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started. ### What is the Qwen: Qwen3.5 Plus 2026-04-20 model ID? The model ID for Qwen: Qwen3.5 Plus 2026-04-20 is "qwen-qwen3.5-plus-20260420". Use this ID in your API requests to specify this model. ### Does Qwen: Qwen3.5 Plus 2026-04-20 have a free tier? Yes, ModelsLab offers a free tier that lets you try Qwen: Qwen3.5 Plus 2026-04-20 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 - 2026-04-28*