--- title: Anthropic: Claude Opus 4.6 (Fast) | Text Generation | ModelsLab description: Build with Anthropic: Claude Opus 4.6 (Fast) API by Anthropic. Text generation, chat, code, and reasoning. Pay-per-use. Free tier. url: https://modelslab.com/models/anthropic/anthropic-claude-opus-4.6-fast/api.md canonical: https://modelslab.com/models/anthropic/anthropic-claude-opus-4.6-fast/api.md type: product component: Playground/LLM/Index generated_at: 2026-04-15T02:19:48.396357Z --- Anthropic: Claude Opus 4.6 (Fast) --- [LLMs.txt](https://modelslab.com/models/open_router/anthropic-claude-opus-4.6-fast/llms.txt) [.md](https://modelslab.com/models/anthropic/anthropic-claude-opus-4.6-fast.md) anthropic-claude-opus-4.6-fast anthropic Closed Source Model $90.000000 / call Anthropic: Claude Opus 4.6 (Fast) --- 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 ### Anthropic: Claude Opus 4.6 (Fast) anthropic anthropic-claude-opus-4.6-fast Copy model ID PricingInput $30.00 / 1M tokens Output $150.00 / 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 Related Models --- Discover similar models you might be interested in [View all LLM Models](https://modelslab.com/models?feature=llmaster) [Q1](https://modelslab.com/models/together_ai/Qwen-Qwen2.5-1.5B)[Together AI](https://modelslab.com/models/together_ai) [Qwen2.5 1.5B Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen2.5-1.5B) [MM](https://modelslab.com/models/open_router/mistralai-ministral-3b-2512)[Open Router](https://modelslab.com/models/open_router) [Mistral: Ministral 3 3B 2512 Closed Source Model](https://modelslab.com/models/open_router/mistralai-ministral-3b-2512) [OG](https://modelslab.com/models/open_router/openai-gpt-4o-extended)[Open Router](https://modelslab.com/models/open_router) [OpenAI: GPT-4o (extended) Closed Source Model](https://modelslab.com/models/open_router/openai-gpt-4o-extended) [OG](https://modelslab.com/models/open_router/openai-gpt-4o-mini-2024-07-18)[Open Router](https://modelslab.com/models/open_router) [OpenAI: GPT-4o-mini (2024-07-18) Closed Source Model](https://modelslab.com/models/open_router/openai-gpt-4o-mini-2024-07-18) [QQ](https://modelslab.com/models/open_router/qwen-qwen3.6-plus)[Open Router](https://modelslab.com/models/open_router) [Qwen: Qwen3.6 Plus Closed Source Model](https://modelslab.com/models/open_router/qwen-qwen3.6-plus) [![Gemini 2.5 Flash Image Preview ](https://images.stablediffusionapi.com/?Image=https://assets.modelslab.ai/generations/97c6f065-57f9-45b0-a190-08e5f97f70a8.png)](https://modelslab.com/models/google/gemini-2.5-flash-image-preview)[Google](https://modelslab.com/models/google) [Gemini 2.5 Flash Image Preview Closed Source Model](https://modelslab.com/models/google/gemini-2.5-flash-image-preview) [OG](https://modelslab.com/models/open_router/openai-gpt-4-turbo)[Open Router](https://modelslab.com/models/open_router) [OpenAI: GPT-4 Turbo Closed Source Model](https://modelslab.com/models/open_router/openai-gpt-4-turbo) [MM](https://modelslab.com/models/open_router/mistralai-mistral-small-2603)[Open Router](https://modelslab.com/models/open_router) [Mistral: Mistral Small 4 Closed Source Model](https://modelslab.com/models/open_router/mistralai-mistral-small-2603) [NN](https://modelslab.com/models/open_router/nvidia-nemotron-nano-9b-v2-free)[Open Router](https://modelslab.com/models/open_router) [NVIDIA: Nemotron Nano 9B V2 (free) Closed Source Model](https://modelslab.com/models/open_router/nvidia-nemotron-nano-9b-v2-free) [ZG](https://modelslab.com/models/open_router/z-ai-glm-4-32b)[Open Router](https://modelslab.com/models/open_router) [Z.ai: GLM 4 32B Closed Source Model](https://modelslab.com/models/open_router/z-ai-glm-4-32b) [BE](https://modelslab.com/models/open_router/baidu-ernie-4.5-21b-a3b)[Open Router](https://modelslab.com/models/open_router) [Baidu: ERNIE 4.5 21B A3B Closed Source Model](https://modelslab.com/models/open_router/baidu-ernie-4.5-21b-a3b) [OO](https://modelslab.com/models/open_router/openai-o3-mini)[Open Router](https://modelslab.com/models/open_router) [OpenAI: o3 Mini Closed Source Model](https://modelslab.com/models/open_router/openai-o3-mini) [AC](https://modelslab.com/models/open_router/anthropic-claude-3.7-sonnet)[Open Router](https://modelslab.com/models/open_router) [Anthropic: Claude 3.7 Sonnet Closed Source Model](https://modelslab.com/models/open_router/anthropic-claude-3.7-sonnet) [OG](https://modelslab.com/models/open_router/openai-gpt-5.1-codex-mini)[Open Router](https://modelslab.com/models/open_router) [OpenAI: GPT-5.1-Codex-Mini Closed Source Model](https://modelslab.com/models/open_router/openai-gpt-5.1-codex-mini) [NN](https://modelslab.com/models/open_router/nvidia-nemotron-nano-9b-v2)[Open Router](https://modelslab.com/models/open_router) [NVIDIA: Nemotron Nano 9B V2 Closed Source Model](https://modelslab.com/models/open_router/nvidia-nemotron-nano-9b-v2) [GG](https://modelslab.com/models/open_router/google-gemma-3n-e4b-it-free)[Open Router](https://modelslab.com/models/open_router) [Google: Gemma 3n 4B (free) Closed Source Model](https://modelslab.com/models/open_router/google-gemma-3n-e4b-it-free) [ZG](https://modelslab.com/models/open_router/z-ai-glm-4.7-flash)[Open Router](https://modelslab.com/models/open_router) [Z.ai: GLM 4.7 Flash Closed Source Model](https://modelslab.com/models/open_router/z-ai-glm-4.7-flash) [QV](https://modelslab.com/models/together_ai/Qwen-Qwen2.5-VL-72B-Instruct)[Together AI](https://modelslab.com/models/together_ai) [Qwen2.5-VL (72B) Instruct Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen2.5-VL-72B-Instruct) About Anthropic: Claude Opus 4.6 (Fast) --- Fast-mode variant of \[Opus 4.6\](/anthropic/claude-opus-4.6) - identical capabilities with higher output speed at premium 6x pricing. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode ### Technical Specifications Model IDanthropic-claude-opus-4.6-fastCategoryLLM ModelsTaskText GenerationPrice$90.000000 per million tokensAddedApril 7, 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 Anthropic: Claude Opus 4.6 (Fast) 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": "anthropic-claude-opus-4.6-fast", "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/anthropic/anthropic-claude-opus-4.6-fast/api) for SDKs, code examples in Python, JavaScript, and more. ### Pricing Anthropic: Claude Opus 4.6 (Fast) API costs $90.000000 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 Anthropic](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing) Anthropic: Claude Opus 4.6 (Fast) FAQ --- ### What is Anthropic: Claude Opus 4.6 (Fast)? Fast-mode variant of \[Opus 4.6\](/anthropic/claude-opus-4.6) - identical capabilities with higher output speed at premium 6x pricing. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode ### How do I use the Anthropic: Claude Opus 4.6 (Fast) API? You can integrate Anthropic: Claude Opus 4.6 (Fast) into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "anthropic-claude-opus-4.6-fast" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Anthropic: Claude Opus 4.6 (Fast) cost? Anthropic: Claude Opus 4.6 (Fast) costs $90.000000 per million tokens. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started. ### What is the Anthropic: Claude Opus 4.6 (Fast) model ID? The model ID for Anthropic: Claude Opus 4.6 (Fast) is "anthropic-claude-opus-4.6-fast". Use this ID in your API requests to specify this model. ### Does Anthropic: Claude Opus 4.6 (Fast) have a free tier? Yes, ModelsLab offers a free tier that lets you try Anthropic: Claude Opus 4.6 (Fast) 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 - 2026-04-15*