--- title: Anthropic: Claude Opus 4.8 (Fast) | Text Generation | ModelsLab description: Build with Anthropic: Claude Opus 4.8 (Fast) API by Anthropic. Text generation, chat, code, and reasoning. Pay-per-use. Free tier. url: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/anthropic/anthropic-claude-opus-4.8-fast.md canonical: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/anthropic/anthropic-claude-opus-4.8-fast.md type: product component: Playground/LLM/Index generated_at: 2026-06-30T00:04:52.840562Z --- Anthropic: Claude Opus 4.8 (Fast) --- [LLMs.txt](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/anthropic-claude-opus-4.8-fast/llms.txt) [.md](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/anthropic/anthropic-claude-opus-4.8-fast.md) Anthropic: Claude Opus 4.8 (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 4.8 (Fast) anthropic anthropic-claude-opus-4.8-fast Copy model ID PricingInput $10.00 / 1M tokens Output $50.00 / 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-frontend-v2-927501783998.us-east4.run.app/models?feature=llmaster) [#### open\_router/Anthropic: Claude Sonnet 4 anthropic-claude-sonnet-4 From $9.00/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/anthropic-claude-sonnet-4) [#### open\_router/MythoMax 13B gryphe-mythomax-l2-13b From $0.06/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/gryphe-mythomax-l2-13b) [#### open\_router/OpenAI: GPT-4o-mini Search Preview openai-gpt-4o-mini-search-preview From $0.38/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/openai-gpt-4o-mini-search-preview) [#### together\_ai/Qwen3.5 397B A17b Qwen-Qwen3.5-397B-A17B From $2.10/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/together_ai/Qwen-Qwen3.5-397B-A17B) [#### open\_router/Mistral: Mistral Medium 3 mistralai-mistral-medium-3 From $1.20/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/mistralai-mistral-medium-3) [#### open\_router/Meta: Llama 4 Scout meta-llama-llama-4-scout From $0.20/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/meta-llama-llama-4-scout) [#### open\_router/MoonshotAI: Kimi K2 0711 moonshotai-kimi-k2 From $1.44/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/moonshotai-kimi-k2) [#### open\_router/Cohere: Command R7B (12-2024) cohere-command-r7b-12-2024 From $0.09/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/cohere-command-r7b-12-2024) [#### open\_router/NVIDIA: Nemotron 3 Nano 30B A3B nvidia-nemotron-3-nano-30b-a3b From $0.13/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/nvidia-nemotron-3-nano-30b-a3b) [#### open\_router/MiniMax: MiniMax M3 minimax-minimax-m3 From $0.75/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/minimax-minimax-m3) [#### open\_router/MiniMax: MiniMax-01 minimax-minimax-01 From $0.65/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/minimax-minimax-01) [#### open\_router/OpenAI: GPT-4o (2024-11-20) openai-gpt-4o-2024-11-20 From $6.25/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/openai-gpt-4o-2024-11-20) [#### open\_router/Nex AGI: Nex-N2-Pro nex-agi-nex-n2-pro From $0.63/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/nex-agi-nex-n2-pro) [#### open\_router/Google: Gemma 3n 4B google-gemma-3n-e4b-it From $0.09/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/google-gemma-3n-e4b-it) [#### together\_ai/Kimi K2.6 Fp4 moonshotai-Kimi-K2.6 From $2.85/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/together_ai/moonshotai-Kimi-K2.6) [#### open\_router/TheDrummer: Rocinante 12B thedrummer-rocinante-12b From $0.38/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/thedrummer-rocinante-12b) [#### open\_router/Z.ai: GLM 5 Turbo z-ai-glm-5-turbo From $2.60/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/z-ai-glm-5-turbo) [#### open\_router/Cohere: Command A cohere-command-a From $6.25/M tokens](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/cohere-command-a) Open Source Alternatives --- Explore open-source models that offer similar capabilities with full transparency and flexibility [View all open source models](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models?feature=llm&provider=open-source-models) [MU 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: Uncensored Chat Open Source Model](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/modelslab/uncensored-chat) About Anthropic: Claude Opus 4.8 (Fast) --- Fast-mode variant of \[Opus 4.8\](/anthropic/claude-opus-4.8) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode ### Technical Specifications Model IDanthropic-claude-opus-4.8-fast CategoryLLM Models TaskText Generation Price$30 per million tokens AddedMay 28, 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 4.8 (Fast) 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": "anthropic-claude-opus-4.8-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}") ``` ### Pricing Anthropic: Claude Opus 4.8 (Fast) API costs $30.000000 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 Anthropic](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [View Pricing](https://modelslab-frontend-v2-927501783998.us-east4.run.app/pricing) Anthropic: Claude Opus 4.8 (Fast) FAQ --- ### What is Anthropic: Claude Opus 4.8 (Fast)? Fast-mode variant of \[Opus 4.8\](/anthropic/claude-opus-4.8) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. 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 4.8 (Fast) API? You can integrate Anthropic: Claude Opus 4.8 (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-4.8-fast" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Anthropic: Claude Opus 4.8 (Fast) cost? Anthropic: Claude Opus 4.8 (Fast) costs $30.000000 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 4.8 (Fast) model ID? The model ID for Anthropic: Claude Opus 4.8 (Fast) is "anthropic-claude-opus-4.8-fast". Use this ID in your API requests to specify this model. ### Does Anthropic: Claude Opus 4.8 (Fast) have a free tier? Yes, ModelsLab offers a free tier that lets you try Anthropic: Claude Opus 4.8 (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 - 2026-06-30*