--- title: Anthropic: Claude Fable 5 API | Text Generation | ModelsLab description: Build with Anthropic: Claude Fable 5 API by Anthropic. Text generation, chat, code, and reasoning. Pay-per-use. Free tier. url: https://modelslab.com/models/anthropic/anthropic-claude-fable-5.md canonical: https://modelslab.com/models/anthropic/anthropic-claude-fable-5.md type: product component: Playground/LLM/Index generated_at: 2026-06-10T03:10:56.674645Z --- Anthropic: Claude Fable 5 --- [LLMs.txt](https://modelslab.com/models/open_router/anthropic-claude-fable-5/llms.txt) [.md](https://modelslab.com/models/anthropic/anthropic-claude-fable-5.md) Anthropic: Claude Fable 5 --- 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 Fable 5 anthropic anthropic-claude-fable-5 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.com/models?feature=llmaster) [#### open\_router/Anthropic: Claude Opus 4 anthropic-claude-opus-4 From $45.00/M tokens](https://modelslab.com/models/open_router/anthropic-claude-opus-4) [#### together\_ai/GLM 5 Fp4 zai-org-GLM-5 From $2.10/M tokens](https://modelslab.com/models/together_ai/zai-org-GLM-5) [#### open\_router/StepFun: Step 3.5 Flash stepfun-step-3.5-flash From $0.20/M tokens](https://modelslab.com/models/open_router/stepfun-step-3.5-flash) [#### mistral\_ai/Mistral Small (24B) Instruct 25.01 mistralai-Mistral-Small-24B-Instruct-2501 From $0.20/M tokens](https://modelslab.com/models/mistral_ai/mistralai-Mistral-Small-24B-Instruct-2501) [#### open\_router/Meta: Llama 3.1 70B Instruct meta-llama-llama-3.1-70b-instruct From $0.40/M tokens](https://modelslab.com/models/open_router/meta-llama-llama-3.1-70b-instruct) [#### open\_router/Prime Intellect: INTELLECT-3 prime-intellect-intellect-3 From $0.65/M tokens](https://modelslab.com/models/open_router/prime-intellect-intellect-3) [#### open\_router/AionLabs: Aion-1.0 aion-labs-aion-1.0 From $6.00/M tokens](https://modelslab.com/models/open_router/aion-labs-aion-1.0) [#### meta/Llama 3.1 Nemotron 70B Instruct HF nvidia-Llama-3.1-Nemotron-70B-Instruct-HF From $0.88/M tokens](https://modelslab.com/models/meta/nvidia-Llama-3.1-Nemotron-70B-Instruct-HF) [#### open\_router/Qwen: Qwen3 VL 8B Instruct qwen-qwen3-vl-8b-instruct From $0.29/M tokens](https://modelslab.com/models/open_router/qwen-qwen3-vl-8b-instruct) [#### open\_router/Tencent: Hy3 preview tencent-hy3-preview From $0.14/M tokens](https://modelslab.com/models/open_router/tencent-hy3-preview) [#### open\_router/Qwen: Qwen3.6 35B A3B qwen-qwen3.6-35b-a3b From $0.57/M tokens](https://modelslab.com/models/open_router/qwen-qwen3.6-35b-a3b) [#### open\_router/StepFun: Step 3.7 Flash stepfun-step-3.7-flash From $0.68/M tokens](https://modelslab.com/models/open_router/stepfun-step-3.7-flash) [#### open\_router/Anthropic: Claude 3.5 Haiku anthropic-claude-3.5-haiku From $2.40/M tokens](https://modelslab.com/models/open_router/anthropic-claude-3.5-haiku) [#### open\_router/Xiaomi: MiMo-V2.5-Pro xiaomi-mimo-v2.5-pro From $0.65/M tokens](https://modelslab.com/models/open_router/xiaomi-mimo-v2.5-pro) [#### open\_router/OpenAI: GPT-3.5 Turbo openai-gpt-3.5-turbo From $1.00/M tokens](https://modelslab.com/models/open_router/openai-gpt-3.5-turbo) [#### marin/Marin 8B Instruct marin-community-marin-8b-instruct From $0.22/M tokens](https://modelslab.com/models/marin/marin-community-marin-8b-instruct) [#### open\_router/Poolside: Laguna XS.2 (free) poolside-laguna-xs.2-free Free](https://modelslab.com/models/open_router/poolside-laguna-xs.2-free) [#### open\_router/Xiaomi: MiMo-V2-Flash xiaomi-mimo-v2-flash From $0.20/M tokens](https://modelslab.com/models/open_router/xiaomi-mimo-v2-flash) Open Source Alternatives --- Explore open-source models that offer similar capabilities with full transparency and flexibility [View all open source models](https://modelslab.com/models?feature=llm&provider=open-source-models) [MU](https://modelslab.com/models/modelslab/uncensored-chat)[ModelsLab](https://modelslab.com/models/modelslab) [Modelslab: Uncensored Chat Open Source Model](https://modelslab.com/models/modelslab/uncensored-chat) About Anthropic: Claude Fable 5 --- Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and... ### Technical Specifications Model IDanthropic-claude-fable-5 CategoryLLM Models TaskText Generation Price$30 per million tokens AddedJune 9, 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 Fable 5 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-fable-5", "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 Fable 5 API costs $30.000000 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 Fable 5 FAQ --- ### What is Anthropic: Claude Fable 5? Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and... ### How do I use the Anthropic: Claude Fable 5 API? You can integrate Anthropic: Claude Fable 5 into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "anthropic-claude-fable-5" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Anthropic: Claude Fable 5 cost? Anthropic: Claude Fable 5 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 Fable 5 model ID? The model ID for Anthropic: Claude Fable 5 is "anthropic-claude-fable-5". Use this ID in your API requests to specify this model. ### Does Anthropic: Claude Fable 5 have a free tier? Yes, ModelsLab offers a free tier that lets you try Anthropic: Claude Fable 5 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 - 2026-06-10*