Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. Run Claude Sonnet 4.5 with API

“We're seeing state-of-the-art coding performance from Claude Sonnet 4.5, with significant improvements on longer horizon tasks.

September 30, 2025 - Anthropic makes the Claude Sonnet ... an account on the Anthropic Console. Once registered, they navigate to the Account Settings section to generate an API key....

How can I assist you today?", "refusal": null, "annotations": null, "audio": null, "tool_calls": null }, "finish_reason": "stop", "logprobs": null } ], "model": "anthropic/claude-sonnet-4.5", "usage": { "prompt_tokens": 137, "completion_tokens": 914, "total_tokens": 1051, "completion_tokens_details": null, "prompt_tokens_details": null } } ... import requests import json # for getting a structured output with indentation response = requests.post( "https://api.aimlapi.com/v1/chat/completions", headers={ # Insert your AIML API Key instead of <YOUR_AIMLAPI_KEY>: "Authorization":"Bearer <YOUR_AIMLAPI_KEY>", "Content-Type":"application/json" }, json={ "model":"anthropic/claude-sonnet-4.5", "messages":[ { "role":"user", "content":"Hello" # insert your prompt here, instead of Hello } ] } ) data = response.json() print(json.dumps(data, indent=2, ensure_ascii=False))

September 29, 2025 - Complete guide to Claude Sonnet 4.5: pricing, capabilities, setup with TypingMind, and real-world use cases. Access Anthropic models with your own API key.

October 17, 2025 - Click “Add Token” at the API token in the personal center, get the token key: sk-xxxxx and submit. Select the “claude-sonnet-4-5-20250929-thinking”or “claude-sonnet-4-5-20250929","claude-sonnet-4-5” endpoint to send the API request ...

Build with Claude-Sonnet-4.5 using the Poe API · Start by creating an API key, for use with any bot on Poe:Generate API key · Code samples · Python (OpenAI SDK)Node.js (OpenAI SDK)cURLPython (Poe SDK) python · ParametersCopy ·

October 8, 2025 - 🧩 What You Get Access To: • GPT-5 by OpenAI • Claude-Sonnet-4.5 & Claude-Opus-4.1 by Anthropic • GLM-4.6 by Zhipu AI • DeepSeek-r1 & DeepSeek-v3.1

Pricing for Sonnet 4.5 starts at $3 per million input tokens and $15 per million output tokens, with up to 90% cost savings with prompt caching and 50% cost savings with batch processing. To learn more, check out our pricing page. To get started, simply use claude-sonnet-4-5 via the Claude API.

curl https://api.anthropic.com/v1/messages \ -H "Content-Type: application/json" \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-01" \ -d '{ "model": "claude-sonnet-4-5", "max_tokens": 1000, "messages": [ { "role": "user", "content": "What should I search for to find the latest developments in renewable energy?"

The following examples show how to use the Messages API to send requests to Claude Sonnet 4.5, by using both Microsoft Entra ID authentication and API key authentication methods.

September 29, 2025 - Getting started To begin working with Claude Sonnet 4.5, you can access it through Amazon Bedrock using the correct model ID. A good practice is to use the Amazon Bedrock Converse API to write code once and seamlessly switch between different models, making it easier to experiment with Sonnet 4.5 or any of the other models available in Amazon Bedrock.

September 29, 2025 - I have set up my Claude Code with the API key. You can see the setup here: Make sure Python is installed, and then open your terminal. To install the Claude Agent SDK, run: ... Note: If you encounter a CLINotFoundError, make sure you have installed the CLI above and that Claude is included in your PATH. We will now build three simple projects using the Claude Agent SDK as a framework, Claude code for tools and computer use, and Claude Sonnet 4.5 as our AI model.

August 6, 2025 - Understanding the Claude 4 Model Family ArchitecturePrerequisites and Account Setup RequirementsCreating Your Anthropic Developer AccountAPI Key Generation and ManagementClaude Opus 4 API Integration GuideBasic API Request StructureAdvanced Configuration ParametersClaude Sonnet 4 API ImplementationOptimizing for Performance and CostReal-time Integration PatternsAuthentication and Security Best PracticesImplementing Secure Authentication PatternsMonitoring and Logging StrategiesTesting Claude 4 APIs with ApidogSetting Up Apidog for Claude TestingAdvanced Testing ScenariosCost Management and Billing ConsiderationsToken Usage OptimizationBudget Monitoring and AlertsProduction Deployment ConsiderationsScalability and Load ManagementMonitoring and MaintenanceFuture Considerations and RoadmapStaying Updated with API ChangesConclusion

Claude Sonnet 4.5 is available everywhere today. If you’re a developer, simply use claude-sonnet-4-5 via the Claude API.

May 26, 2025 - Developers can access Claude Sonnet ... ; claude-sonnet-4-20250514-thinking) and Claude Opus 4 API (model: claude-opus-4-20250514; claude-opus-4-20250514-thinking)etc through CometAPI. To begin, explore the model’s capabilities in the Playground and consult the API guide for detailed instructions. Before accessing, please make sure you have logged in to CometAPI and obtained the API key. ... Gemini 3 Pro (Google/DeepMind) and Claude Opus 4.5 (Anthropic) ...

modelstring · enumRequiredPossible values: anthropic/claude-sonnet-4claude-sonnet-4claude-sonnet-4-20250514

These services provide API access to coding-optimized models that integrate with popular AI coding tools like Cursor, Continue.dev, Cline, and others. They don't provide standalone coding tools but offer the AI backend for existing tools. ... Works with Continue.dev, Cline, Cursor, etc. ... Access to multiple models (GPT-5.1-Codex-Max, GPT-4.1, Claude Opus 3.5, Gemini 2.0 Flash, Grok Code Fast 1) ... Multiple premium models: Claude 4 Sonnet (Beta), Claude 3.7 Sonnet, Claude 3.5 Sonnet, Gemini 2.5 Pro, GPT‑4.1, GPT‑4o