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Pickaxe
pickaxe.co › post › how-to-get-your-claude-api-key-a-step-by-step-guide
How to get your Claude API key: A step-by-step guide (2025) - Pickaxe Blog
An API key serves as a unique identifier that lets you connect to your Anthropic account (the company that created Claude) and access their models like Claude Sonnet and Claude Opus....
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Claude
claude.com › platform › api
Claude Developer Platform | Claude
Allow Claude to interact with hundreds of external tools and APIs so it can perform a wider range of tasks.
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DataCamp
datacamp.com › tutorial › claude-sonnet-api-anthropic
Claude Sonnet 3.5 API Tutorial: Getting Started With Anthropic's API | DataCamp
June 26, 2024 - Let’s take it step-by-step. ... Visit the Anthropic Console and create an account. You'll need to provide basic information and verify your email. ... Once your account is set up, navigate to Get API keys section and click Create Key to generate your API key.
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Zapier
zapier.com › productivity › app tips
Claude API: How to get a key and use the API
July 8, 2024 - Claude keeps some legacy models still running. You can still call them to see what results you get, even though the pricing is fairly high when compared with Haiku and Sonnet. ... When creating a new developer account, you can get $5 free to play around with when you verify your account with a phone number. This credit is consumed every time you use the Workbench—the tool to try out new prompts—as well as any time you run an API call to Anthropic's servers.
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OpenRouter
openrouter.ai › anthropic › claude-sonnet-4.5
Claude Sonnet 4.5 - API, Providers, Stats | OpenRouter
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
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Puter
developer.puter.com › tutorials › free-unlimited-claude-35-sonnet-api
Free, Unlimited Claude API
1 month ago - No API keys or sign-ups are required. To generate text using Claude, use the puter.ai.chat() function with your preferred model. Here's a full code example using Claude Sonnet 4.5:
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Apidog
apidog.com › blog › claude-opus-4-sonnet-4-api
How to Access Claude Opus 4 and Claude Sonnet 4 API
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 ...
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Apidog
apidog.com › blog › claude-3-7-sonnet-api
How to Access Claude 3.7 Sonnet API and Test Using Apidog
October 18, 2025 - Anthropic offers various plans, including Free, Pro, Team, and Enterprise, with Claude 3.7 Sonnet available across all except the free tier for extended thinking mode. After logging in, navigate to the API section. Generate an API key, which ...
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Chatbase
chatbase.co › blog › claude-api
How to Access and Use the Claude API
To interact with the Claude 3.5 Sonnet API, you will need an API key.
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Apidog
apidog.com › blog › claude-sonnet-4-5-api
How to Use the Claude Sonnet 4.5 API
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....
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Reddit
reddit.com › r/windsurf › bring your own key to access claude sonnet 4 & opus 4 models
r/windsurf on Reddit: Bring your Own Key to access Claude Sonnet 4 & Opus 4 Models
May 23, 2025 -

BYOK (Anthropic Key) Support Added!

You can now bring your own Anthropic API key to access Claude 4 models in Cascade:

- Claude Sonnet 4 & Claude Sonnet 4 (Thinking)

- Claude Opus 4 & Claude Opus 4 (Thinking)

To enable: Go to "provide API keys" → input your Anthropic key → reload Windsurf window.

Available now for Free and Pro users!

See full changelog: https://windsurf.com/changelog

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Apidog
apidog.com › blog › claude-3-5-api
Claude 3.5 API: Latest Information and Beginner's Tutorial!
July 31, 2025 - To use the API, you need access rights to the Claude 3.5 Sonnet API. Switch to the Header tab and enter the access token in x-api-key.
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OpenRouter
openrouter.ai › anthropic › claude-sonnet-4
Claude Sonnet 4 - API, Providers, Stats | OpenRouter
Sonnet 4 is optimized for practical everyday use, providing advanced reasoning capabilities while maintaining efficiency and responsiveness in diverse internal and external scenarios. ... Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length. ... OpenRouter provides an OpenAI-compatible completion API to 400+ models & providers that you can call directly, or using the OpenAI SDK.
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Elephas
elephas.app › blog › how-to-get-claude-api-key-step-by-step-guide-or-2024-clxvepzbb00084gdk5z5kixqp
How to Get Claude API Key (Step by Step Guide) | 2025
February 9, 2025 - 2. Navigate to API Keys: Locate the "API Keys" section, typically under your profile settings. 3. Create a New Key: Click the "Create Key" button and assign a descriptive name for easy identification.
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DataCamp
datacamp.com › tutorial › claude-3-7-sonnet-api
Claude 3.7 Sonnet API: A Guide With Demo Project | DataCamp
February 25, 2025 - To connect through the Claude 3.5 Sonnet API, obtain your API key from Anthropic, install the anthropic Python library, and use it to send requests and receive responses from Claude 3.5 Sonnet.
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Claude AI Hub
claudeaihub.com › claude-api-key
Claude API Key Guide | How to Get and Use It | Claude AI Hub
November 5, 2024 - This cURL command sends a request to the API, querying Claude 3.5 Sonnet for a summary based on the user’s input. The model processes the request and returns a structured response. For developers who prefer using Python, here’s how to make an API call using the requests library: import requests import json API_KEY = 'YOUR_API_KEY' url = 'https://api.anthropic.com/v1/messages' headers = { 'Content-Type': 'application/json', 'x-api-key': API_KEY, 'anthropic-version': '2024-10-01' } data = { "model": "claude-3-5-sonnet-20241022", "max_tokens": 1024, "messages": [ { "role": "user", "content": "Explain the concept of reinforcement learning in simple terms."
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Medium
medium.com › @enricdomingo › claude-sonnet-3-5-api-integrating-the-best-llm-into-our-app-7ec4623e2dac
Claude 3.5 Sonnet API: This is how you integrate the best LLM into your APP | by Enric Domingo - AI Engineering | Medium
June 23, 2024 - Generate an API key in the Get API keys section. The good news is that in order to start using the Claude API we won’t need to put our credit card this time, our account starts with $5 to start playing around with it.
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Reddit
reddit.com › r/claudeai › use claude 3.5 sonnet through the api if you're running into rate limits
r/ClaudeAI on Reddit: Use Claude 3.5 Sonnet through the API if you're running into rate limits
May 15, 2024 -

I highly recommend using Claude 3.5 Sonnet through the API - you won't have rate limits, and with its cheaper cost you'll likely be spending less than a subscription to Claude Pro!

There's lots of open source web platforms that let you use your own API Key to do this. Albeit you won't get to use the artifacts feature.

I have a free native iOS app that supports chatting to Claude 3.5 Sonnet (and all other LLMs) using your own API Key which you could use: https://apps.apple.com/us/app/pal-chat-ai-chat-client/id6447545085?platform=iphone

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Alexcodes
alexcodes.app › docs › keys › adding-claude-anthropic-api-key
Adding your API Key for Claude (Anthropic) - Alex Sidebar
To use Claude’s models (such as Claude 3.5 Sonnet and Claude 3.7 Sonnet) in Xcode with Alex Sidebar without paying a subscription for Alex, you’ll need an Anthropic API key.