Where to Find Your Anthropic Claude API Key
Get programmatic access to Claude Opus, Sonnet, and Haiku

If you're building with Claude, you need an API key from Anthropic's console - not from Claude.ai. The two products are distinct. Your Claude.ai subscription does not give you API access. This guide gets you set up on the right platform.

Prerequisites

• A free account on console.anthropic.com
• A credit card (Anthropic has no free API tier - billing is pay-as-you-go from the first token)

Note: Claude.ai (the chat interface) and the Anthropic API are entirely separate. A Claude Pro subscription gives you access to the chat product, not the API.

Step-by-step: creating your API key

1. Go to console.anthropic.com → sign up or log in
2. In the left sidebar, click "API Keys"
3. Click "Create Key" → give it a meaningful name (e.g., production-app) → click Create
4. Copy the key immediately - it is shown only once. Losing it means creating a new one
5. Set spending limits in "Plans & Billing" to avoid unexpected charges, especially when running autonomous agents

What this key unlocks

With an Anthropic API key, you have access to:

• Claude Opus 4.7 - the most capable model in the family, designed for complex reasoning and multi-step tasks
• Claude Sonnet 4.6 - the best balance of performance and cost for production workloads
• Claude Haiku 4.5 - the fastest and most affordable, ideal for high-volume, latency-sensitive use cases

One important note: Anthropic does not offer image generation or native embeddings through its API. For embeddings with Anthropic models, the standard choice is Voyage AI (voyageai.com), which produces embeddings specifically optimized for Claude retrieval tasks.

Free tier and pricing

There is no free tier for the Anthropic API. Billing starts immediately on a pay-as-you-go basis. You are charged per input and output token, with prices varying by model - Haiku is significantly cheaper than Opus per token. Anthropic does offer volume discounts for high-usage customers.

Security - the non-negotiables

• Never commit your key to git. Store it in a .env file and add .env to your .gitignore
• Restrict by scope if your use case allows - dedicated keys per application make it easier to rotate and audit
• Rotate your key every 90 days, or immediately if you suspect exposure

Using this key with HiWay2LLM

You now have access to the Claude model family. Instead of integrating the Anthropic SDK directly into every project, bring your key to HiWay2LLM. You get unified routing across Claude and 200+ other models, cost tracking per request, budget guardrails, and automatic fallbacks - all through a single OpenAI-compatible endpoint. One integration, every model.