Anthropic key

Bring your own Anthropic key

Add your sk-ant key once. Claude models then run on your Anthropic plan and limits, billing stays on your Anthropic account, and one AnyRouter endpoint can fall back to other models.

Read the BYOK docs Anthropic key setup Claude Code

What this is for

You already pay Anthropic, and your plan has its own limits and billing. Add that key to AnyRouter and keep one endpoint and one API for every tool, with other models ready if Claude is busy or you hit a limit.

Steps, then copy

1.Open Dashboard → BYOK → Add key.
2.Pick Anthropic and paste your sk-ant-… key.
3.Press Test key. It checks the key and the models you picked.
4.Save the key.
5.Call anthropic/claude-… models with your AnyRouter key, from curl or from Claude Code with anyr claude.

curl · anthropic/claude-sonnet-4-6

bash

curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-sonnet-4-6",
    "messages": [{ "role": "user", "content": "Say hello in one sentence." }]
  }'

Claude Code · anyr claude

bash

curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr claude --model anthropic/claude-sonnet-4-6

What you will see

The BYOK page in the dashboard with the Add key button at the top right — Dashboard → BYOK → Add key.

The upstream list with the Anthropic key menu open and Add your key (BYOK) highlighted — You can also open the key menu on the Anthropic row and choose Add your key.

The Anthropic key dialog after Test key, showing 7 of 7 checks passed with the key auth check passing — Test key checks the key and each model you picked, then you press Add.

The Saved keys tab showing the new Anthropic key as Active, with an On switch and a trash icon — The saved key is Active. Use the On switch to pause it or the trash icon to remove it.

Good to know

Your key is encrypted at rest and used only to route your own requests.
Test key makes a tiny call to Anthropic for each model you picked. Nothing is saved until you press Add key.
A key that has not passed a test is saved paused and does not route.
To turn a key off, open the Anthropic key list on the BYOK page and switch the key to Off. Traffic moves to your other keys or to AnyRouter credits.
To remove a key, open the same list and use the trash icon. The key is deleted for good.

Ready to try it

The guide has the full walkthrough. Sign up if you still need a key.

Read the BYOK docs Start free