Request: Custom Claude API Endpoint Support

It would be great if Claude Code allowed custom API keys and endpoints, making it possible to integrate with OpenRouter or a self-hosted AI/LLM gateway.

I would like to use claude code at my work, but we are forced to go through a genAI proxy. Adding a custom endpoint would allow me to access the bedrock models via our proxy service.

The endpoint specified by the company is required at work, and I hope that Claude Code can support it.

I did this, musistudio/claude-code-router this repo can route Claude Code requests to other models.

any updates on official support for this?

If you look here https://www.npmjs.com/package/@anthropic-ai/claude-code?activeTab=code to cli.js
There is ANTHROPIC_BASE_URL in source code. Maybe it is possible to use this in your case.

it's not documented but looks like you can:

export ANTHROPIC_BASE_URL="https://llm.proxy"
export ANTHROPIC_AUTH_TOKEN="some-api-key"

We access our Claude models through Open WebUI which uses Amazon Bedrock instead of a direct connection to Anthropic. I'd like to figure out how to use Claude Code with my Open WebUI user's API Key.

Excuse me, how can I use OpenRouter as an endpoint?

Is there any current way to use Claude Code with Conduit api? I cannot seem to get it working

Unfortunately, being unable to hit a custom endpoint means I can't use claude-code. OpenAI codex lets you set a base url; I guess we're going to end up using that, even though it would be nice to use 3.7 sonnet.

I tried setting ANTHROPIC_BASE_URL - it doesn't seem to do anything.

This is well supported! You can use HTTP_PROXY, HTTPS_PROXY, or ANTHROPIC_BASE_URL for this. See https://docs.anthropic.com/en/docs/claude-code/configuration#environment-variables.

Feel free to re-open if you're still hitting issues.

The HTTP_PROXY and HTTPS_PROXY now only mentioned under Bedrock and Vertex docs:
https://docs.anthropic.com/en/docs/claude-code/bedrock-vertex#environment-variables

The ANTHROPIC_BASE_URL is not mentioned anymore.

@bcherny I'd like to use an bedrock API gateway (https://github.com/aws-samples/bedrock-access-gateway, so basically openai-compatible API) to use sonnet-4. How would I set it up? HTTPS_PROXY doesn't seem to work, I get this error:

Z42 [InvalidArgumentError]: invalid url
    at Object.g_6 [as parseOrigin] (file:///home/mmayer/.npm-global/lib/node_modules/@anthropic-ai/claude-code/cli.js:380:32051)
    at new f82 (file:///home/mmayer/.npm-global/lib/node_modules/@anthropic-ai/claude-code/cli.js:418:8137)
    at sf6 (file:///home/mmayer/.npm-global/lib/node_modules/@anthropic-ai/claude-code/cli.js:418:13484)
    at new BB2 (file:///home/mmayer/.npm-global/lib/node_modules/@anthropic-ai/claude-code/cli.js:418:14481)
    at cp6 (file:///home/mmayer/.npm-global/lib/node_modules/@anthropic-ai/claude-code/cli.js:1364:8422)
    at file:///home/mmayer/.npm-global/lib/node_modules/@anthropic-ai/claude-code/cli.js:1364:8368 {
  code: 'UND_ERR_INVALID_ARG'
}

Is there some guidance somewhere what is required for this and what to set? What I have is the URL to the API, and an API Key.

I tried all sort of combinations of setting ANTHROPIC_AUTH_TOKEN, ANTHROPIC_BASE_URL, ANTHROPIC_API_KEY` but none worked so far.

anyonr got this working

Hi folks, we have some upcoming changes to our documentation that should help clarify the setup here. Generally:

• HTTPS_PROXY and HTTP_PROXY are for http proxies
• ANTHROPIC_BASE_URL is for "LLM gateways", and needs to point to a path that hosts an Anthropic API-format endpoint (/v1/messages), see https://docs.anthropic.com/en/api/messages

Hi folks, we have some upcoming changes to our documentation that should help clarify the setup here. Generally: HTTPS_PROXY and HTTP_PROXY are for http proxies ANTHROPIC_BASE_URL is for "LLM gateways", and needs to point to a path that hosts an Anthropic API-format endpoint (/v1/messages), see https://docs.anthropic.com/en/api/messages

@ant-kurt I see you specified an Anthropic API-format endpoint. Could you please confirm whether or not it should be possible to use Claude through an OpenAI-compatible API?

Our organization is using Anthropic models delivered by AWS Bedrock with Open WebUI. So I'm looking to clarify whether it should be possible to use Claude Code with the OWUI API and if not, should it be possible to use Claude Code directly with AWS Bedrock.

@kintz09 it is not currently possible to use Claude Code with an OAI-compatible API. You can use Claude Code directly with Bedrock, see https://docs.anthropic.com/en/docs/claude-code/amazon-bedrock.

@ant-kurt Thank you for the confirmation!

@kintz09 it is not currently possible to use Claude Code with an OAI-compatible API. You can use Claude Code directly with Bedrock, see https://docs.anthropic.com/en/docs/claude-code/amazon-bedrock.

We have the same use case/issue. Using AWS Bedrock Gateway we'd need to access the Anthropic models via open ai endpoints. Hope this soon gets possible.

thanks @ant-kurt !

is a connection to api.anthropic.com still required (possible through a proxy)?

or can we hit the Vertex anthropic endpoint only?

@max-sixty connection to api.anthropic.com is not necessary when consuming Bedrock or Vertex.

anyone managed ti configured it if yes please share your format.

Connecting to a custom LLM gateway gives me a API Connection Error even though it works witj local host and curl to the url is also giving me a response.

anyone got working method for this?

@akhilbelide make sure your custom gateway serves an Anthropic-format endpoint (/v1/messages).

@akhilbelide make sure your custom gateway serves an Anthropic-format endpoint (/v1/messages).

are you using 3rs party provider?

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