Feature Request: Support custom Anthropic base URL (ANTHROPIC_BASE_URL) #1067
Description
Feature Request
Problem
There is no way to configure a custom Anthropic base URL.
Users running local LLM gateways (e.g. Bifrost, LiteLLM) that expose
an Anthropic-compatible endpoint cannot use them as a drop-in replacement.
Requested Change
Add support for an ANTHROPIC_BASE_URL environment variable (similar to
how OPENAI_BASE_URL is supported) so users can point the Anthropic
provider to a custom endpoint.
Expected Behavior
Setting:
ANTHROPIC_BASE_URL=http://my-gateway:8080/anthropic
...should route all Anthropic API calls to that endpoint instead of
https://api.anthropic.com
Use Case
- Local LLM gateways (Bifrost, LiteLLM, etc.)
- Corporate proxies
- Self-hosted Anthropic-compatible endpoints
Workaround
Currently forced to use the Custom OpenAI provider which has
JSON parsing issues with Claude models wrapping responses in markdown fences.