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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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8 pages for anthropic_foundry_base_url.

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claude-in-microsoft-foundry Claude Developer Platform · in the page build-with-claude/claude-in-microsoft-foundry …Y_RESOURCE` - Your resource name (for example, `example-resource`) * `ANTHROPIC_FOUNDRY_BASE_URL` - Alternative to resource name: the full base URL (for example, `https://example-resource.services.ai.… Environment variables Claude Code CLI · in the page env-vars …| | `ANTHROPIC_FOUNDRY_BASE_URL` | Full base URL for the Microsoft Foundry resource (for example, `https://m… Connect Claude Code to an LLM gateway Claude Code CLI · in the page llm-gateway-connect …Tabs> <Tab title="Bash or Zsh"> ```bash theme={null} export ANTHROPIC_FOUNDRY_BASE_URL=https://llm-gateway.example.com/foundry export ANTHROPIC_FOUNDRY_API_KEY=sk-gateway-key export… Gateway protocol reference Claude Code CLI · in the page llm-gateway-protocol …ages format. Claude Code routes to them through their own variables, `ANTHROPIC_FOUNDRY_BASE_URL` and `ANTHROPIC_AWS_BASE_URL`, but a gateway fronting either implements the Anthropic Messages row abov… Roll out an LLM gateway for your organization Claude Code CLI · in the page llm-gateway-rollout …uses | | `ANTHROPIC_BEDROCK_BASE_URL`, `ANTHROPIC_VERTEX_BASE_URL`, `ANTHROPIC_FOUNDRY_BASE_URL`, or `ANTHROPIC_AWS_BASE_URL` with the [variables for that provider](/docs/en/llm-gateway-connect#route… Claude Code on Microsoft Foundry Claude Code CLI · in the page microsoft-foundry …_FOUNDRY_RESOURCE={resource} # Or provide the full base URL: # export ANTHROPIC_FOUNDRY_BASE_URL=https://{resource}.services.ai.azure.com/anthropic ``` ### 4. Pin model versions <Warning> Pin spec… How Claude Code uses prompt caching Claude Code CLI · in the page prompt-caching …that means their base-URL variables are unset. For Foundry, it means `ANTHROPIC_FOUNDRY_BASE_URL` is unset or points at your resource's `services.ai.azure.com` host, the standard [Microsoft Foundry se… Enterprise deployment overview Claude Code CLI · in the page third-party-integrations …BASE_URL`, `ANTHROPIC_AWS_BASE_URL`, `ANTHROPIC_VERTEX_BASE_URL`, or `ANTHROPIC_FOUNDRY_BASE_URL` environment variables. Learn more in [LLM gateways](/docs/en/llm-gateway). For the per-provider envir…