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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview, Comment	Mar 20, 2026 1:43am

All committers have signed the CLA.

Merging this PR will not alter performance

✅ 16 untouched benchmarks

_{Comparing devin-petersohn:feat/anthropic-auth-token-and-base-url (3a0652c) with main (2900e0e)}

Greptile Summary

This PR adds support for two environment variables that mirror the official Anthropic Python SDK: ANTHROPIC_AUTH_TOKEN (sent as Authorization: Bearer) and ANTHROPIC_BASE_URL (fallback for the API base URL). The change is applied consistently across the main completion path, batches, files, skills, the experimental messages pass-through, and the proxy passthrough endpoint.

Key changes:

• New AnthropicModelInfo.get_auth_token() and get_auth_header() static helpers centralise credential resolution; get_auth_header correctly routes OAuth tokens (sk-ant-oat*) to Authorization: Bearer and regular API keys to x-api-key
• validate_environment in common_utils.py now falls back to ANTHROPIC_AUTH_TOKEN when no API key is found, and raises a helpful error message mentioning both variables
• get_api_base and batches/main.py both add ANTHROPIC_BASE_URL as a lower-priority fallback after ANTHROPIC_API_BASE
• ANTHROPIC_AUTH_TOKEN is added to the Sentry denylist to prevent secret leakage
• The proxy passthrough endpoint no longer hard-codes x-api-key: "None" when the API key is absent
• Comprehensive mock-only unit tests cover all new code paths

Minor inconsistencies:

• Error messages in litellm/llms/anthropic/batches/transformation.py (line 48) and litellm/llms/anthropic/files/handler.py (line 89) still only mention ANTHROPIC_API_KEY, leaving users unaware of the new ANTHROPIC_AUTH_TOKEN alternative
• litellm/utils.py validate_environment checks for both env vars but missing_keys.append("ANTHROPIC_API_KEY") (lines 6166 and ~6399) still reports only ANTHROPIC_API_KEY in the missing-key diagnostic

Confidence Score: 4/5

• Safe to merge — no regressions in the core auth path; remaining issues are minor error-message inconsistencies.
• The central get_auth_header helper is correct and well-tested. OAuth token routing, credential precedence, and the passthrough x-api-key: None bug are all properly addressed. The only open items are two stale error strings that don't mention ANTHROPIC_AUTH_TOKEN (in batches/transformation.py and files/handler.py) and the missing_keys diagnostic in utils.py — none of which affect runtime correctness.
• litellm/llms/anthropic/batches/transformation.py and litellm/llms/anthropic/files/handler.py have error messages that still only reference ANTHROPIC_API_KEY; litellm/utils.py appends only ANTHROPIC_API_KEY to missing_keys.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Caller provides api_key] --> B{get_auth_header}
    B --> C{get_api_key\nresolves ANTHROPIC_API_KEY}
    C -->|key found| D{is_anthropic_oauth_key?}
    D -->|yes| E["Authorization: Bearer {key}"]
    D -->|no| F["x-api-key: {key}"]
    C -->|not found| G{get_auth_token\nresolves ANTHROPIC_AUTH_TOKEN}
    G -->|token found| H["Authorization: Bearer {token}"]
    G -->|not found| I[return None → raise error]

    subgraph Base URL Resolution
        J[api_base param] -->|fallback chain| K["ANTHROPIC_API_BASE env"]
        K -->|fallback| L["ANTHROPIC_BASE_URL env"]
        L -->|fallback| M["https://api.anthropic.com"]
    end

_{Last reviewed commit: "Merge branch 'main' ..."}