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/ Claude Code CLI Environment Variables
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July 9, 2026 02:30
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| # Claude Code CLI Environment Variables | |
| # This file lists all environment variables used in v2.1.202 with explanations | |
| ## Anthropic API & Authentication | |
| ANTHROPIC_API_KEY - Primary API key for Anthropic's Claude API; used as an auth source (source "ANTHROPIC_API_KEY") when no OAuth token is configured | |
| ANTHROPIC_AUTH_TOKEN - Alternative bearer token for Anthropic services; sent as Authorization: Bearer and takes priority over ANTHROPIC_API_KEY, also used with gateway mode | |
| ANTHROPIC_BASE_URL - Custom base URL for the Anthropic API; overrides the default api.anthropic.com endpoint (a non-api.anthropic.com host marks the client as non-first-party) | |
| ANTHROPIC_BETAS - Comma-separated list of beta feature headers appended (trimmed, non-empty) to the internal beta flags on API requests | |
| ANTHROPIC_CUSTOM_HEADERS - Custom HTTP headers for API requests, parsed as newline-separated "Key: Value" pairs |
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| 1000003550543360041 | |
| 1000005325434405024 | |
| 1000005828797026376 | |
| 1000009995930325042 | |
| 1000022592855494752 | |
| 1000042916598792202 | |
| 1000047991090057286 | |
| 1000051979684425848 | |
| 1000052266042142770 | |
| 1000056137988702258 |