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/ Claude Code CLI Environment Variables
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March 8, 2026 16:56
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| # Claude Code CLI Environment Variables | |
| # This file lists all environment variables used in v2.1.63 with explanations | |
| ## Anthropic API & Authentication | |
| ANTHROPIC_API_KEY - Primary API key for Anthropic's Claude API. Used as fallback when no OAuth token is configured. | |
| ANTHROPIC_AUTH_TOKEN - Alternative bearer token for Anthropic services. Takes priority over ANTHROPIC_API_KEY for authorization headers. | |
| ANTHROPIC_BASE_URL - Custom base URL for Anthropic API endpoints. Overrides the default api.anthropic.com endpoint. | |
| ANTHROPIC_CUSTOM_HEADERS - Custom HTTP headers for API requests. Newline-separated Key: Value pairs. | |
| ANTHROPIC_BETAS - Comma-separated list of beta feature headers to include in API requests. Appended to internal beta flags. |
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| 1000003550543360041 | |
| 1000005325434405024 | |
| 1000005828797026376 | |
| 1000009995930325042 | |
| 1000022592855494752 | |
| 1000042916598792202 | |
| 1000047991090057286 | |
| 1000051979684425848 | |
| 1000052266042142770 |