fix: fall back to OPENROUTER_API_KEY for Anthropic base URL - #4
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When ANTHROPIC_BASE_URL is set (e.g. OpenRouter's Anthropic-compatible endpoint at https://openrouter.ai/api) but ANTHROPIC_API_KEY isn't, use OPENROUTER_API_KEY for the x-api-key header instead of erroring out. OpenRouter's Anthropic skin accepts an OpenRouter key over that header. Requires MEAT_MODEL/-model to name a Claude model so meat takes the Anthropic code path rather than its OpenAI default.
ryan953
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August 4, 2026 00:17
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NewAnthropicFromEnvnow falls back toOPENROUTER_API_KEYfor thex-api-keyheader when
ANTHROPIC_BASE_URLis set butANTHROPIC_API_KEYisn't. OpenRouter'sAnthropic-compatible endpoint (
https://openrouter.ai/api) accepts an OpenRouterkey over that same header, so this lets meat run there using an existing
OPENROUTER_API_KEY+ANTHROPIC_BASE_URLshell setup with no separateANTHROPIC_API_KEYneeded. An explicitANTHROPIC_API_KEYstill always wins, andOPENROUTER_API_KEYalone (withoutANTHROPIC_BASE_URL) does not trigger thefallback.
Note this only applies once meat is already on the Anthropic code path, which
requires
MEAT_MODEL/-modelto name aclaude-*model — otherwise meat'smodel resolution defaults to OpenAI.
Added tests covering the new fallback, the explicit-key precedence, and the
no-
ANTHROPIC_BASE_URLguard.