opencode-go bug: gemini-4-argon consistently returns 403 while other Go models work

Mikrobus72 · ghdev · 2026-11-05

Issue #61845 on anomalyco/opencode reports that gemini-4-argon via the OpenCode Go aggregator consistently fails with HTTP 403 "Upstream request failed: Endpoint is unavailable." on both Go and Go Plus plans.

• Other Go models work fine at the same moment, and the same model answers through a different aggregator, isolating the fault to the Argon upstream endpoint behind opencode-go
• The model id resolves correctly (wrong ids return a different error)
• The issue includes a raw curl reproduction; both the OpenAI-compatible and native Google paths return the same 403

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