Console Go (zen/go/v1): mimo-v2-pro and mimo-v2-omni always fail with 'Upstream request failed'

Summary

mimo-v2-pro and mimo-v2-omni are listed in GET /zen/go/v1/models but every completion request fails with invalid_request_error: Upstream request failed. Persistent across repeated attempts and timeouts (30s/60s).

Repro

curl -s https://opencode.ai/zen/go/v1/chat/completions \
  -H "Authorization: Bearer <key>" -H "Content-Type: application/json" \
  -d '{"model":"mimo-v2-pro","messages":[{"role":"user","content":"hi"}],"max_tokens":10}'

Response (6/6 attempts failed, 2026-07-31)

{"error":{"message":"Error from provider (Console Go): Upstream request failed","type":"invalid_request_error","param":null,"code":"invalid_request_error"}}

Impact

• Both models listed as available but are unusable → agent auto-fallback wastes turns retrying
• Sibling models mimo-v2.5-pro / mimo-v2.5 work fine on the same key

Expected

• Either fix upstream routing, or remove/replace these models in /models until healthy

Environment

• Endpoint: https://opencode.ai/zen/go/v1 (Console Go)
• Same key successfully used for 20+ other models on the same endpoint