Console Go (zen/go/v1): hy3-preview 404 'No allowed providers' — requested provider siliconflow not allowed

Summary

hy3-preview fails with HTTP 404 No allowed providers are available for the selected model. The gateway routes to provider siliconflow but the model is only available via gmicloud, and there is no client-side way to select the provider on the Console Go endpoint.

Repro

curl -s https://opencode.ai/zen/go/v1/chat/completions \
  -H "Authorization: Bearer <key>" -H "Content-Type: application/json" \
  -d '{"model":"hy3-preview","messages":[{"role":"user","content":"hi"}],"max_tokens":10}'

Response (reproduced twice, 2026-07-31)

{"error":{"message":"Error from provider: No allowed providers are available for the selected model.","code":404,"metadata":{"available_providers":["gmicloud"],"requested_providers":["siliconflow"]}}}

Impact

• Model listed in /models but always 404s
• Error metadata reveals the routing mismatch but gives no fix — client can't specify gmicloud

Expected

• Route hy3-preview to gmicloud server-side, or allow provider selection via request, or drop from /models

Environment

• Endpoint: https://opencode.ai/zen/go/v1 (Console Go)
• Note: hy3 (non-preview) works on the same key