OpenCode Go: deepseek-v4.1-flash returns 402 insufficient_user_quota from OrcaRouter while Go quota is healthy

Description

deepseek-v4.1-flash via OpenCode Go returns HTTP 402 insufficient_user_quota from an OrcaRouter upstream, while the OpenCode Go account quota is healthy and other Go models work with the same API key/session.

This is the same September wave reported in #37231 (see the 2026-09-19 comment from @hyuri) and #49416.

Steps to reproduce

1. Call OpenCode Go Chat Completions with deepseek-v4.1-flash:

curl https://opencode.ai/zen/go/v1/chat/completions \
  -H "Authorization: Bearer $OPENCODE_GO_API_KEY" \
  -H "Content-Type: application/json" \
  -H "x-opencode-session: <stable-uuid>" \
  -d '{"model":"deepseek-v4.1-flash","messages":[{"role":"user","content":"ping"}],"max_tokens":16,"stream":false,"reasoning_effort":"max"}'

Response: HTTP 402

{"error":{"param":"","type":"insufficient_quota","message":"Upstream request failed: [insufficient_user_quota] You're out of credits — this request needs $0.000076. Add credits to keep going: https://www.orcarouter.ai/console/billing?ref=err_credit_gate#add-credits (request id: 202609190910094345896158268d9d6KTOPRUVn)"}}

2. Check OpenCode Go usage with the same key:

curl https://opencode.ai/zen/go/v1/usage \
  -H "Authorization: Bearer $OPENCODE_GO_API_KEY"

Result: HTTP 200, rolling: 8%, weekly: 52%, monthly: 26% — so the Go account itself is not out of quota.

3. Repeat the same request with other Go models using the same key/session:

Model	Result
deepseek-v4-flash	200
deepseek-v4-pro	200
glm-5.3	200
kimi-k3	200
deepseek-v4.1-flash	402 OrcaRouter insufficient_user_quota

Expected behavior

deepseek-v4.1-flash should either:

• be routed to an OrcaRouter upstream that has credits, or
• fail over to another healthy upstream for the same model, or
• return a clear Go-side error rather than an upstream billing error from a provider account the user does not control.

Screenshot and/or share link

Additional request IDs seen through Codex/CC Switch:

• 202609190906131118841918268d9d6FhC6V16u
• 202609190906121880800248268d9d6CUDOXaQW
• 202609190904513598759728268d9d6Glic6pO9

Operating System

Windows 11

Terminal

PowerShell 7 / Codex via CC Switch 3.20.3 (direct OpenCode Go API calls; not using the OpenCode CLI)

Related

• #37231
• #49416
• #37056

Start by reproducing the Chat Completions request for deepseek-v4.1-flash and compare it with the listed models that return 200; check the /usage endpoint to confirm the account quota is healthy. Trace the OpenCode Go request path for model routing and upstream errors. Done means the model uses a healthy route, fails over, or returns a clear Go-side error instead of OrcaRouter billing details.