OpenCode Go gateway returns 500 on POST /zen/go/v1/chat/completions (all models, all keys) #40453

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1. github-actions

   assigned

   fwang

   on Aug 4, 2026
2. github-actions commented on Aug 4, 2026

   

   github-actionsBot

   on Aug 4, 2026 – with GitHub Actions

   Contributor

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   This issue might be a duplicate of existing issues. Please check:

   • opencode-go (Console Go) provider returns 400/401/500 for subscribed models #37056: opencode-go (Console Go) provider returns 400/401/500 for subscribed models — reports the same HTTP 500 on POST /zen/go/v1/chat/completions alongside other error codes
   • opencode go return 500 error when using codebuddy #35906: opencode go return 500 error — same 500 Internal Server Error on the same endpoint
   • OpenCode Go service (zen/go/v1) frequent intermittent outages — HTTP 000 / 503 / Cloudflare 524 #36889: OpenCode Go service frequent intermittent outages (503/524) — related infrastructure-level failures on the same service

   If your issue is distinct (e.g. the 500 is consistently reproducible now rather than intermittent, or persists after those issues are resolved), please note that in the issue.
3. VOE9 commented on Aug 31, 2026

   

   VOE9

   on Aug 31, 2026

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   Additional reproduction from Kali Linux — muse-spark-1.2-contributor

   Confirming this on opencode-go/muse-spark-1.2-contributor. Same signature as the
   original report: GET /zen/go/v1/models returns 200, but every POST to
   /chat/completions returns 500 at the Cloudflare edge.

   Environment

   • OS: Kali Linux
   • opencode: v1.18.25
   • Provider/model: opencode-go / muse-spark-1.2-contributor (free)
   • Region: Iraq

   Direct curl reproduction

   Valid API key, explicit reasoning.effort: "medium" — instant HTTP 500:

   curl -i -X POST https://opencode.ai/zen/go/v1/chat/completions \
     -H "Authorization: Bearer sk-***" \
     -H "Content-Type: application/json" \
     -d '{"model":"muse-spark-1.2-contributor","messages":[{"role":"user","content":"hi"}],"reasoning":{"effort":"medium"}}'

   Response:

   HTTP/2 500
   date: Mon, 31 Aug 2026 15:09:03 GMT
   content-type: text/plain;charset=UTF-8
   server: cloudflare
   cf-ray: a33cf442afea7a8c-CLT
   
   {"type":"error","error":{"type":"error","message":"Internal server error"}}

   Note the content-type: text/plain on a JSON body — consistent with the edge
   generating this response rather than the upstream model service.

   Ruled out locally

   • Auth token valid; network path healthy.
   • Disabled local MCP servers (kali, kali-tools) — no change.

   Client-side symptom

   In the TUI the request hangs with the spinner running, then flips to
   interrupted with no error surfaced, while local context is still consumed.
   This matches the "sub-agent timeout, no error" behaviour described in the
   original report, and is likely amplified by the unbounded 5xx retry policy
   tracked in #25041.

   Separate finding (possibly unrelated to the 500)

   From ~/.local/share/opencode/log/, the background title generator sends
   reasoning.effort: "none", which this model rejects with a 400:

   [invalid_request_error] "reasoning.effort" does not support "none" with this model.
   

   Filing here for visibility since it also affects muse-*, but it is a distinct
   failure class from the gateway 500 above. Happy to open it separately if
   preferred.

   Question

   Is the 500 region-gated? muse-spark-1.2-contributor is documented as
   "available in select regions", and #43692 shows a RegionError for
   unsupported countries. If the gateway is collapsing that check into a generic
   500, a clearer error would save a lot of debugging time.
4. thdxr commented on Oct 11, 2026

   

   thdxr

   on Oct 11, 2026

   Member

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   Thanks for the report! OpenCode 2.0 is now out and development is focused on V2, so we're closing issues filed against OpenCode 1. Please upgrade (opencode upgrade --major, details: https://anoma.ly/notes/opencode-2-0), and if this is still relevant on 2.0, reopen this issue or open a new one with your 2.0 version.

   — from 𝕺𝖕𝖊𝖓𝕮𝖔𝖉𝖊
5. thdxr

   closed this as not plannedon Oct 11, 2026