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The API endpoint for muse-spark-1.2-contributor is unreachable #44627
Description
Description
I received a response without any issues using the opencode CLI. (This is the standard version, not the free version.)
Muse Spark 1.2 Contributor · 3.1s
Does anyone know the cause and how to fix it? Is this a server-side issue?
- location: japan (This country is not subject to API service restrictions.)
- os: windows 11 enterprise latest
- terminal: windows terminal, wezterm (latest)
- shell: pwsh(latest)
- curl 8.21.0 (Windows) libcurl/8.21.0 Schannel zlib/1.3.2 WinIDN WinLDAP
ocgo official endpoint: https://opencode.ai/zen/go/v1/chat/response
$KEY = (Get-Content "D:\OpenCode_api_key.txt" -Raw).Trim(); '{"model":"muse-spark-1.2-contributor","messages":[{"role":"user","content":"say:a"}]}' | Set-Content -Encoding ascii "$env:TEMP\ocbody.json"; curl.exe -sS -i --max-time 30 -H "Authorization: Bearer $KEY" -H "Content-Type: application/json" -d "@$env:TEMP\ocbody.json" https://opencode.ai/zen/go/v1/chat/response
HTTP/1.1 404 Not Found
Date: Mon, 24 Aug 2026 05:57:50 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Cf-Placement: remote-ORD
Server: cloudflare
CF-RAY: a3001f2c5c1d5ecd-PDX
<ocgo 404 not found page html raw>
endpoint https://opencode.ai/zen/go/v1/chat/completions
$KEY = (Get-Content "D:\OpenCode_api_key.txt" -Raw).Trim(); '{"model":"muse-spark-1.2-contributor","messages":[{"role":"user","content":"say:a"}]}' | Set-Content -Encoding ascii "$env:TEMP\ocbody.json"; curl.exe -sS -i --max-time 30 -H "Authorization: Bearer $KEY" -H "Content-Type: application/json" -d "@$env:TEMP\ocbody.json" https://opencode.ai/zen/go/v1/chat/completions
HTTP/1.1 500 Internal Server Error
Date: Mon, 24 Aug 2026 05:55:26 GMT
Content-Type: text/plain;charset=UTF-8
Content-Length: 75
Connection: keep-alive
Cf-Placement: remote-ORD
Server: cloudflare
CF-RAY: a3001bad3a95e653-DEN
{"type":"error","error":{"type":"error","message":"Internal server error"}}
mimo-v2.5 is 200 ok
$KEY = (Get-Content "D:\OpenCode_api_key.txt" -Raw).Trim(); '{"model":"mimo-v2.5","messages":[{"role":"user","content":"only say->a"}],"max_tokens":5}' | Set-Content -Encoding ascii "$env:TEMP\ocbody.json"; curl.exe -sS -i --max-time 30 -H "Authorization: Bearer $KEY" -H "Content-Type: application/json" -d "@$env:TEMP\ocbody.json" https://opencode.ai/zen/go/v1/chat/completions
HTTP/1.1 200 OK
Date: Mon, 24 Aug 2026 07:32:24 GMT
Content-Type: application/json
Content-Length: 479
Connection: keep-alive
Cf-Placement: remote-ORD
Server: cloudflare
CF-RAY: a300a98a48027537-SEA
Plugins
No response
OpenCode version
latset
Steps to reproduce
No response
Screenshot and/or share link
No response
Operating System
windows11 latest
Terminal
windows terminal, wezterm latest
Activity
github-actions commentedon Aug 24, 2026
This issue might be a duplicate of existing issues. Please check:
DevonGithub commentedon Aug 24, 2026
I reproduced this and isolated the failing path further.
Environment:
muse-spark-1.2-contributorResults:
Muse works normally inside the OpenCode app.
Direct request to the Responses API works:
POST https://opencode.ai/zen/go/v1/responseswith:
model: muse-spark-1.2-contributorResult:
HTTP 200status: completedSo the model, account, API key and OpenCode Go access are all working.
/v1/chat/completionsResult:
HTTP 500Internal server erroradapter: openai-chatmodel: muse-spark-1.2-contributorstream: trueThis therefore appears isolated to Muse + the Chat Completions API path.
The OpenCode Go documentation currently lists Muse Spark 1.2 Contributor under
/v1/responses, and our direct test confirms that endpoint works.Possible fixes:
muse-spark-1.2-contributorwork correctly through/v1/chat/completions, orThis also seems related to the existing Muse Chat Completions streaming/schema issues, but in this case the request fails immediately with HTTP 500 before a usable response is returned.
Tao-Yida commentedon Aug 27, 2026
I also reproduced this 500 Error on Codex via OpenCodex v2.33.0. For me, muse-spark-1.2-contributor on OpenCode Go returns 500 in log yet showing "we're currently experiencing high demand, which may cause temporary errors", and muse-spark-1.2-free on OpenCode Zen returns 401 Invalid API Key. However, on OpenCode TUI both two models work well. During the first day of Muse I found it glitches on Codex because of the different schema it uses. Hope they can fix it soon because my quota is running out.
superuser7777 commentedon Aug 28, 2026
Is the OpenCode team looking at this issue?
Several days have passed, but the situation hasn't changed at all.
To help isolate the problem, I'd like to know whether it's an OpenCode issue or a Meta issue.
Tarquinen commentedon Oct 20, 2026
Thanks for the report! Muse Spark is served on the
/responsesendpoint, not/chat/completionsor/chat/response. Each Go model is available on the endpoint listed for it in the Go docs: https://opencode.ai/v2/docs/console/go#endpointsAs confirmed in the comments, requests to
/responseswork. Note that Muse is also only available in some regions. Closing this issue.— from 𝕺𝖕𝖊𝖓𝕮𝖔𝖉𝖊