OpenCode Zen/Go API chat completions returning 500 Internal Server Error

[fangshijie99]

Description

https://github.com/anomalyco/opencode/issues/new

Description

The OpenCode Zen/Go chat completions API is broken. All POST requests to /zen/v1/chat/completions return HTTP 500 Internal Server Error, regardless of model or API key used.

Steps to Reproduce

1. Send POST request to https://opencode.ai/zen/v1/chat/completions
2. Include a valid OpenCode Go subscription API key (sk-...) in the Authorization header
3. Set body to any model (tested: deepseek-v4-flash-free, minimax-m2.7, gpt-4o-mini)
4. Response: HTTP 500 with body {"type":"error","error":{"type":"error","message":"Internal server error"}}

What Works

• GET https://opencode.ai/zen/v1/models — returns 200 with full model list (50 models)
• GET https://opencode.ai/zen/go/v1/models — returns 200 with Go model list (20 models)
• https://opencode.ai homepage — loads fine

What Doesn't Work

• POST https://opencode.ai/zen/v1/chat/completions — returns HTTP 500 (all models, both API keys)
• POST https://opencode.ai/zen/go/v1/chat/completions — returns HTTP 000 / connection failure
• POST https://opencode.ai/v1/chat/completions — returns HTTP 404

Notes

• Two different OpenCode Go subscription keys were tested, both produce the same 500 error
• Even the free model (deepseek-v4-flash-free) returns 500
• The model listing endpoints work fine, suggesting only the inference backend is affected
• API keys format: correct (sk- prefix), freshly generated

Plugins

No response

OpenCode version

No response

Steps to reproduce

No response

Screenshot and/or share link

https://github.com/anomalyco/opencode/issues/new

Operating System

Windows11

Terminal

Windows cmd PowerShell

[github-actions]

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

• Zen: claude-opus-4-6 returns 500 Internal Server Error on every request (other Claude models work with same key) #30283: Zen API returning 500 Internal Server Error on every request (similar symptom: all POST to chat/completions returning 500)
• [BUG] opencode-go qwen3.7-max intermittently returns 500 Internal server error on text requests #30310: opencode-go intermittently returns 500 Internal Server Error on requests
• [OpenCode Go] 多模态模型全部无法接收图片 — HTTP 500 Internal Server Error #33942: OpenCode Go HTTP 500 Internal Server Error on inference requests

If your issue is the same as one of those, please add a comment there instead so we can consolidate the discussion. If it is a distinct problem, please clarify what makes it different.

[leirbag4]

same here with deepseek v4 flash on windows 11

[joseavilasg]

same, not working

[fwang]

should work now

[wick3dr0se]

also same.. yesterday and day prior was experiencing Cloudflare outages and now receiving random 500 internal server errors. seems servers are struggling or something

[weiyentan]

having problems here

[nejaz1]

Same, having trouble here with all models.
OpenCode's API server reported an internal server error: {"type":"error","error":{"type":"error","message":"Internal server error"}}

[danigogri]

how can i solve this?