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Eca does not work with OpenCode via the openai-responses, nor with openai-chat #652
Description
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When using eca-emacs with OpenCode I get the error message:
Short description
[OPENAI] Unexpected response status: %s body: %s 400 {"type":"error","error":{"type":"ModelProtocolUnsupported","message":"Model does not support this protocol."}}
To reproduce
- Start eca (eca-desktop or eca-emacs) with the following configuration. The session-id is hardcoded just to see if it works
{
"providers": {
"opencode": {
"api": "openai-responses",
"url": "https://opencode.ai/inference/",
"key": "<my-token>",
"extraHeaders": {
"User-Agent": "eca-emacs/1.0",
"x-opencode-session": "e64b8abe-c1d6-4ac9-89c2-8f5ac9a3886c"
},
"models": {
"big-pickle": {}
}
}
}
}- The model list is updated. Select a model e.g. claude-sonnet-5.5
- Type in a small prompt like "Summarize current project".
The above error appears. The session id and all the data appear correctly in the logs on OpenCode. The error message there is
{
"event": {
"id": "<id>",
"requestID": "<id>",
"workspaceID": "org_<workspace id>",
"startedAt": 1792165205881,
"finishedAt": 1792165206017,
"durationMs": 136,
"outcome": "rejected",
"category": "inference",
"protocol": "openai-responses",
"product": "standard",
"path": "/inference/v1/responses",
"method": "POST",
"stream": true,
"sessionID": "e64b8abe-c1d6-4ac9-89c2-8f5ac9a3886c",
"userAgent": "eca-emacs/1.0",
"userID": "user_<my-user-id>",
"requestedModel": "claude-sonnet-5-5",
"model": "claude-sonnet-5-5",
"provider": "opencode",
"statusCode": 400,
"errorCode": "inference_failed",
"errorMessage": "The inference request failed.",
"reasoningMode": "effort",
"reasoningEffort": "medium",
"country": "CZ",
"region": "Plzeň Region",
"city": "Pilsen",
"requestHeaders": {
"content-length": "26163",
"content-type": "application/json",
"user-agent": "eca-emacs/1.0",
"x-opencode-session": "e64b8abe-c1d6-4ac9-89c2-8f5ac9a3886c"
},
"metadata": {},
"attemptCount": 0,
"attempts": []
}
}
Expected behavior
I expect the assistant to respond with the project summary.
Doctor
ECA version: 0.165.0
Server cmd: /home/joh/.emacs.d/eca/eca server
Workspaces: /home/joh/Devel/Lights/lumio
Default model: opencode/big-pickle (API key (oc_**********XtS))
Logged providers: None
Relevant env vars:
XDG_ACTIVATION_TOKEN=kwi*****-79
DEBUGINFOD_URLS=https://debuginfod.archlinux.org
Additional notes
- Maybe this is related to ECA chat does not work with Opencode Go #649.
- I tried also to use openai-chat. The setup above was the only one that let me discover the available models.
Activity
ericdallo commentedon Oct 20, 2026
@johannes-mueller this looks like a different problem which happens because depending on the model opencode requries a different api, you can try something like this:
{ "providers": { "opencode": { "api": "openai-chat", "url": "https://opencode.ai/inference/openai/v1", "key": "${env:OPENCODE_API_KEY}", "extraHeaders": {"User-Agent": "eca/1.0", "x-opencode-session": "<uuid>"}, "fetchModels": false, "models": {"big-pickle": {}, "kimi-k3": {}} }, "opencode-claude": { "api": "anthropic", "url": "https://opencode.ai/inference/anthropic", "key": "${env:OPENCODE_API_KEY}", "extraHeaders": {"User-Agent": "eca/1.0", "x-opencode-session": "<uuid>"}, "fetchModels": false, "models": {"claude-sonnet-5-5": {}} }, "opencode-gpt": { "api": "openai-responses", "url": "https://opencode.ai/inference/openai", "key": "${env:OPENCODE_API_KEY}", "extraHeaders": {"User-Agent": "eca/1.0", "x-opencode-session": "<uuid>"}, "fetchModels": false, "models": {"gpt-5.5": {}} } } }