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OpenCode Zen lists GPT 5.6 Terra but cannot run it #38624
Description
Description
opencode/gpt-5.6-terra is listed as an available OpenCode Zen model but fails reproducibly at runtime.
Three consecutive minimal requests failed before any generation started. All returned the same Zen gateway error:
Error: No provider available
HTTP 401
{"type":"error","error":{"type":"ModelError","message":"No provider available"}}
The request reached the documented Responses endpoint:
https://opencode.ai/zen/v1/responses
This is not a local missing-credential issue:
- opencode auth list shows OpenCode Zen api as configured.
- opencode models opencode lists opencode/gpt-5.6-terra.
- Zen documentation lists GPT 5.6 Terra and /zen/v1/responses as its endpoint.
Reproduction
opencode run --model opencode/gpt-5.6-terra "Reply exactly: OK"
Expected: OK
Actual: immediate HTTP 401 with ModelError: No provider available; zero input/output tokens.
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github-actions commentedon Jul 24, 2026
This issue might be a duplicate of existing issues. Please check:
If your issue is distinct from those (e.g., specific to the
gpt-5.6-terramodel), please add a comment clarifying what distinguishes it.muenker80 commentedon Jul 24, 2026
This is distinct from the linked issues:
opencode/gpt-5.6-terra, not free models ([BUG]: OpenCode Zen free models hy3-free and nemotron-3-ultra-free failing while deepseek-v4-flash-free works #38028).CreditsErrorregression in v2: Opencode Zen models return CreditsError while works with v1 #37161.HTTP 401 ModelError: No provider available, notUpstream request failedas in All paid OpenCode Zen models fail with 'Upstream request failed' — free models work #36506.I verified that the local Zen credential is configured and that
opencode/gpt-5.6-terrais listed byopencode models opencode.The three failed requests occurred at 2026-07-23 15:53:34, 15:54:08, and 15:54:15 UTC with Cloudflare Ray IDs
a1fbdbd28ff49de8-CMH,a1fbdca7ab0770f3-CMH, anda1fbdcd70fb98f93-BOS.github-actions commentedon Sep 24, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.