# NousResearch/hermes-agent · Fallback ignores API mode, causes 500 errors

## Open now

- Nothing open on GitHub.

A bug where fallback activation ignores the opencode_model_api_mode setting, routing Responses-only models through the wrong endpoint and producing deterministic 500 errors. The accompanying fixes attempt to honor that setting during fallback selection.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #113442. Verify it addresses your case.
- **Recommended:** read PR #113442 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-113442`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.67`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #102148: \[Bug\] Fallback activation ignores opencode_model_api_mode — Responses-only models (muse-spark) on opencode-go sent via /chat/completions → deterministic 500

## Prior & competing PRs

- **#113442: fix(fallback): OpenCode fallback entries land on the model's wire — Muse Spark no longer 500s on /chat/completions (#102148, salvage #102229)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/chat_completion_helpers.py`, `tests/agent/test_fallback_api_mode_preservation.py`
- **#102229: fix(agent): honor opencode_model_api_mode in fallback activation (fixes #102148)**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `6eef5ea0bbe266a9f4e472c3569a243c185bd7dc`, `#113442`

## Fix status

- Merged to main in PR #113442 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-16`.