# NousResearch/hermes-agent · Codex client version compatibility with model catalog

## Open now

- Nothing open on GitHub.

These items relate to how the Codex client advertises its version to the catalog, and a reported HTTP 400 error when a model rejects the client version despite valid credentials. The theme centers on client version negotiation and catalog compatibility.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 0 merged PR(s), 2 PR(s) closed without merging.
- No fix has been merged to main; one or more PRs were attempted (see below).
- **Recommended:** review the prior/competing PR(s) below. A fix was attempted but not merged; your case may extend or revive that work.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `unresolved`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #81558: \[Bug\]: openai-codex / gpt-5.6-sol returns HTTP 400 "model not supported" despite valid OAuth, valid version (v0.19.1), and working Codex CLI on the same account

## Prior & competing PRs

- **#81576: fix(agent): advertise Codex client version from catalog minimal_client_version**. closed without merge
  - maintainer direction: category `uncategorized`; implication `needs_llm`
- **#86288: fix(codex): advertise catalog-compatible client version**. closed without merge
  - maintainer direction: category `wontfix_bydesign`; implication `wontfix`; refs `0e02b2c3d479`, `#81558`

## Fix status

- No merged fix on record.
- Subsystem: `agent`