fix: Codex model discovery returned unusable gpt-5.5-*-wm slugs - #1981
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…real Codex CLI client_version Model discovery hit chatgpt.com/backend-api/models (the ChatGPT web-app catalog) with client_version=osaurus-<bundle version>. The web catalog recently began serving experiment slugs like gpt-5.5-cca-wm / gpt-5.5-wm, which pass the gpt-X.Y slug filter, replace the static fallback list, and then fail on /backend-api/codex/responses — leaving ChatGPT-auth users with only unusable models. Point discovery at the Codex catalog (/backend-api/codex/models, matching codex-rs's CHATGPT_CODEX_BASE_URL) and send a pinned Codex CLI semver (0.144.1), since the backend silently filters the catalog for unknown or stale client_version values.
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Summary
Users signed in with ChatGPT/Codex auth reported their model list suddenly changed to
gpt-5.5-cca-wmandgpt-5.5-wm, both unusable. Root cause: Osaurus fetched the model catalog from the wrong endpoint with aclient_versionthe backend doesn't recognize.https://chatgpt.com/backend-api/codex/models(matching codex-rs'sCHATGPT_CODEX_BASE_URL) instead ofhttps://chatgpt.com/backend-api/models. The latter is the ChatGPT web-app catalog, which recently began serving internal experiment slugs (*-wm); those pass the^gpt-\d+\.\d+slug filter, fully replace the static fallback list, and then fail on/backend-api/codex/responses.client_versionis now a pinned Codex CLI semver constant (codexClientVersion = "0.144.1") instead ofosaurus-<bundle version>. The backend silently filters the catalog for unknown/stale versions, so the constant is documented with when to bump it./backend-api/codex/responsespath; only discovery changed.Added regression tests pinning the discovery URL path and the semver format of
client_version.Test plan
swift test --filter OpenAICodexOAuthServiceTests— 14/14 pass (includes 2 new regression tests)swift test --filter "RemoteProviderManagerTestConnectionTests|ProviderNetworkDiagnosticsTests"— 13/13 pass