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Replace the separate STRIX_AUTH_MODE flag with a sentinel model value: STRIX_LLM=openai/subscription selects the authenticated ChatGPT subscription, and any other value is a normal API-key model. The env vars that already run Strix are now the single source of truth — no second mode to keep in sync. Encapsulate the behavior instead of branching everywhere: - StrixProvider.get_model routes the sentinel to a _CodexResponsesModel backed by a cached OAuth client (no global default-client mutation, no per-call client churn). - _CodexResponsesModel self-enforces the backend's requirements — streaming, store=false, encrypted reasoning, and the configured reasoning effort — so the runner, warm-up, and make_model_settings no longer special-case subscription. Remove now-unneeded machinery: STRIX_AUTH_MODE/AuthMode, the "incompatible model" warning, the non-OpenAI model coercion, the make_model_settings codex flag, and the global set_default_openai_client wiring. run.json still records a derived auth_mode so the viewer/telemetry/cost display are unchanged. Switching modes is now just editing STRIX_LLM. Sentinel-only (no per-model override): a subscription run uses gpt-5.4. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>