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## Why Amazon Bedrock's static catalog derives its GPT model definitions from bundled OpenAI model metadata. The GPT-5.6 variants introduced in #30285 clone GPT-5.5, which carries an `availability_nux`; because app-server forwards that metadata through `model/list`, clients can show GPT-5.5 launch copy for a GPT-5.6 Bedrock model. `upgrade` is also model-catalog availability metadata and should not be inherited by provider-specific Bedrock models. ## What changed - Clear `availability_nux` and `upgrade` when constructing static Bedrock GPT models. - Add a regression test asserting that every static Bedrock model omits both fields. ## Testing - `just test -p codex-model-provider`