SDK release 7.21.0

The evidence describes a patch release v7.21.0 for the OpenAI Node SDK (sdk:npm/openai@7.21.0) with new features, bug fixes, and chores. It does not indicate deprecation, rate-limit, or a migration/removal endpoint. The release notes include a new feature (session environment reset events), a bug fix (preserve model choices and improve request handling), and documentation-related chores. No explicit deadline or replacement endpoint is mentioned in the provided text.

v7.21.0 ## [7.21.0](https://github.com/openai/openai-node/compare/v7.20.0...v7.21.0) (2026-09-22) ### Features * **api:** add session environment reset events ([#2777](https://github.com/openai/openai-node/issues/2777)) ([5de2360](https://github.com/openai/openai-node/commit/5de2360474aba30a3176ba2dde9ac5e55783efb5)) ### Bug Fixes * **api:** preserve model choices and improve request handling ([#2787](https://github.com/openai/openai-node/issues/2787)) ([a4a4396](https://github.com/openai/openai-node/commit/a4a439633e41880108624460c62bf13fd94c171b)) ### Chores * **api:** document response management resources ([#2775](https://github.com/openai/openai-node/issues/2775)) ([0472fb3](https://github.com/openai/openai-node/commit/0472fb3d9979c238c552da4a7403fe4631e3707b))

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