release: 6.22.1

[stainless-app]

Automated Release PR

6.22.1 (2026-02-21)

Full Changelog: v6.22.0...v6.22.1

Chores

• internal/client: fix form-urlencoded requests (646cedd)
• update mock server docs (29f78f3)

Documentation

• api: document 2000 file limit in file-batches create parameters (ff7bde0)
• api: enhance method descriptions across audio/chat/skills/videos/responses (f5e02a1)
• api: update safety_identifier description in chat/responses (a55e0ef)

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Accept parameterized form content types

The new form-encoding branch only runs when content-type is exactly application/x-www-form-urlencoded, so requests using equivalent valid values like application/x-www-form-urlencoded; charset=utf-8 (or different media-type casing) still fall through to JSON encoding, producing a body/header mismatch. This means a common caller configuration still sends invalid payloads for form endpoints even after this fix.

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