v4.55.0

4.55.0 (2026-08-31)

Features

• api: add compute_units to Responses and Chat Completions usage (#944) (3e45ffb)
• auth: add X.509 token exchange (#940) (df0c88d)
• integrate X.509 workload identity with OkHttp clients (#948) (9684d52)

Bug Fixes

• auth: bind X.509 bearer attachment to its mTLS transport (#949) (5f3ab4a)
• bind X.509 transport clients to trusted origins (#946) (bccb100)
• ci: preserve release source in Maven provenance (#951) (0382c7c), closes #950
• ci: reduce Maven publish runner pressure (#953) (02b2d0d)
• fail closed when protected X.509 verification cannot run (#945) (24089bd)