Claude Platform adds keyless OIDC auth

This is a security-first upgrade that moves Claude closer to cloud-native auth patterns developers already use elsewhere, which should matter more to teams running CI, batch jobs, and internal agents than a cosmetic API tweak.

• –Removes long-lived keys from the highest-risk path: CI, automation, and service-to-service calls
• –Fits common enterprise identity stacks, so adoption should be easier than inventing another secrets workflow
• –Makes Claude Code and SDK auth feel like infrastructure, not a special-case developer exception
• –The real win is operational: fewer rotated secrets, fewer leaks, and cleaner auditability for machine identities
• –Anthropic is signaling that platform maturity now includes identity and access plumbing, not just model quality