Codex Python SDK 0.154.0 adds max and ultra reasoning effort
OpenAI
After Codex CLI 0.154.0 (Sep 9, covered yesterday), the matching Python SDK 0.154.0 shipped September 10: it introduces max and ultra reasoning-effort values, an ExternalMessage type for tool-authority-only joins, include_turns on resume/fork, and typed hook payloads.
Why it matters
The SDK's ExternalMessage type and new effort tiers hint at richer programmatic embedding of Codex sessions, keeping pace with Claude Code and Cursor workflows.
Importance: 2/5
SDK release adding new effort tiers and embedding primitives