Codex 0.154 puts GPT-6 Astra in the picker; Claude Code pins to 2.1.267; MAI-Code-1-Flash leaves Copilot today.
openai/codex rust-v0.154.0 (22:35 UTC 9 Sep): GPT-6 Astra in the model picker and Amazon Bedrock catalogs; experimental --worktree / /worktree isolated checkouts; inline answers while a turn runs; Windows background server. Deprecated codex mcp-server entry point is gone.1
Claude Code v2.1.267 (19:58 UTC 9 Sep): maxEffortLevel cap across Bedrock/Vertex/Foundry; --system-prompt-snapshot off; a long list of prompt-cache, resume, MCP, and VS Code fixes after yesterday's 2.1.266 gateway pin. npm dist-tags: latest/next 2.1.267, stable still 2.1.236.23
MAI-Code-1-Flash is off Copilot as of today (10 Sep). Enterprise Copilot admins also get GA managed permissions for agent shell/file/network ops that users cannot weaken.4
Codex users who want Astra: ≥0.154.0. Claude Code: pin ≥2.1.267. Expect MAI-Code-1-Flash gone from Copilot. Copilot Business/Enterprise admins: review agent permission policies.