GPT-6 Astra reaches coding tools: GA in GitHub Copilot, Codex CLI 0.153 makes it the default
OpenAI
GPT-6 Astra reached general availability in GitHub Copilot on Sep 4 per the official GitHub changelog, while Codex CLI shipped 0.153.0-0.153.4 on Sep 3-4 rolling Astra through the stack — API config (0.153.1), Amazon Bedrock picker (0.153.3), then bundled default (0.153.4). The Codex releases also add vim-mode undo/redo, a plugin CLI that installs from remote marketplaces, and an opt-in experimental context-management mode with token budgets and a new_context tool.
Why it matters
The new OpenAI flagship landed in the two most widely deployed coding-agent surfaces within a day of launch; persistent-notes context management (windows stay searchable instead of compressing into one summary) is the biggest architectural change to Codex CLI this quarter.
Importance: 3/5
Frontier flagship rollout across Copilot and Codex plus notable Codex CLI feature drop