Code & Chain · Signal Desk

OpenAI Codex 0.161 Switches Default to GPT-6.1 Sol, Allows MCP Server Login in Terminal

2026-10-09AIToolingLast updated: 8 Oct 2026, 11:35 pm UTC
Original sourceReveneau

Summary

OpenAI Codex version 0.161 sets GPT-6.1 Sol as the default model in the built-in and Amazon Bedrock catalogs, using Sol unless the configuration file explicitly specifies Astra. New features include an OAuth flow via /mcp login within the terminal interface, allowing users to log into MCP servers w…

Key points

  • Directly impacts the cost structure and MCP workflow setup of development teams using Codex, a practical update that allows immediate configuration adjustments.
  • The default model switch and terminal MCP login lower the barrier and cost of using agent tools, directly changing developers' daily operations.
  • Teams that do not lock in Astra will automatically switch to the lower-cost Sol, potentially reducing inference spending; meanwhile, GovCloud support opens space for Codex in public sector and regulated industries.
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