GPT-6.1 Sol is in Codex. Test it against Astra on your own task before you switch

Thu, 08 Oct 2026 07:03:00 +0000

OpenAI added GPT-6.1 Sol to Codex on September 29, and Codex CLI 0.161.0 (October 7) makes it the default model in the bundled catalog, according to the Codex changelog . The pitch: near-Astra performance for complex work, at lower cost than Astra. That’s a claim about OpenAI’s tasks. Whether it holds on your codebase is a ten-minute experiment, and OpenAI’s own model selection guide tells you to run it: compare the models on the same task and keep the lightest setting that meets your quality bar.

Model-Selection on Tokenise

GPT-6.1 Sol is in Codex. Test it against Astra on your own task before you switch