October 10, 2026 · 6 min read
Codex CLI now defaults to GPT-6.1 Sol: what changes for your agent setup
Codex CLI 0.159.1 made GPT-6.1 Sol the default model, and 0.161.0 kept it. What the switch changes for an agent setup, what Sol costs ($2 in, $10 out, $0.1 cached per million tokens), the release-note changes worth knowing, and what is still unknown.



