00:00 Seed S-off
00:31 Settings > General > New threads > Model. Row: "GPT-6-Astra · Medium"
00:34 settings.json defaultModelSelection = {"instanceId":"claudeAgent","model":"claude-opus-4-8","options":[{"id":"effort","value":"high"}]}
00:37 Open the effort picker (currently "Medium")
00:40 Choose Low
00:44 Picked Low. settings.json now {"instanceId":"codex","model":"gpt-6-astra","options":[{"id":"reasoningEffort","value":"low"},{"id":"serviceTier","value":"default"}]}
00:47 Reload the page
00:57 After reload. Row: "GPT-6-Astra · Low"
00:59 jq .defaultModelSelection settings.json -> {"instanceId":"codex","model":"gpt-6-astra","options":[{"id":"reasoningEffort","value":"low"},{"id":"serviceTier","value":"default"}]}