00:00 Seed S-unavail
00:28 Settings > General > New threads > Model. Row: "GPT-6-Astra · Medium"
00:30 settings.json defaultModelSelection = {"instanceId":"claudeAgent","model":"claude-opus-4-8","options":[{"id":"effort","value":"high"}]}
00:33 Open the effort picker (currently "Medium")
00:36 Choose Low
00:40 Picked Low. settings.json now {"instanceId":"codex","model":"gpt-6-astra","options":[{"id":"reasoningEffort","value":"low"},{"id":"serviceTier","value":"default"}]}
00:42 Reload the page
00:58 After reload. Row: "GPT-6-Astra · Low"
01:00 jq .defaultModelSelection settings.json -> {"instanceId":"codex","model":"gpt-6-astra","options":[{"id":"reasoningEffort","value":"low"},{"id":"serviceTier","value":"default"}]}