Fable 5 AgentNo sign-inAuthenticated async Fable 5 Agent agent with status polling and artifact results.GPT-5.6-luna AgentNo sign-inAuthenticated async GPT-5.6-luna Agent agent with status polling and artifact results.GPT-5.6-sol AgentNo sign-inAuthenticated async GPT-5.6-sol Agent agent with status polling and artifact results.Opus 4.8 AgentNo sign-inAuthenticated async Opus 4.8 Agent agent with status polling and artifact results.Sonnet 5 AgentNo sign-inAuthenticated async Sonnet 5 Agent agent with status polling and artifact results.