reasoning
Reflection Beam: 501B open-weight model, weights later in October 2026
Reflection Beam is a 501B sparse MoE with 23B active parameters for coding and agent tasks; Reflection plans Apache 2.0 weights later in October 2026.
GPT-5.6 Sol, Terra, and Luna: which tier to use for agent work
Use Sol for multi-agent reasoning and long context, Terra as the default for coding at 40% of the cost, and Luna only for short, high-volume tasks.