Key features
- GPT-5.6 Luna as the Free and Go chat default, plus a Think button (still Luna)
- GPT-5.6 Sol on paid chat with a reasoning slider (Instant, Medium, High, Extra High)
- GPT-5.6 Sol Pro on Pro (and Enterprise) for the hardest / longest jobs
Pros
- Free and Go now run a current-generation model (advanced Luna), not a leftover model
- Unlimited everyday text on Free/Go (abuse guardrails). Think is there if the question is hard
Cons
- Free and Go never get the advanced Sol in standard chat. Think is still Luna, not Sol
- The current rivals are advanced models. Older models are leftover API SKUs
