GPT-5.6 Sol: OpenAI's Three-Tier Bet on Frontier Models
OpenAI previewed GPT-5.6 Sol along with Terra and Luna versions, according to the company's official announcement. The three names map a clear hierarchy, signaling a formal move toward a flagship, mid-tier, and cheaper model lineup rather than ad hoc suffixes. It's the clearest sign yet that tiered pricing and capability structures are becoming the default shape of frontier AI, not an exception. For PMs, it means the model your product depends on today may soon have two siblings worth evaluating, and your integration layer needs to be ready before pricing and availability are even confirmed.