Found this announcement interesting since allegedly OpenAI is retiring their Terra tier. I think for everyday work, two models with various thinking efforts seem enough, plus some frontier level model like Fable or Astra to coordinate.
Retiring the Terra tier? Their space-inspired lineup has only been out for 2 months, they're already messing with it?
I personally use up to 3 models. Fable/Opus for planning, Opus/Sonnet for implementation depending on complexity.
I would maybe use Haiku 5.5 for highly parallel workflows like checking in on MRs or scanning my entire codebase.
Terra lost to Sol and Luna at every cost/performance point, it had no reason to exist.