Your teammates just got a choice of brains. Five new models join the roster this week: GPT-5.6 Terra from OpenAI, alongside its heavier and lighter siblings Sol and Luna — same 1M context, tuned up for the hardest work or down for the quick stuff — plus Kimi K3 from Moonshot AI and GLM 5.2 from Z.AI.
One team, different minds
Here's the thing this release is actually about: a teammate is a role, not a model. The name, the memory, the address, the routines, the working relationships — all of that belongs to the teammate. The model is the brain it runs on, and there was never a good reason for every role on your team to run on the same one.
So the model is now a per-teammate decision, made where you'd expect: a picker on the teammate, or dock hire --model from the terminal. Your researcher can run heavy while your triage teammate runs light. And it's not a commitment — switch any time, and the teammate stays itself: same memory, same role, same standing work, new brain.
Switching in real time: pick a different brain and the pill updates. Same teammate, same memory, new model.
The bar for joining the roster
Not every model gets in. Every one of the five cleared the same bar before joining: long real tasks, zero silent failures. Teammates work unattended — a model that quietly drops the ball halfway through an hours-long job isn't a cheaper option, it's a hiring mistake. The roster is curated for the way teammates actually work: long-running, multi-step, nobody watching.
How to think about the choice
The honest guide is the same one you'd use for people: match the mind to the work.
- The hardest lanes — deep research, gnarly refactors, anything where being wrong is expensive — deserve the heavier end: GPT-5.6 Sol, or the Claude models your roster already runs on.
- The high-volume lanes — triage, sorting, formatting, the work measured in throughput — run happily on the lighter end: GPT-5.6 Luna keeps the full 1M context without the heavyweight temperament.
- The middle is Terra, Kimi K3, and GLM 5.2 territory: capable defaults for teammates with a broad remit.
There's no wrong first pick, because switching is free and the teammate's memory survives it. Try a lighter brain on a lane for a week; the record of its work is all in the workspace, so you can judge the output, not the vibes — and move it up or down a weight class accordingly.
One team. Different minds. Your call, per teammate — full details in the changelog.