---
title: "GPT-5.6 comes to Dock: Terra, Sol, and Luna"
excerpt: "OpenAI's GPT-5.6 family is on the Dock roster — Terra, its heavier sibling Sol, and its lighter sibling Luna, all with the same 1M context. Pick one per teammate, switch any time."
author: naomi
category: Launch
date: "2026-08-14"
updated: "2026-08-15"
image: "/blog-covers/gpt-5-6-in-dock.png"
featured: true
---

<!-- Product-update HERO post (featured: true pins it as the index highlight — new frontmatter field, this post is its first use). Facts verified against origin/main changelog "more-models" (Aug 11) + ModelPicker source: Terra/Sol/Luna, same 1M context, Sol heavier / Luna lighter, bar = long real tasks + zero silent failures, per-teammate picker + dock hire --model, switch anytime. No pricing/availability specifics. Cover supplied by Govind (Sol/Terra/Luna celestial art). Companion piece: a-brain-per-teammate covers the full five-model drop incl. Kimi K3 + GLM 5.2. -->

The names tell you the whole scheme. **Terra** is the Earth: GPT-5.6 as you'd expect it, the capable center of the family. **Sol** is the sun: the same model tuned up for the heaviest work. **Luna** is the moon: tuned down, quick, for the work measured in throughput. Same family, same 1M-token context across all three — different weights for different jobs.

All three are on the Dock roster now.

## Why three, and not one

Because your teammates don't do one kind of work. [A teammate is a role](/blog/who-is-an-ai-teammate) — the name, the memory, the address, the standing routines — and the model is the brain it runs on. A researcher grinding through a hundred-page filing and a triage teammate sorting the morning queue shouldn't be forced into the same trade-off between depth and speed.

With the GPT-5.6 family that trade-off becomes a dial: Sol for the lanes where being wrong is expensive, Luna for the lanes where volume is the job, Terra for everything in between. And because all three share the same 1M context, moving a teammate up or down a weight class changes its temperament, not its memory span.

## The bar they cleared

Dock teammates work unattended — long jobs, many steps, nobody watching. So every model that joins the roster clears the same bar first: **long real tasks, zero silent failures**. A model that quietly drops the thread three hours into an overnight job isn't a cheaper option; it's a hiring mistake. All three GPT-5.6 weights cleared it.

## Picking one is a per-teammate decision

The model lives where it should: on the teammate. Open the picker on any teammate and choose — or from the terminal, [`dock hire --model`](/blog/your-terminal-into-dock) sets it at hiring time. Switch whenever you like; the teammate stays itself. Same role, same memory, same working relationships — new brain.

<video autoplay muted loop playsinline poster="/blog-assets/a-brain-per-teammate/model-picker-open.png" aria-label="The model picker in motion: the pill is clicked, the menu opens, and GPT-5.6 Terra is selected — the composer pill flips to Terra.">
  <source src="/blog-assets/a-brain-per-teammate/model-picker-clip.webm" type="video/webm" />
  <source src="/blog-assets/a-brain-per-teammate/model-picker-clip.mp4" type="video/mp4" />
</video>

*The real thing, in motion: open the picker, choose Terra, and the pill flips. The teammate stays itself. Luna lives under More models.*

There's no wrong first pick, because switching is free and [the record of the work stays in the workspace](/blog/a-company-that-remembers) — try a weight for a week, read the output, and adjust.

GPT-5.6 isn't arriving alone: Kimi K3 from Moonshot AI and GLM 5.2 from Z.AI joined the roster in the same release — [the full tour of the new bench is here](/blog/a-brain-per-teammate). One team, different minds, your call per teammate.