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OpenAI to Publicly Launch GPT-5.6 Sol, Terra and Luna Thursday

July 8, 2026 at 00:00 EDT

Foundation Models
AI Agents

OpenAI said it will publicly launch GPT-5.6 Sol, its flagship model, alongside the everyday-workload Terra and the lightweight, fast Luna this Thursday, while expanding access to its preview globally.

July 10, 2026 · OpenAI

GPT-5.6 Goes Public: Sol, Terra & Luna

OpenAI moves from a government-reviewed limited preview to a global launch of a three-tier model family — a flagship, a cost-efficient workhorse, and a low-cost high-volume tier — with the same tiers priced 5× apart.

Three tiers, one generation

Output pricing per 1M tokens — the low tier costs one-fifth of the flagship.

$30

Sol

Flagship · in $5

$15

Terra

Efficient · in $2.50

Luna

Low-cost · in $1

750

tokens/sec peak on a Cerebras high-speed deployment

~⅓

of the output tokens used on ExploitBench vs. rivals it matched

30 min

minimum prompt cache lifetime with explicit breakpoints

Terminal-Bench 2.1 — agentic coding

Command-line coding accuracy across the family (Sol Ultra uses sub-agents).

Sol Ultra91.9%

Sol88.8%

Luna84.3%

Terra82.5%

A government-reviewed, staged rollout

JUN 26

Limited preview for trusted partners

→

SAFETY REVIEW

Cybersecurity & frontier-model checks at U.S. gov request

→

JUL 10

Public launch + global preview expansion

What partners praise

Strong agentic coding gains
Luna's cost-performance, Terra's efficiency
Promise in biology & cyber domains

Open questions

Independent benchmark verification wanted
Sub-agent reliability still debated
Dual-use requests face delays or blocks

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