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OpenAI Opens GPT-5.6 Sol, Terra and Luna to Everyone

July 9, 2026 at 13:09 EDT

Foundation Models
AI Agents
Software Dev & Coding

On July 9, 2026, OpenAI began the global rollout of its GPT-5.6 series (Sol, Terra and Luna), alongside the enterprise-focused "ChatGPT Work," a revamped "ChatGPT desktop app," and "Hosted sites" for publishing generated output.

July 9, 2026 · OpenAI

GPT-5.6 Goes Global: Sol, Terra & Luna

OpenAI rolls out a three-tier GPT-5.6 series — flagship Sol, balanced Terra, fast-and-cheap Luna — plus ChatGPT Work, a new desktop app and Hosted sites, after a government-requested limited preview.

1.5M

token context window (+43% vs GPT-5.5)

90%

discount on cached-prompt reads

750

tokens/sec for Sol on Cerebras

Terminal-Bench 2.1 — agentic coding

Higher is better · scored 0–100%

91.9%

Sol Ultra

88.8%

Sol

88.0%

Claude Mythos 5

84.3%

Terra

82.5%

Luna

GPT-5.6 SOL — flagship

$5 in / $30 out

per 1M tokens · Ultra mode runs parallel sub-agents

GPT-5.6 TERRA — balanced

$2.50 in / $15 out

per 1M tokens · GPT-5.5 performance at ~half the price

GPT-5.6 LUNA — fast & cheap

$1 in / $6 out

per 1M tokens · built for high-volume tasks

What early users praise

Sol excels at long-running autonomous work and sub-agent coordination
Strong at surfacing edge cases and bugs
Terra is "fast, cheap and very capable" for daily tasks

Where it draws criticism

Heavy token consumption
Tendency toward overly technical phrasing
Can trail Fable 5 on writing and design — pair with rivals as needed

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