OpenAI announces GPT-5.6 Sol, Terra and Luna — Alex Getman

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Alex Getman @alexgetmancom · 26 Jun 2026, 18:41 UTC

OpenAI announced GPT-5.6 Sol, Terra, and Luna

Sol — the new flagship model for complex agentic workflows
GPT-5.6 introduces max reasoning and ultra modes with subagents
Key focus areas include coding, biology, and cybersecurity
Access is currently limited following a request from the U.S. government
Pricing ranges from $1/M input tokens to $30/M output tokens
In July, Sol will launch on Cerebras at up to 750 tokens/sec

Infographic from OpenAI showing three models: Sol (Sun, flagship for ambitious agentic work, $5/$30 per million tokens), Terra (Earth, balanced model, $2.50/$15), and Luna (Moon, fast, affordable, $1/$6) against a space background.

Bar chart TerminalBench 2.1 showing GPT-5.6 Sol Ultra (91.9%) and GPT-5.6 Sol (88.8%) leading in score among other models like Claude, GPT-5.5, and Gemini.

ExploitBench line graph showing GPT-5.6 Sol (dark blue line) achieving the highest Cap percent as output tokens increase, outperforming Terra, Luna, and previous GPT versions.

GPT-5.6 Sol OpenAI GPT

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