Jul 9, 2026, 7:46 PM

The new GPT-5.6 family: Luna, Terra, Sol

TickrWire Editorial Desk·Jul 9, 2026, 7:46 PM·1 min read AI-assisted, human-reviewed

Reported by Simon Willison: The new GPT-5.6 family: Luna, Terra, Sol. Analysis and context written by TickrWire.

30-second summary

<p>OpenAI's latest flagship model <a href="https://openai.com/index/gpt-5-6/">hit general availability this morning</a>, and comes in three sizes: Luna, Terra, and Sol (from smallest to largest).</p> <p>The new models are priced per 1M input/output tokens as Luna $1/$6, Terra $2.50/$15, Sol $5/$30. For comparison, the Claude Opus series are $5/$25 and the Claude Fable 5 is $10/$50, but price-per-million tokens doesn't tell us much now that the number of reasoning tokens can differ so much between models for the same task.</p> <p>All three models have a February 16th 2026 knowledge cut

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The new GPT-5.6 family: Luna, Terra, Sol
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<p>OpenAI's latest flagship model <a href="https://openai.com/index/gpt-5-6/">hit general availability this morning</a>, and comes in three sizes: Luna, Terra, and Sol (from smallest to largest).</p>

<p>The new models are priced per 1M input/output tokens as Luna $1/$6, Terra $2.50/$15, Sol $5/$30. For comparison, the Claude Opus series are $5/$25 and the Claude Fable 5 is $10/$50, but price-per-million tokens doesn't tell us much now that the number of reasoning tokens can differ so much between models for the same task.</p>

<p>All three models have a February 16th 2026 knowledge cut

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