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Simon Willison Breaks Down the GPT-5.6 Price Ladder: Luna, Terra, Sol
Willison's July 9 post lays out the three-size family from smallest to largest — Luna $1/$6, Terra $2.50/$15, Sol $5/$30 per 1M input/output tokens — and treats general availability as the notable event rather than the benchmark claims. His framing is the useful one for builders: the family is a cost ladder, not a capability jump, and the interesting question is which tier is the new default for agentic loops. Worth reading alongside his same-day llm 0.31.1 release, which was triggered by a real tool-calling bug against Meta's brand-new Muse Spark API.
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