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Zeitgeist — a spike by Chris Gathercole
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  2. Simon Willison — Creator of Datasette; co-creator of Django/

Advancing the price-performance frontier with GPT‑5.6

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  • OpenAI cut GPT-5.6 Terra pricing 20% and GPT-5.6 Luna pricing 80%; Luna now runs $0.20/M input, $1.20/M output — a fifth the cost of Claude Haiku 4.5 ($1/$5), positioned against Google’s Gemini 3.1 Flash-Lite ($0.025/$1.50).
  • OpenAI credits its internal model GPT-5.6 Sol for the infrastructure optimization behind the cut — used it to rewrite inference kernels in Triton and Gluon (GPU programming languages), cutting serving costs 20% by eliminating GPU idle time.
  • Willison switched his agent.datasette.io demo from Gemini to Luna as a direct result of the price change.
  • Takeaway: frontier labs are now using their own models to optimize the infrastructure that serves them, compounding cost reductions beyond training-side gains alone.