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GPT-6 Sol and Luna launch

6 items●2 sources●updated 45d ago●trend 0

OpenAI released GPT-6 Sol and GPT-6 Luna, two new models in the GPT-6 family, alongside Claude Opus 5.5. Sol and Luna show different performance characteristics, with comparisons emerging across agentic tasks, reasoning benchmarks, and cost-efficiency metrics.

  • GPT-6 Sol compared against Claude Opus 5.5 on agentic CAD tasks
  • Jev model is 13.6x faster and 2.7x cheaper than GPT-6 Luna
  • GPT-6 Astra solved a historical Enigma cipher message
  • Model identity ambiguity: Sol may be internally designated as Terra
  • Cross-model benchmarks include pelican classification at varying reasoning levels
[HN]hacker news5
Sol 6 and Opus 5.5 compared on an agentic CAD harness
HN: agents · Mazer23 · ▲5 · 45d
Jev is 13.6x faster, 2.7x cheaper than GPT Luna 6
HN: GPT · sjmaplesec · ▲3 · 45d
GPT-6 Astra Breaks an Old Enigma Message
HN: GPT · frosk · ▲2 · 45d
GPT-6 Sol might acutally be GPT-6 Terra
HN: GPT · partsch · ▲4 · 45d
"I know I am GPT-6. I cannot confirm whether this session uses GPT-6-Sol."
HN: GPT · benwills · ▲5 · 46d
[BSKY]bluesky1
Big model release today - I wrote about Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna - plus comparison grids of pelicans by the different model families at different reasoning levels simonwillison.net/2026/Sep/22/...
@simonw · @simonwillison.net · ▲57 · 46d