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§ models · storyline

Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna released

Anthropic releases Claude Opus 5.5 and OpenAI releases GPT-6 Sol and GPT-6 Luna.

today · · primary fetch12 sourcesupdated today ·

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/...

read full article on bsky.app ↗
§ sources14 publications · timeline below
  1. bsky.appBig 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/…primary
  2. Google News — AIGPT-6 Sol vs Claude Opus 5.5 Head-to-Head: Who Wins the "King of Cost-Effectiveness" Title on the Same Day - 36Kr
  3. AnthropicIntroducing Claude Opus 5.5
  4. SiliconANGLEAnthropic releases Claude Opus 5.5 and OpenAI counters with two cheaper GPT-6 models
  5. GizmodoOpenAI Releases New GPT-6 Sol and Luna Models, Sells Them as Mini-Astras
  6. MacRumorsOpenAI's New GPT-6 Sol and Luna Models Bring Astra Improvements to Cheaper Tiers
  7. Yahoo FinanceOpenAI Introduces GPT-6 Sol And Luna, Slashing API Prices 50% To Bring Advanced AI To More Users
  8. NewsCordOpenAI Launches GPT-6 Sol And GPT-6 Luna With Half-Price API Costs: 11 outlets compared
  9. Google News — AIClaude Opus 5.5 and OpenAI GPT-6 Sol & Luna both launch today with lower costs - 9to5google.com
  10. Google News — AIOpenAI's GPT-6 Sol and Luna cut prices in half but barely move the needle on performance - the-decoder.com
  11. Constellation ResearchOpenAI adds GPT-6 Luna and Sol, touts lower prices
  12. The Next WebOpenAI cuts GPT-6 prices in half with Sol and Luna
  13. Microsoft AzureGPT-6 Astra, Sol, and Luna: For production agents in Microsoft Foundry
  14. CNBCAnthropic and OpenAI roll out cheaper models in first release since call for slowdown

§ how this story moved

  1. primary — CNBC publishes the launch post.
  2. Microsoft Azure picks up coverage.
  3. The Next Web picks up coverage.
  4. Constellation Research picks up coverage.
  5. Google News — AI picks up coverage.
  6. Google News — AI picks up coverage.
  7. NewsCord picks up coverage.
  8. Yahoo Finance picks up coverage.
  9. MacRumors picks up coverage.
  10. Gizmodo picks up coverage.
  11. SiliconANGLE picks up coverage.
  12. Anthropic picks up coverage.
  13. Bluesky — Simon Willison picks up coverage.
  14. Google News — AI picks up coverage.