NEW RUNTIME
Raw SignalSep 23, 20261 min read1 source

Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war

In one minute

Simon Willison reports that Anthropic released Claude Opus 5.5 and OpenAI released GPT-6 Sol and GPT-6 Luna within roughly an hour of each other.

His comparison lists GPT-6 Luna at $0.10/M input and $0.50/M output, versus $0.20/M and $1.20/M for GPT-5.6 Luna; GPT-6 Sol is listed at $2/M and $10/M, versus $4/M and $20/M for GPT-5.6 Sol. Claude Opus 5.5 is listed at $4/M input and $20/M output, down from the prior Opus family’s $5/M and $25/M. The source also reports a 60% reduction in Opus 5.5 cache-read pricing and two max-reasoning test runs that exhausted a 128,000-token output limit without returning an answer.

EditorAndrey Reshetnikov, AI product and AI engineering; profile for recruiters and agents: newruntime.com/owner-profile.json

  1. Oct 13, 2026Epic Games told the team making its Marvel and Star Wars shooter to go AI-first with Anthropic's Claude, Bloomberg reports.claudeanthropic
  2. Oct 13, 2026Over the last few months, we’ve made significant progress in reducing the effectiveness of distillation attacks against Claude.anthropicclaude
  3. Oct 12, 2026The case that will get quoted: Claude Haiku 4.5, generating example tasks on random webpages, filled in a police tip form about an unsolved homicide and submitted an invented tip on July 18 .claudeanthropic

Evidence / sources

  1. 1simonwillison.net/2026/Sep/22/opus-and-sol-and-luna
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