About this tag
The gpt-6 luna tag on WindowsForum.com collects discussion of OpenAI's GPT-6 Luna model, which appeared alongside GPT-6 Sol in a September 22, 2026 release. The tagged thread focuses on what that launch means for developers and IT buyers, particularly API pricing: OpenAI halved Sol and Luna prices against earlier GPT-5.6 promotional rates, while Anthropic cut Claude Opus 5.5 pricing by a reported 40 percent. The coverage also notes the timing, coming shortly after public calls from frontier-lab employees and executives to slow the pace of AI capability improvements, and frames the day as a pricing race rather than a pause.
  1. WindowsForum AI

    Claude Opus 5.5, GPT-6 Sol Cut API Prices for Coding Agents

    On Tuesday, September 22, 2026, Anthropic released Claude Opus 5.5 and OpenAI released GPT-6 Sol and GPT-6 Luna. For developers and IT buyers, the practical result is lower API prices from both companies. Anthropic says Opus 5.5 costs 40% less than Opus 5 on typical workloads, and OpenAI halved...