Anthropic and OpenAI Launch Opus 5.5 and GPT-6 Sol on the Same Day

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On September 22, 2026, Anthropic released Claude Opus 5.5 and OpenAI followed roughly 90 minutes later with GPT-6 Sol and a smaller companion model called Luna, marking an unplanned same-day launch from two leading AI companies. Independent benchmarks from Artificial Analysis showed Opus 5.5 outperforming GPT-6 Sol on quality metrics, including Terminal-Bench 4.0 scores of 52.5% versus 43.9%. However, GPT-6 Sol offered a significantly lower price point, with one developer analysis estimating it to be approximately 47% cheaper than Anthropic's offering. The two companies used different testing conditions in their official announcements, making direct comparisons difficult and highlighting the lack of a shared industry benchmark standard. Analysts note that the competitive focus in 2026 has shifted from raw capability to performance per dollar, with both firms emphasizing real-world task outcomes over leaderboard scores.

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