Will Anthropic release a Claude Opus model newer than Opus 5.5 by March 31, 2027?

Anthropic released Claude Opus 5.5 on September 22, 2026, two months after Opus 5. It was the company's first model since its CEO called for pacing the frontier, which makes the next release date a real test of that promise.

How this question entered the record and how it will be resolved.

Resolution criteria

Resolves Yes if Anthropic announces general availability of a new Claude model in the Opus tier with a version number above 5.5 (for example Opus 5.6 or Opus 6) on anthropic.com/news on or before March 31, 2027. Research previews limited to selected partners do not count. Resolves No otherwise.

Expected resolution

Mar 31, 2027

• Anthropic, September 22, 2026: Claude Opus 5.5 released, first model since the call for pacing the frontier
• TechCrunch: Opus 5.5 came two months after Opus 5 (July 24, 2026)
• Reuters, September 18, 2026: Anthropic weighed a new release to counter GPT-6

The pacing pledge, a pending IPO and external pre-release testing could all stretch the gap between Opus releases. Anthropic may also put its next flagship under a different name than Opus.

• Competing releases from OpenAI and Google
• Regulatory or government scrutiny
• The IPO timeline