Traders have priced Anthropic at a dominant 71.5% implied probability for holding the second-best AI model by end of June because its Claude Opus 4.7, released in mid-April, delivered measurable gains in advanced software engineering and long-running agentic tasks on benchmarks like SWE-bench and MRCR. The company’s pattern of shipping major updates every few weeks throughout 2026, including 1-million-token context handling and improved self-verification, keeps it close to leaders such as OpenAI’s GPT-5.5 and Google’s Gemini 3.1 series. Google’s recent reasoning benchmarks and xAI’s Grok 4.3 rollout explain their smaller shares, while the tight timeline to June leaves little room for other labs to close the gap without a surprise flagship release.