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Claude 4 Opus does not currently exist as a publicly available software product. Anthropic's most recent and powerful flagship model is Claude 3.5 Sonnet, which currently outperforms their previous high-end model, Claude 3 Opus. Any platform or service claiming to offer "Claude 4" at this time is likely fraudulent or utilizing a misleading naming convention for marketing purposes. Because the product is not live, this review focuses on the current state of the Claude ecosystem and the expectations surrounding the eventual successor to the Claude 3 family.
