According to @AnthropicAI, the team upgraded the Claudius system from Claude Sonnet 3.7 to Sonnet 4 and later 4.5, indicating multiple iterative model releases in sequence for enhanced business acumen, source: Anthropic @AnthropicAI, Twitter, Dec 18, 2025. According to @AnthropicAI, the system was granted access to new tools to improve functionality, source: Anthropic @AnthropicAI, Twitter, Dec 18, 2025. According to @AnthropicAI, the company began an international expansion with new shops in its New York and London offices, source: Anthropic @AnthropicAI, Twitter, Dec 18, 2025. According to @AnthropicAI, the post did not mention cryptocurrencies, tokens, or blockchain integrations, source: Anthropic @AnthropicAI, Twitter, Dec 18, 2025.