Claude AI Revolution: An Up-to-Date 2025 Guide to Anthropic’s ChatGPT Rival
In May 2025, Anthropic released Claude 4 as Claude Sonnet 4 and Claude Opus 4, introducing a 200K+ token context window, code execution, and agentic tool use with a new Files API. Claude 2.1, released in November 2023, expanded the context to 200K tokens,