AIチャットボット

Claude is an AI assistant made by Anthropic, first released in March 2023. Known for long context windows (up to 200K tokens), strong reasoning, and a focus on helpful, harmless, and honest responses. Available via web chat (claude.ai) and API. Free tier, Pro at $20/month, Max at $100+/month.

Gemini is Google's AI assistant (formerly Bard), rebranded in February 2024. Deeply integrated with Google services (Gmail, Drive, YouTube), featuring multimodal input (text, image, video, audio). Free tier with Gemini Flash, Gemini Advanced at $19.99/month.

ChatGPT is a conversational AI assistant developed by OpenAI, launched in November 2022. It uses large language models (currently GPT-4o, GPT-4.1, and o-series reasoning models) to answer questions, write content, analyze data, and perform various tasks. Free tier available; ChatGPT Plus at $20/month and Pro at $200/month.