[November 2025] mitsumonoAI Update Information [Part 2] | Latest AI Models Added

Update Details

✅ Launch of Claude 4.5 Opus

We have integrated Anthropic's top-tier model, "Claude 4.5 Opus," as well as "Claude 4.5 Opus Thinking," which features a newly enhanced thought process, into mitsumonoAI.

• Claude Opus 4.5
• Claude Opus 4.5 Thinking

Compared to previous models, consistency in long-form text generation and knowledge levels in specialized fields have dramatically improved. The "Thinking" model, in particular, allocates time for internal deep reasoning (Chain of Thought) before outputting a response. It examines complex instructions from multiple angles, much like a human expert, to derive an answer.

Use Cases

• Claude Opus 4.5: Scenarios requiring high expressiveness, such as creating high-quality articles that reflect a company's brand voice, creative writing for novels and scripts, and customer support replies that capture subtle emotional nuances.
• Claude Opus 4.5 Thinking: Complex tasks where logical consistency and safety are paramount, such as investigating the causes of unknown bugs and proposing fix codes, identifying complex legal risks, and creating requirement definition documents for large-scale projects.

✅ Launch of Grok 4.1 Series

We have added "Grok 4.1-fast-reasoning" and "Grok 4.1-fast-non-reasoning" from xAI's latest AI models to mitsumonoAI, specializing in speed and cost performance.

• Grok 4.1-fast-reasoning
• Grok 4.1-fast-non-reasoning

Leveraging the power of "Colossus," one of the world's largest computing clusters, it achieves response speeds that overwhelm competitor models. The defining feature is the ability to choose whether or not to use "Reasoning" depending on the application, delivering the strongest performance in processing real-time information.

Use Cases

• Grok 4.1-fast-reasoning: Scenarios requiring both "speed" and "logical accuracy," such as market sentiment analysis based on real-time posts on X (formerly Twitter), fact-checking and background context for breaking news, and instant summarization of live stream content.
• Grok 4.1-fast-non-reasoning: Scenarios where "intuitive responses" and "overwhelming speed" are prioritized over deep reasoning, such as immediate chatbot responses (low latency), real-time multilingual translation, simple organization of large volumes of unstructured data, and brainstorming sessions.

*Please refer to this manual for the features of each AI model.

AI Model

mitsumonoAI offers not only access to large language models like ChatGPT and Claude, but also includes a specialized model called Sensei AI, designed for industry-specific insights. This page explains the basic usage of AI Chat and key tips for getting the most out of it.