Thorough Explanation of GPT 5.1, GPT-5.1 Thinking & Gemini 3 Pro | Performance, Usage, and Comparison of OpenAI / Google's Latest AI Models
This article focuses on the latest AI models—OpenAI's GPT 5.1 and GPT-5.1 Thinking, and Google's Gemini 3 Pro—providing a thorough explanation of their overwhelming performance and specific methods for accelerating business with them.
mitsumonoAI implemented an update in November 2025, including the addition of new AI models:
- GPT 5.1
- GPT-5.1 Thinking
- Gemini 3 Pro
GPT 5.1: Evolving Intelligence and Conversationality Challenge Untapped Issues
What is GPT 5.1?
GPT 5.1 is an improved version of the GPT-5 AI model, announced by OpenAI on November 12, 2025 (US time).
It possesses multimodal capabilities (integrated understanding of text, images, audio, and video) and long-context comprehension that far surpass the previous generation, accurately understanding extremely complex instructions and abstract concepts.
OpenAI explains that the update to GPT-5.1 focuses not only on "intelligence" but also on ease of conversation.
Key Characteristics of GPT 5.1
- Further Improvement in Overwhelming Reasoning Ability and Long-Text Comprehension/Generation: GPT 5.1 excels in accurately understanding complex logical structures and nuances based on knowledge learned from massive datasets, and in generating coherent, ultra-long texts.
- Deepening of Contextual Understanding: It deeply understands dialogue across multiple turns and the context throughout ultra-long documents, providing appropriate responses and generating text consistent with the context.
- Adaptability to Complex Instructions: It accurately grasps the intent of even extremely complex instructions, including multiple conditions and constraints, and outputs the expected results.
- Further Enhancement of Ethics and Safety: Utmost care has been taken regarding the model's safety and ethical aspects, strengthening mechanisms to suppress the generation of inappropriate or harmful content.
- Advanced Multimodal Support: It simultaneously and deeply understands text, images, audio, and video, deriving new insights from their interrelationships.
- Multiple Tone Presets: Multiple tone presets have been added to ChatGPT, making it easier for users and organizations to select a more suitable way of speaking.
Suitable Applications for GPT 5.1
- Ultra-Advanced Research and Analysis: Predicting market trends across multiple industries, reviewing massive academic papers, building complex financial models, and analyzing trends from large-scale datasets.
- Innovative Planning and Strategy Formulation: Building business models for new ventures, devising marketing strategies that exploit competitor weaknesses, optimizing supply chains, and fostering innovation based on future predictions.
- Creation of Top-Tier Professional Content: Drafting detailed technical specifications, white papers, legal documents, assisting in writing highly specialized books, and managing large-scale content projects.
- Cutting-Edge Programming Assistance: Designing architecture for large-scale systems, identifying and fixing unknown bugs, refactoring code across multiple languages, and exploring new programming paradigms.
Specific Use Cases for GPT 5.1
- Example 1: Multifaceted Future Prediction of the Global Market
Example 2: Application Possibilities of New Technology and Creation of a Business Model
Furthermore, it carries an extremely low risk of allergic reactions compared to conventional biomaterials, and its degradability can be controlled. Based on the characteristics of this new Material X, broadly explore untapped application possibilities in the medical field and propose detailed, specific business models for each application.
Please cover the following points: (Omitted) In this brainstorming session, we seek multifaceted and highly feasible ideas that maximize the potential of the new material and lead to innovation and sustainable business creation in the medical field. Deeply understand the long instructions and complex requirements, and present the analysis results and business models through a systematic and creative thinking process."
Evaluation of Generated Results
GPT-5.1 proposed 10 new business ideas spanning a wide range of global market trends, specifically indicating targets and differentiators. For the new material's medical applications, it detailed products, revenue models, and customers in five fields. Both responses provided highly useful information for deeply considering new businesses from a multifaceted, forward-looking perspective.
GPT-5.1 Thinking: Solving Complex Challenges with Deep Insight and Multi-Step Reasoning
What is GPT-5.1 Thinking?
GPT-5.1 Thinking is a model built upon the overwhelming intelligence of GPT 5.1, but specifically optimized for extremely complex tasks that require multi-step reasoning processes and deep insight. It does not stop at superficial information, but identifies the root cause of a problem and structurally derives solutions, thereby supporting advanced decision-making.
Key Characteristics of GPT-5.1 Thinking
- Multi-Step Reasoning and Adaptive Reasoning: It logically thinks through multiple steps, breaking down and reconstructing complex problems to derive systematic solutions. It also features "Adaptive Reasoning," where the AI self-assesses the complexity of the user's question and allocates additional thinking time (computational resources) before responding to more challenging queries.
- Deep Insight: It excels at identifying hidden correlations and causal relationships within large volumes of information, discovering new perspectives and essential issues.
- Complex Decision-Making Support: It analyzes multiple scenarios and evaluates potential risks and opportunities, clearly presenting the optimal choices and recommendations.
- Consistent Thinking in Ultra-Long Texts: It derives consistent conclusions and proposals without contradiction from the entirety of massive information, maintaining continuity of thought.
- Improved Efficiency and Clarity: The efficiency and clarity of responses are significantly improved, with fewer specialized terms or undefined words.
- More Empathetic Tone: The default tone has become warmer and more empathetic.
Suitable Applications for GPT-5.1 Thinking
GPT-5.1 Thinking demonstrates its true value in applications requiring deep analysis and structured problem-solving, such as:
- Strategic Consulting: Formulating management strategies, due diligence for M&A cases, optimizing business portfolios, and developing organizational transformation plans.
- Scientific Research and Hypothesis Testing Support: Analyzing complex experimental data, generating and testing new hypotheses, and reviewing extensive literature and evaluating prior research.
- Precise Document Analysis in Legal and Auditing Fields: Detailed risk assessment of contracts, extracting and interpreting specific clauses from large-scale regulatory documents, and deep analysis of audit reports.
- Risk Assessment and Improvement Proposals in Product Development: Identifying potential risks in new product market entry, pinpointing design issues and proposing multiple solutions, and deep analysis of user feedback.
Specific Use Cases for GPT-5.1 Thinking
- Example 1: Feasibility Assessment of a New Business
[Information for Evaluation]: Market Data: Japan's population aged 65 and over exceeds 36 million, with approximately 70% interested in home health management. (Omitted) Optimal Business Strategy and Specific Steps: Based on the above analysis, present the most promising business strategy and outline specific steps to be taken during the first three years of the business (key milestones, required resources, and a concept of responsible departments) in a roadmap format.
Through this brainstorming session, we expect to integrate diverse complex information and derive a highly feasible, innovative business model and strategy through logical and systematic thinking."
- Example 2: Product Design Change Proposal to Conform to Complex Regulatory Requirements
Evaluation of Generated Results
GPT-5.1 Thinking deeply and multi-facetedly analyzed difficult challenges, such as the SaaS business for the elderly and complex environmental compliance, covering user needs to technology, finance, and risk. It detailed the evaluation of multiple specific solutions and their impact, presenting realistic plans and optimal transition strategies. Its ability to think deeply through complex problems in stages and solve them methodically stands out.
Gemini 3 Pro: The Cutting-Edge Model for Multimodal and Large Context Capabilities
What is Gemini 3 Pro?
Gemini 3 Pro is part of the "Gemini 3" and "Gemini 3 Pro" AI models, announced by Google AI in November 2025 as Google's greatest masterpiece yet.
As Google CEO Sundar Pichai boasts, it is "the most scientific model yet, capable of realizing any idea." It features ultimate multimodal capabilities (surpassing Gemini 2.5 Pro) and an industry-leading ultra-large context window of up to 2 million tokens (equivalent to approximately 3,000 pages of documents).
Key Characteristics of Gemini 3 Pro
- Ultimate Multimodal Support (Seamless Integration of Text, Image, Audio, and Video): It simultaneously and deeply understands all information formats—text, image, audio, and video—deriving new insights from their interrelationships. It offers maximum support, such as uploading a picture of homework or transcribing notes from a recorded lecture you missed.
- Ultra-Large Context Window (Up to 2 Million Tokens): It can process 2 million tokens at once. It can read entire long reports, tens of thousands of lines of code, or several hours of video, enabling precise analysis and summarization based on a grasp of the entire context.
- Dramatically Improved Reasoning Ability and Large-Scale Data Processing: By combining large-scale data with ultimate multimodal capabilities, it integrates multiple information sources to present multifaceted solutions to complex problems. Gemini 3 has achieved revolutionary evolution in Reasoning, Agent capabilities, and Multimodality.
- Precise Code Comprehension and Generation Capabilities: It is expected to assist programming by understanding entire large codebases, detecting vulnerabilities, optimizing code, and even designing complex system architectures or generating advanced code across multiple languages. It can output deliverables that are complete in a single shot, such as generating SVGs, LPs, slides, games, and simulations.
- Overwhelming Performance in Benchmarks: Gemini 3 Pro has topped the leaderboards in almost all major AI benchmarks, including Humanity’s Last Exam, ARC-AGI-2, GPQA Diamond, AIME 2025, SWE-Bench Verified, t2-bench, and Vending-Bench 2.
Suitable Applications for Gemini 3 Pro
- Integrated Analysis of Extremely Complex Multimodal Data: Advanced analysis involving multiple information formats, such as analyzing large-scale media content (TV programs, movies, advertising campaigns), assisting medical image diagnosis, and anomaly detection from surveillance camera footage.
- Deep Understanding and Analysis of Ultra-Long Documents/Entire Codebases: Reading entire corporate knowledge bases, operating system-level code, and thousands of pages of specialized books or legal case collections to grasp their structure and problems.
- Advanced Research and Development and Innovation Creation: Reviewing cutting-edge scientific papers and discovering new research themes, predicting technology trends, and building complex simulation models.
- Advanced Content Generation Based on Massive Multimodal Data: Creating detailed and comprehensive reports, documentary scripts, and educational content based on vast information sources (text, images, video).
Specific Use Cases for Gemini 3 Pro
- Example 1: Formulating a Go-to-Market Strategy from Multiple Product Videos, Customer Reviews, and Competitive Analysis Reports
Assessment of Potential Risks and Opportunities: Identify the main potential risks associated with the market launch (e.g., price competition, stricter regulation, battery safety concerns, supply chain issues, slow brand image adoption) and propose mitigation measures for each risk. Present untapped opportunities that FluxGlide should capture (e.g., business-to-business sector, specific niche markets).
We expect a multifaceted and actionable analysis and strategy that deeply understands this diverse text information and derives new insights from their interrelationships, not just a mere list of information."
- Example 2: Extracting Specific Precedents from a Large Set of Legal Documents and Assessing their Applicability to the Current Case
[Information Provided]: Company B's complaint regarding the current lawsuit: Company B's claims, details of the allegedly infringed algorithm, amount of damages claimed, and supporting evidence (alleged traces of reverse engineering, code similarity analysis results, etc.). (Omitted)
Through this brainstorming session, we expect an extremely advanced analysis and recommendation that deeply understands the entire vast and complex legal documentation, accurately extracts relevant information, and applies it to the current case to derive strategic insights. Utilize multi-step reasoning and overall contextual understanding to present the analysis results and defense strategy through a logical and systematic thought process."
Evaluation of Generated Results
In the market launch strategy for the new product, Gemini 3 Pro clearly defined the target audience from diverse information and presented a detailed execution plan and risk mitigation measures. Furthermore, it extracted critical precedents from vast legal documents and deeply analyzed their impact on the current trial and the defense strategy. Its comprehensive integration of multifaceted information and advanced legal reasoning provided responses that are extremely valuable for solving complex problems in both business and law.
Model Comparison: GPT 5.1 vs GPT-5.1 Thinking vs Gemini 3 Pro
Feature | GPT 5.1 | GPT-5.1 Thinking | Gemini 3 Pro |
Developer | OpenAI | OpenAI | Google AI |
Release Date | November 12 (US Time) | November 12 (US Time) | November 2025 |
Area of Expertise | Overwhelming intelligence, advanced language processing, coexistence of conversationality and performance, broad and diverse tasks. | Multi-stage reasoning, deep insight, complex decision-making, adaptive reasoning. | Ultimate multimodal integration, ultra-large-scale context, advanced data analysis, reasoning agent, innovation of multimodal capabilities. |
Context Window | Further extended from ultra-long text tasks (GPT-5). | Same as GPT 5.1, up to 196K tokens. | Up to 2 million tokens (approx. 3,000 pages). |
Multimodal | High compatibility (Text, Image, Audio, Video). | High compatibility (Text, Image, Audio, Video). | Ultimate integrated compatibility (Seamless processing of Text, Image, Audio, Video). |
Depth of Reasoning | Extremely high. | Highest level (Specialized in multi-stage and structural thinking, adaptive reasoning). | Extremely high (Deep analysis from multimodal data). |
Speed | High speed. | Similar to GPT 5.1, but may require time for tasks demanding deep thought (57% faster on simple tasks, 71% longer thinking on complex tasks). | Ultra-high speed. |
Key Features | Multiple tone presets, emphasis on conversationality. | Adaptive reasoning, dynamic time adjustment, enhanced empathy, reduction of jargon. | Generation Interface (Visual Layout, Action View), Gemini Agent, Google Antigravity. |
Optimal Use | Cutting-edge data analysis, innovative planning document creation, highest quality programming support. | Strategic business consulting, scientific research, legal compliance, risk assessment, and complex problem solving. | Ultra-large-scale media content analysis, deep code understanding, advanced research and development, innovation creation from multimodal data. |
Model Selection Points
✅ For the highest level of accuracy, extensive multimodal integration, and solving unexplored domain challenges: Gemini 3 Pro
It maximizes business value in situations where the highest AI thinking power and extensive data processing capability are required, such as integrated analysis of complex multimodal data, deep understanding of ultra-long documents and codebases, and advanced research and development or innovation creation. It is regarded as a "must-use" model with revolutionary benefits for developers, learners, and business professionals.
✅ For overwhelming intelligence, advanced text generation, and the latest language processing tasks: GPT 5.1
It is most effective in situations requiring the highest standard of AI language processing capability and broad problem-solving ability, such as cutting-edge investigative analysis, innovative project planning, creation of the highest quality content, and advanced programming support.
✅ For multi-stage thinking, deep insight, and complex decision-making support: GPT-5.1 Thinking
It demonstrates overwhelming strength in situations that require AI to identify the root cause of a problem and derive structural solutions, such as formulating management strategies, testing hypotheses in scientific research, precise document analysis in legal and auditing fields, and risk assessment in product development.
Summary: Accelerate Your Business with the Latest AI Models
We have explained the characteristics, optimal uses, specific application examples, and a comparison of the latest models: the GPT series (GPT 5.1 and GPT-5.1 Thinking) from OpenAI, and the Gemini series (Gemini 3 Pro) from Google.
AI will continue to evolve, fundamentally transforming the way we work and our creativity. GPT-5.1 has significantly advanced the quality of dialogue by achieving a balance between "conversationality" and performance. Gemini 3 has made revolutionary progress in reasoning, agent functionality, and multimodality, demonstrating overwhelming performance in benchmarks.
By quickly understanding these latest AI models and strategically introducing them to solve your company's challenges, you can enhance competitiveness and seize new business opportunities in a rapidly changing era.
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