Best AI Coding Agents in Japan - Page 5

Auggie CLI brings Augment’s intelligent coding agent directly into your terminal by leveraging its powerful context engine to analyze code, make edits, and execute tools both interactively and within automated workflows. Developers can install it via npm (requiring Node.js 22+ and a compatible shell), then launch a full-screen interactive session using auggie, complete with real-time streaming, visual progress, and conversational tooling, for debugging, feature development, PR review, or triaging alerts. For automation, Auggie offers streamlined modes ideal for CI/CD pipelines and background tasks. The CLI also supports custom slash commands for repeatable workflows, integrates with external tools and systems via native integrations and Model Context Protocol (MCP) servers, and can be scripted in pipelines or GitHub Actions for tasks like auto-generating PR descriptions.

CodeMender is an AI-powered agent developed by DeepMind for automatically finding, diagnosing, and patching security vulnerabilities in software code. It combines advanced reasoning abilities (via Gemini Deep Think models) with program analysis tools, static analysis, dynamic analysis, differential testing, fuzzing, and SMT solvers, to identify root causes of flaws, generate high-quality fixes, and validate them to avoid regressions or functional breakage. CodeMender operates by proposing patches that adhere to style rules and structural correctness, and then uses critique and verification agents to check changes and self-correct if issues arise. It can also proactively rewrite existing code using safer APIs or data structures (for example, applying -fbounds-safety annotations to prevent buffer overflows). To date, CodeMender has upstreamed dozens of patches in large open source projects (including ones with millions of lines of code).

Aardvark is an autonomous security-research agent powered by GPT-5, designed to act like a human security researcher, continuously analyzing source-code repositories, developing threat models, scanning commits for vulnerabilities, validating exploitability in sandboxed environments, and proposing targeted patches for human review. Unlike traditional tools that rely purely on fuzzing or software-composition analysis, Aardvark uses an LLM-based reasoning pipeline to interpret code behavior and integrate directly into existing developer workflows (e.g., GitHub, code-review pipelines, Codex for patch generation). It supports historical scanning of entire repositories at initial connection, commit-level scanning thereafter, automatic patch generation and verification, and human-auditable annotations for each finding. Early internal benchmarks at OpenAI show detection recall of 92% in repositories seeded with known or synthetic vulnerabilities.

GPT-5-Codex-Mini is a compact and cost-efficient version of GPT-5-Codex designed to deliver roughly four times more usage with only a slight tradeoff in capability. It’s optimized for handling routine or lighter programming tasks while maintaining reliable output quality. Developers can access it through the CLI and IDE extension by signing in with ChatGPT, with API access coming soon. The system automatically suggests switching to GPT-5-Codex-Mini when users near 90% of their rate limits, helping extend uninterrupted usage. ChatGPT Plus, Business, and Edu users receive 50% higher rate limits, offering more flexibility for frequent workflows. Pro and Enterprise accounts are prioritized for faster processing, ensuring smoother, high-speed performance across larger workloads.

GPT-5.2-Codex is OpenAI’s most advanced agentic coding model, built for complex, real-world software engineering and defensive cybersecurity work. It is a specialized version of GPT-5.2 optimized for long-horizon coding tasks such as large refactors, migrations, and feature development. The model maintains full context over extended sessions through native context compaction. GPT-5.2-Codex delivers state-of-the-art performance on benchmarks like SWE-Bench Pro and Terminal-Bench 2.0. It operates reliably across large repositories and native Windows environments. Stronger vision capabilities allow it to interpret screenshots, diagrams, and UI designs during development. GPT-5.2-Codex is designed to be a dependable partner for professional engineering workflows.

Tonkotsu is a desktop application that lets developers manage a team of AI coding agents from a document-centric interface, enabling a structured plan, code, and verify workflow that scales software development by delegating multiple coding tasks in parallel while maintaining human oversight and control. From within a single doc, users set project direction and context, Tonkotsu analyzes codebases and drafts detailed plans, and then developers assign and manage dozens of autonomous tasks without micromanagement; once work is complete, teams review diffs, comment inline, and approve changes, with automatic build, lint, test, conflict resolution, and merges to streamline iteration, ensuring no commits are finalized without explicit approval. Built for professional developers on macOS and Windows, it supports planning across multiple repositories, symbol lookup for context continuity, task dependency specification to order work logically, and automatic verification to enhance accuracy.

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, designed to handle complex professional work on a computer. It combines frontier-level coding performance with advanced reasoning and real-world task execution. The model is faster than previous Codex versions and can manage long-running tasks involving research, tools, and deployment. GPT-5.3-Codex supports real-time interaction, allowing users to steer progress without losing context. It excels at software engineering, web development, and terminal-based workflows. Beyond code generation, it assists with debugging, documentation, testing, and analysis. GPT-5.3-Codex acts as an interactive collaborator rather than a single-turn coding tool.

GPT-5.3-Codex-Spark is an ultra-fast coding model designed for real-time collaboration inside Codex. Built as a smaller version of GPT-5.3-Codex, it delivers over 1000 tokens per second when served on low-latency Cerebras hardware. The model is optimized for interactive coding tasks, enabling developers to make targeted edits and see results almost instantly. With a 128k context window, Codex-Spark supports substantial project context while maintaining speed. It focuses on lightweight, precise edits and does not automatically run tests unless prompted. Infrastructure upgrades such as persistent WebSocket connections significantly reduce latency across the full request-response pipeline. Released as a research preview for ChatGPT Pro users, Codex-Spark marks the first milestone in OpenAI’s partnership with Cerebras.

CometCore delivers automated AI-enhanced chat for multimedia, code & content creation across diverse digital formats. Empowering all types of creators with AI chat & coding tools. Discover the potential of GPT-4 automation through our connected platform. Effortlessly create custom AI agents to streamline daily tasks and perform common actions with user-friendly commands. Empower your personalized AI assistant to reserve tables, order groceries, and more, maximizing productivity while simplifying your life. Experience the future of AI-driven task management today. Interact with GPT-4 through text commands or voice recordings in any language. Our user-friendly platform caters to your preferred mode of communication, providing seamless access to powerful AI capabilities and breaking down language barriers. Versatile AI agents for seamless productivity and communication. CometCore's complete suite of AI-powered creative tools.

CodeRide eliminates the context reset cycle in AI coding. Your assistant retains complete project understanding between sessions, so you can stop repeatedly explaining your codebase and never rebuild projects due to AI memory loss. CodeRide is a task management tool designed to optimize AI-assisted coding by providing full context awareness for your coding agent. By uploading your task list and adding AI-optimized instructions, you can let the AI take care of your project autonomously, with minimal explanation required. With features like task-level precision, context-awareness, and seamless integration into your coding environment, CodeRide streamlines the development process, making AI solutions smarter and more efficient.

ClackyAI is an advanced AI-powered coding platform designed to accelerate software development by transforming issue descriptions directly into pull requests. It offers full codebase awareness, providing real-time diagnostics and proactive issue detection to help developers debug seamlessly. The platform enables teams to collaborate effectively with multi-agent task coordination and shared context, speeding up parallel workflows. ClackyAI tracks every AI-generated code change with a task time machine, offering full visibility and control over modifications. Built for serious development, it ensures production-ready systems with minimal manual effort. Currently in invite-only public beta, ClackyAI empowers developers to innovate faster and write higher-quality code.

Base44 is an all-in-one AI platform designed to enable users to build fully functioning apps without any coding. It eliminates the need for complex integrations, providing built-in features like databases, AI integration, email systems, authentication, analytics, and storage, allowing users to focus on their ideas. It helps users save time and money by creating custom solutions that fit their needs, replacing expensive SaaS products, and developing tailored back-office tools, personal productivity apps, customer portals, and automated business processes. Base44 also facilitates the rapid development of MVPs and prototypes to test concepts quickly. It empowers non-developers to create functional applications instantly, making it ideal for a variety of use cases, from automating workflows to building secure platforms.

​Emergent.sh is an AI-powered, agentic workspace designed to amplify creativity, remove roadblocks, and redefine software development. It offers an all-in-one platform where developers can plan, code, test, and deploy applications seamlessly. Key features include code maintenance and refactoring, such as automating library upgrades, simplifying migrations, and refactoring codebases. For application development and testing, Emergent.sh aids in resolving frontend bugs, integrating SaaS quickly, and boosting testing coverage. In data warehousing, it streamlines migrations, builds efficient ETL pipelines, and preprocesses data effortlessly. Additionally, it supports maintaining documentation, building internal tools, and automating scripting tasks. Backed by Y Combinator, Emergent.sh aims to unlock the future of software development by providing developers with a workspace that enhances productivity and innovation.