Best AI Agent Builders for Claude Sonnet 4.5

The Gemini Enterprise Agent Platform provides an all-encompassing range of AI Agent Builders, empowering organizations to design and personalize intelligent agents suited for distinct functions. These innovative tools enable users to create, train, and launch agents capable of streamlining workflows, handling customer engagements, and improving decision-making capabilities. By utilizing pre-existing models, businesses can expedite the creation and implementation of AI agents, significantly shortening the time needed to reach the market. New users are granted $300 in complimentary credits, allowing them to explore various agent-building features and refine solutions that align with their specific business requirements. The platform boasts an intuitive interface and robust support for ongoing enhancements, ensuring that companies can effectively scale their AI agent solutions as necessary.

StackAI is an enterprise AI automation platform that allows organizations to build end-to-end internal tools and processes with AI agents. It ensures every workflow is secure, compliant, and governed, so teams can automate complex processes without heavy engineering. With a visual workflow builder and multi-agent orchestration, StackAI enables full automation from knowledge retrieval to approvals and reporting. Enterprise data sources like SharePoint, Confluence, Notion, Google Drive, and internal databases can be connected with versioning, citations, and access controls to protect sensitive information. AI agents can be deployed as chat assistants, advanced forms, or APIs integrated into Slack, Teams, Salesforce, HubSpot, ServiceNow, or custom apps. Security is built in with SSO (Okta, Azure AD, Google), RBAC, audit logs, PII masking, and data residency. Analytics and cost governance let teams track performance, while evaluations and guardrails ensure reliability before production. StackAI also offers model flexibility, routing tasks across OpenAI, Anthropic, Google, or local LLMs with fine-grained controls for accuracy. A template library accelerates adoption with ready-to-use workflows like Contract Analyzer, Support Desk AI Assistant, RFP Response Builder, and Investment Memo Generator. By consolidating fragmented processes into secure, AI-powered workflows, StackAI reduces manual work, speeds decision-making, and empowers teams to build trusted automation at scale.

Devin is an advanced software development assistant powered by AI, created to work in tandem with engineering teams to streamline and enhance coding processes. It assists with various tasks such as initiating repositories, coding, debugging errors, and executing migrations, functioning either independently or in collaboration with human developers. Over time, Devin improves its efficiency by learning from provided examples. Its implementation has resulted in substantial time and financial savings on extensive projects, exemplified by its use at Nubank, where it achieved migration speeds 8 to 12 times faster and cut costs by more than 20 times. Additionally, Devin excels in both refactoring code and automating repetitive engineering tasks, making it an invaluable tool for developers looking to optimize their workflow. Its ability to continuously adapt ensures that it remains an essential asset in the ever-evolving landscape of software development.

Microsoft Foundry provides a unified environment for building AI-powered applications and agents that reflect your organization’s knowledge, workflows, and security standards. Developers can tap into more than 11,000 cutting-edge models, instantly benchmark them, and route intelligently for real-time performance gains. The platform simplifies development with a consistent API, prebuilt SDKs, and solution templates that accelerate integration with existing systems. Foundry also incorporates enterprise-grade governance, providing centralized monitoring, compliance controls, and secure model operations across all teams. Organizations can embed AI directly into tools they already use — such as GitHub, Visual Studio, and Fabric — to streamline development. Its interoperability with cloud infrastructure and business data ensures every model is grounded, accurate, and production-ready. From automating internal workflows to powering transformative customer experiences, Foundry enables high-impact AI at scale. By combining model breadth, developer velocity, and enterprise security, Microsoft Foundry delivers an unmatched foundation for modern AI innovation.

Thesys Agent Builder is a no-code solution designed for the development and deployment of interactive AI applications that utilize structured user interfaces such as charts, cards, tables, forms, slides, and reports, all driven by the C1 Generative UI engine. Users have the flexibility to upload various data types, including files, URLs, and databases, while also connecting to different tools, setting the agent’s tone and behavior through natural language commands, and choosing styles that align with their brand identity, ultimately enabling them to launch a live agent for web use or site embedding without the need for frontend coding. This platform allows the creation of AI agents that efficiently analyze and visualize data, respond to inquiries with engaging insights, produce visual summaries and reports, and deliver comprehensive, actionable responses derived from integrated data sources in a matter of minutes. It prioritizes genuine interactivity and practical functionality, transforming conversational exchanges into dynamic UI components that empower users to delve into, assess, and act upon the information presented. By streamlining the development process, Thesys Agent Builder makes advanced AI technology accessible to users without coding skills, promoting a more inclusive approach to interactive application creation.

Skymel is an innovative cloud-native platform for AI orchestration that centers around its real-time Orchestrator Agent (OA) and the accompanying AI assistant, ARIA. The Orchestrator Agent facilitates the creation of both fully automated runtime agents and dynamic agents managed by developers, which can easily integrate with any device, cloud service, or neural network framework. Utilizing NeuroSplit’s advanced distributed-compute technology, it enhances inference efficiency by intelligently directing each request to the most suitable model and execution environment—whether that be on-device, in the cloud, or a hybrid setup—all while standardizing error handling and significantly lowering API costs by 40–95%, thus boosting overall performance. Built on the foundation of OA, Skymel ARIA provides a cohesive and synthesized response to any inquiry by coordinating real-time access to AI models like ChatGPT, Claude, and Gemini, effectively eliminating the need for cumbersome manual prompt chains and the hassle of managing multiple subscriptions. This seamless integration and orchestration of AI tools not only streamlines workflows but also empowers users with a more efficient and user-friendly experience.

LaunchLemonade empowers businesses to create, implement, and expand personalized AI agents effortlessly, eliminating the need for any coding, thereby enabling these agents to operate around the clock for various functions such as lead generation, marketing initiatives, customer assistance, and internal processes. The platform features an intuitive, no-code interface that allows users to craft AI assistants, link them to various data sources like Notion and Google Drive, integrate with automation platforms such as Zapier, and seamlessly embed these agents into websites or operational workflows. Additionally, users can take advantage of multi-model capabilities, orchestrate workflows involving multiple agents, upload knowledge bases, and achieve smooth integration with their existing technology ecosystems. The service brands itself as the "Shopify or WordPress of AI agent creation," catering specifically to agencies, small to medium-sized businesses, and service-oriented professionals eager to deploy AI-driven assistants without the necessity of hiring technical expertise. This innovative solution not only streamlines the development process but also democratizes access to advanced AI functionalities for a wider audience.

Amazon Bedrock is a comprehensive service that streamlines the development and expansion of generative AI applications by offering access to a diverse range of high-performance foundation models (FMs) from top AI organizations, including AI21 Labs, Anthropic, Cohere, Meta, Mistral AI, Stability AI, and Amazon. Utilizing a unified API, developers have the opportunity to explore these models, personalize them through methods such as fine-tuning and Retrieval Augmented Generation (RAG), and build agents that can engage with various enterprise systems and data sources. As a serverless solution, Amazon Bedrock removes the complexities associated with infrastructure management, enabling the effortless incorporation of generative AI functionalities into applications while prioritizing security, privacy, and ethical AI practices. This service empowers developers to innovate rapidly, ultimately enhancing the capabilities of their applications and fostering a more dynamic tech ecosystem.