Best AI Coding Assistants (September 2026)

1

Windsurf

Top pick

windsurf.com

Best for Developers and engineering teams·Free trial

Windsurf is an AI-powered code editor built to assist developers throughout the coding workflow, from writing and refactoring to debugging. It includes an agentic assistant called Cascade that can understand codebase context, execute multi-step tasks, and make edits across files. The editor also offers autocomplete suggestions and an integrated chat interface for asking questions about code. Windsurf is suited to individual developers and engineering teams looking for an AI-assisted alternative to traditional code editors, supporting common programming languages and integrating into existing development environments.

• Agentic code assistant
• AI autocomplete
• Contextual code chat

2

Continue

Free plan

continue.dev

Best for Developers wanting model choice and open-source flexibility

Continue is an open-source AI coding assistant that integrates into editors such as VS Code and JetBrains IDEs. It allows developers to connect their preferred large language models, including hosted or locally run models, to get code completions, inline edits, and chat-based assistance within the development environment. Because it is open-source and model-agnostic, it appeals to engineering teams wanting control over which AI models process their code and how data is handled. It suits individual developers and organizations with existing model infrastructure or specific privacy requirements.

• Model-agnostic LLM integration
• Inline code editing
• IDE chat assistant

3

GitLab Duo

gitlab.com

Best for Development teams already using GitLab·Free trial

GitLab Duo is a set of AI-powered capabilities built into the GitLab DevSecOps platform, offering code suggestions, a chat assistant, code explanation, test generation, and vulnerability summarization. It works within GitLab's existing workflow, covering the software lifecycle from planning to code review and security scanning rather than functioning as a standalone editor plugin. It is aimed at development teams already using GitLab for source control, CI/CD, and issue tracking who want AI assistance integrated with their existing pipelines, merge requests, and security tooling rather than a separate tool.

• Code suggestions
• Chat assistant
• Vulnerability explanation

4

Amazon Q Developer

Free plan

aws.amazon.com

Best for Developers building applications on AWS

Amazon Q Developer is an AI-powered coding assistant from AWS that provides code suggestions, chat-based assistance, and automated code reviews within popular IDEs and the AWS console. It can generate code, explain functionality, help with debugging, and assist with tasks such as upgrading application versions or writing unit tests. It also integrates with AWS services, helping developers understand infrastructure, troubleshoot issues, and work with cloud resources. The tool suits developers and teams already building on AWS who want coding assistance tied closely to that ecosystem.

• Inline code suggestions
• AWS-integrated chat assistant
• Automated code reviews

5

Aider

aider.chat

Best for Developers who prefer terminal-based workflows·Paid only

Aider is a command-line AI pair-programming tool that connects to large language models to edit code directly in a local git repository. It can create commits automatically, work across multiple files, and understand existing codebases to make targeted changes based on natural-language requests. It supports several LLM providers and integrates with a developer's existing editor and terminal workflow. Aider suits developers who prefer working in the command line and want an AI assistant that operates within version-controlled projects rather than a separate chat interface or IDE plugin.

• Git-integrated code editing
• Multi-file code changes
• Supports multiple LLM providers

6

GitHub Copilot

Free plan

github.com

Best for Individual developers and engineering teams

GitHub Copilot is an AI coding assistant that integrates into editors such as Visual Studio Code, Visual Studio, and JetBrains IDEs. It suggests code completions, whole functions, and boilerplate based on context and comments, and includes a chat interface for explaining code, debugging, and answering programming questions. It supports many languages and frameworks and offers a CLI companion. The tool is built on OpenAI models and is developed by GitHub/Microsoft. It suits individual developers, students, and engineering teams looking to speed up routine coding tasks within existing development workflows.

• Inline code completions
• Chat-based code assistance
• IDE and CLI integration

7

Codeium

Free plan

codeium.com

Best for Developers and engineering teams of any size

Codeium is an AI-powered coding assistant that provides code autocompletion, an in-editor chat interface, and codebase search across a range of programming languages. It integrates with popular IDEs such as VS Code, JetBrains, and Vim, and supports enterprise deployment options including self-hosting for teams with data privacy requirements. Codeium aims to help developers write and understand code faster by suggesting completions and answering context-aware questions about a project. It suits individual developers, startups, and larger engineering teams looking to add AI assistance to existing development workflows.

• Code autocompletion
• In-editor AI chat
• Codebase-aware search

8

Sourcegraph Cody

Free plan

sourcegraph.com

Best for Developers working in large, complex codebases

Cody is an AI coding assistant from Sourcegraph that provides code autocompletion, chat-based question answering, and code generation grounded in a codebase's actual context. It uses code search and graph capabilities to reference relevant files, functions, and dependencies across large repositories, aiming to give more contextually accurate suggestions than assistants limited to open files. Cody integrates with popular IDEs such as VS Code and JetBrains, and supports multiple large language models. It is suited to development teams working in large or complex codebases who want context-aware assistance across an entire repository rather than isolated snippets.

• Codebase-aware chat
• AI code autocompletion
• Multi-LLM support

9

Blackbox AI

Free plan

blackbox.ai

Best for Developers seeking in-editor code generation and search

Blackbox AI is a coding assistant that provides code autocompletion, code generation, and a chat interface for answering programming questions within the developer's workflow. It integrates as an extension for editors such as VS Code and supports multiple programming languages. Features include code search across repositories, explanation of existing code, and generation of snippets from natural language prompts. It is aimed at individual developers and engineering teams looking to speed up routine coding tasks and reduce time spent searching documentation or writing boilerplate code.

• Code autocompletion
• Natural language code generation
• Code search and explanation