ProxyAI (formerly CodeGPT) is a JetBrains IDE plugin that provides AI-powered code assistance including chat, inline editing, code completions, agent-based task execution, commit message generation, and next-edit suggestions. The plugin integrates with multiple LLM providers (OpenAI, Anthropic, Google, Mistral, Ollama, llama.cpp, custom OpenAI-compatible, and its own ProxyAI cloud) and supports local inference via a bundled llama.cpp submodule. It implements an agent framework with a tool system (read, write, edit, bash, web search, diagnostics, debugger control), MCP (Model Context Protocol) client for external tool servers, and ACP (Agent Client Protocol) for external agent integration. The architecture follows IntelliJ Platform conventions: services, actions, tool windows, settings via PersistentStateComponent, and editor listeners. The codebase is a mix of Kotlin (dominant) and Java, with Gradle build system and extensive use of coroutines for async operations.
Continue is an open-source AI coding agent that provides chat, autocomplete, edit, and agent capabilities across VS Code, JetBrains IDEs, and a standalone CLI. The architecture centers on a shared TypeScript core (`core/`) that handles LLM interactions, context providers, tool definitions, indexing, and configuration management. This core is consumed by three frontends: a VS Code extension (`extensions/vscode/`), a JetBrains plugin (`extensions/intellij/`), and a CLI (`extensions/cli/`) with a React-based TUI. A separate React GUI (`gui/`) runs as a webview in the IDE extensions. The system supports 50+ LLM providers through a plugin architecture in `core/llm/llms/` and uses a YAML-based configuration system (`packages/config-yaml/`) with a Hub for sharing assistants. Codebase indexing uses a content-addressed Merkle tree approach with a Rust sync library (`sync/`). The repository is now read-only and deprecated as of the final 2.0.0 release, with the team recommending users migrate to the CLI.