How IntelliJ IDEA 2026.1 Turns Your IDE into an Open AI Agent Platform
JetBrains' IntelliJ IDEA 2026.1 release transforms the IDE into an open AI agent platform by integrating multiple AI assistants via the ACP protocol, adding quota‑free smart assistance, expanding language support, enhancing productivity tools, improving stability, and phasing out the Code With Me collaboration feature.
IntelliJ IDEA 2026.1 – Overview
Release date March 26 2026. The IDE is transformed into an open AI‑agent platform.
AI Agent Integration via Agent Client Protocol (ACP)
IDE now includes built‑in support for Codex, Cursor and any AI agent that implements the Agent Client Protocol. An ACP registry UI lets users browse and install agents (e.g., GitHub Copilot, Claude) with a single click. The “any AI, any integration” model allows developers to select different agents for refactoring, unit‑test generation, code‑logic analysis, etc., within the same project.
Quota‑Free Smart Assistance
Post‑edit suggestions and other smart‑assistance actions no longer consume JetBrains AI Pro subscription quotas. Suggestions can be applied at the current cursor location or across the whole file, preserving code consistency without additional cost.
Language and Ecosystem Support
Java 26 preview features (pattern matching for switch, lazy constants) are supported out‑of‑the‑box.
Kotlin 2.3.20 support includes nested type aliases and exhaustive when expression checks.
New C/C++ plugin provides advanced code assistance, real‑time quality inspections and refactoring tools for performance‑critical development.
Spring and JPA Enhancements
Spring runtime insights allow developers to view injected beans, endpoint security settings and property values without stopping the application. Kotlin‑aware JPA fixes improve handling of Jakarta Persistence entities written in Kotlin.
Productivity Features
Command completion now includes AI actions and postfix templates.
Git work‑tree support enables creation of isolated work‑trees for urgent fixes while AI agents operate on a separate branch.
AI agents (Codex, Claude, etc.) can query and modify databases directly, enabling automated data‑processing workflows.
Stability and Performance
The release resolves more than 1 000 bugs, including 334 user‑reported issues, and fixes 40 UI‑freeze scenarios, maintaining IDE responsiveness despite the expanded AI functionality.
Collaboration Changes
Code With Me real‑time collaboration is deprecated; version 2026.1 is the last release with native support. It will be moved to a separate plugin and the service is planned for shutdown in early 2027.
Adoption Survey
A survey of 11 000 developers shows 90 % have started using AI, 22 % already employ AI coding agents, and 66 % plan to adopt them within the next year.
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