Best AI Coding Assistants for JetBrains IDEs 2026

A JetBrains developer shops for AI differently from a VS Code user, because the IDE already knows your project: its index, inspections and refactorings are the reason you pay for it. The right assistant uses that index instead of fighting it, and the field split in 2026 between JetBrains' own credit plans, plugins from model vendors and open-source agents you point at any key.

Devshot data: Toolradar, the software directory we run, tracked 179 AI coding tools on October 17, 2026, and 88% of them are free, freemium or open source. This list keeps the seven with a current JetBrains plugin or built-in support, because an assistant that cannot see the IDE's index wastes the license you already pay for. Every price below was read on the vendor's own pricing page on October 18, 2026. For the editor-agnostic ranking, see our best AI coding assistants guide.

An AI coding assistant for JetBrains is a plugin or built-in service that completes code, answers questions about your project and runs agents that edit files, inside IntelliJ-based IDEs such as IntelliJ IDEA, PyCharm, WebStorm, GoLand, PhpStorm and Rider.

Three delivery models exist. JetBrains AI is built into the IDE and sells credits that pay for models from OpenAI, Anthropic, Google and xAI at API rates. Vendor plugins (Copilot, Claude Code, Gemini Code Assist, Augment) bring their own subscription. Open-source agents (Kilo Code, Cline) run on whichever model key you supply, and JetBrains' Agent Client Protocol lets you sign in to more than 25 outside agents, including Cursor, Codex and Copilot, from the same AI chat window.

The billing model decides your real cost more than the sticker. Credit plans convert your fee into metered model usage, so a heavy agent week can drain a month's allowance in days, while a flat seat fee hides the meter until a rate limit appears. Knowing how many dollars of usage each plan includes is the only fair way to compare them.

Integration depth matters too. A plugin that opens its edits in the IDE's own diff viewer and reads its inspection results fits the way JetBrains users review code. One that only runs in a terminal tab asks you to give up the IDE's strengths, and that is a poor trade for anyone paying for an Ultimate or Pro license.

For one developer, the yearly bill runs from $0 on Kilo Code, which costs nothing beyond model usage, to $468 on Copilot Pro+, before any extra usage. In between sit JetBrains AI Pro, Copilot Pro at $120 a year, Claude Pro at $17 a month on a yearly plan, Gemini Code Assist Standard at $228 a year at the annual rate, and JetBrains AI Ultimate. The usage included per dollar is the number that separates them.

Our calculation from the vendor pages: AI Pro returns 120 credits a year ($120 of model use) for its fee, 1.2 dollars of usage per dollar paid, and AI Ultimate 420 credits for $300, or 1.4. Copilot Pro returns $180 of AI credits a year for $120 (1.5) and Pro+ $840 for $468 (1.8). Augment Standard returns exactly its fee, $240 of usage for $240 a year, but that pool covers up to 50 people. Credit units differ by vendor, so treat these ratios as a guide to allowance size, not model quality.

For a team of five on annual terms, Copilot Business and Gemini Code Assist Standard each come to $1,140 a year, Kilo Teams to $900 before inference, and Augment Business to $1,200 with the same amount of shared usage over the year. Prices were checked on October 18, 2026 on the JetBrains AI, GitHub Copilot and Copilot plans docs, Claude, Gemini Code Assist, Augment, Kilo Code and Cline pages. JetBrains notes that its displayed prices are approximate and the final price shows at checkout.