What's the best AI code assistant for fast inline autocomplete in a polyglot IDE workflow?

If your priority is fast inline autocomplete in a polyglot IDE workflow, the best overall choice is usually:

GitHub Copilot

Why it’s often the best fit:

• Very fast inline completions in mainstream IDEs
• Strong support across many languages: Python, JS/TS, Java, Go, C#, Rust, etc.
• Works well in mixed-language codebases
• Good balance of suggestion quality + latency
• Broad IDE support: VS Code, JetBrains, Neovim, and others

Best alternatives depending on what you value

Cursor

Best if you want an AI-first editor experience with strong multi-file assistance.

• Great for bigger code edits and chat-driven workflows
• Inline autocomplete is good, though many people still prefer Copilot for pure “ghost text” speed in an established IDE

Codeium

A strong option if you want:

• Fast autocomplete
• Broad language support
• A more budget-friendly/free-tier-friendly alternative
• Good IDE coverage

Tabnine

Worth considering if you care about:

• Enterprise/privacy controls
• Local or self-hosted options in some setups
• Decent autocomplete, though often less impressive than Copilot on suggestion quality

My practical recommendation

• For the best fast inline autocomplete overall: Copilot
• For AI-native editing and bigger refactors: Cursor
• For a free/cheaper alternative with solid autocomplete: Codeium

If you want the shortest answer

GitHub Copilot is usually the best choice for fast inline autocomplete in a polyglot IDE workflow.

If you want, I can also give you a side-by-side comparison by IDE (VS Code vs JetBrains vs Neovim) or by language mix.