# Code completion (AI)

**Source:** https://promtable.com/glossary/code-completion

> AI code completion is the inline suggestion of code as a developer types — the autocomplete category dominated by Cursor Tab, GitHub Copilot, Windsurf, Tabnine, and Codeium in 2026.

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AI code completion is the inline suggestion of code as a developer types — the autocomplete category dominated by Cursor Tab, GitHub Copilot, Windsurf, Tabnine, and Codeium in 2026.

Code completion in 2026 has moved past line-by-line autocomplete. Modern systems propose multi-line blocks, multi-file diffs, function bodies, and even entire features. Quality is measured by acceptance rate (what fraction of suggestions developers accept) and by quality-of-accepted (do the accepted suggestions actually work). Best-in-class in 2026: Cursor Tab and Codeium-family models match or beat the developer on routine code, with Copilot strong on mainstream tasks. Latency matters: completions must arrive in 200ms or developers stop trusting them.

## Common mistakes

- Accepting suggestions without reading them — quality varies wildly.
- Disabling completion when an agent mode would serve better — different jobs.

## Related terms

- [agent](https://promtable.com/glossary/agent)
- [system-prompt](https://promtable.com/glossary/system-prompt)

*Last updated: 2026-06-01*
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Original page: https://promtable.com/glossary/code-completion
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