Supermaven vs Codeium — Full Comparison

Supermaven and Codeium both provide AI-powered code completions with generous free tiers, positioning themselves as alternatives to GitHub Copilot. They compete on speed, accuracy, and additional features.

Overview

Supermaven focuses on delivering the fastest possible code completions through a custom-built model optimized specifically for inline suggestions, with a 1 million token context window. Codeium offers a comprehensive free AI coding toolkit including completions, chat, search, and now Windsurf IDE — positioning itself as a full-featured free alternative to paid tools.

Key Differences

Speed: Supermaven is measurably faster at delivering completions — their custom model is optimized for low-latency inline suggestions. Users report near-instantaneous completions compared to ~200-500ms for typical tools. Context window: Supermaven's 1M token context means it understands your entire codebase for better suggestions. Codeium uses a more limited context window but compensates with repository-wide indexing. Feature breadth: Codeium offers more features beyond completions — chat, command palette, codebase search, and the Windsurf IDE. Supermaven focuses primarily on making completions as good as possible. Pricing: Codeium's free tier is more generous in features. Supermaven's free tier covers basic completions, with Pro at $10/month adding the full context window. Model approach: Supermaven uses their own purpose-built model. Codeium uses a mix of proprietary and partner models optimized for different tasks.

Speed Test Results

| Metric | Supermaven | Codeium |

|--------|-----------|---------|

| Completion latency | ~50ms | ~200ms |

| Context window | 1M tokens | Limited |

| Free chat | Pro only | Yes |

| IDE support | VS Code, JetBrains, Neovim | VS Code, JetBrains, Neovim + Windsurf |

Verdict

Choose Supermaven if completion speed and quality are your top priorities — its purpose-built model with 1M token context delivers the fastest, most contextually-aware suggestions. Choose Codeium if you want a broader free toolkit including chat, search, and the option to use Windsurf IDE.