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opencode VS Mellum

Compare opencode VS Mellum and see what are their differences

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Do-It-Yourself Data Analytics & Business Intelligence, Powered by AI sponsored
Contents:
  1. ยป Base Details
  2. ยป Videos
  3. ยป Reviews
  4. ยป Alternatives

opencode logo opencode

The AI coding agent, built for the terminal.

Mellum logo Mellum

Mellum-4b-base is JetBrains' first open-source large language model (LLM) optimized for code-related tasks.
  • opencode Landing page
    Landing page //
    2026-04-28
Not present

Analysis of opencode

Overall verdict

  • OpenCode is a solid open-source AI coding assistant that brings terminal-native, model-agnostic development workflows to developers who value flexibility and control over their tooling.

Why this product is good

  • Open-source and transparent, allowing developers to inspect, modify, and self-host the tool
  • Model-agnostic design lets you use various LLM providers rather than being locked into a single vendor
  • Terminal-native workflow integrates smoothly into existing developer environments
  • Active development and community support keep the tool evolving with new features
  • Can help automate coding tasks, refactoring, and code understanding directly from the command line

Recommended for

  • Developers who prefer command-line and terminal-based workflows
  • Teams and individuals wanting flexibility to choose their own AI model providers
  • Open-source enthusiasts who value transparency and self-hosting options
  • Engineers looking to automate repetitive coding tasks and speed up development
  • Privacy-conscious users who want more control over their data and tooling

Analysis of Mellum

Overall verdict

  • Mellum is a solid, purpose-built code completion model from JetBrains, offering strong performance for developer-focused tasks while being open and relatively lightweight compared to general-purpose LLMs.

Why this product is good

  • It is specifically optimized for code completion rather than being a general-purpose model, making it efficient for its intended use case
  • Developed by JetBrains, a company with deep expertise in developer tools and IDEs
  • Openly available on Hugging Face, allowing developers to experiment, fine-tune, and self-host
  • Relatively lightweight and focused, which can mean faster inference and lower resource requirements
  • Trained on a large corpus of code across multiple programming languages

Recommended for

  • Developers looking for a specialized code completion model
  • Teams wanting to self-host or fine-tune an open code model
  • Researchers exploring code-focused language models
  • Integration into IDEs and developer tooling
  • Users who prefer a focused, efficient model over large general-purpose LLMs for coding tasks

opencode videos

+ Add

OpenCode: FASTEST AI Coder + Opensource! BYE Gemini CLI & ClaudeCode!

More videos:

  • Review - OpenCode: The ULTIMATE AI Coding Agent (By SST)
  • Review - FREE OpenCode SST Beats Google Gemini CLI, Claude Code, & Codex?! Open Source AI Coding CLI

Mellum videos

+ Add

Owner of Pike Place Chowder Larry Mellum On King 5 TV

More videos:

  • Review - Jetbrains AI Mellum LLM: 4x schneller entwickeln mit KI-Power

Category Popularity

0-100% (relative to opencode and Mellum)

opencode

Mellum

Developer Tools
95 95%
Developer Tools
5% 5
AI
92 92%
AI
8% 8
Coding
91 91%
Coding
9% 9
Terminal Tools
100 100%
Terminal Tools
0% 0

User comments

Share your experience with using opencode and Mellum. For example, how are they different and which one is better?
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Social recommendations and mentions

Based on our record, opencode seems to be more popular. It has been mentiond 71 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

opencode mentions (71)

  • GLM-5.3: Frontier Coding with Emergent Cyber Capabilities
    What the person above is suggesting: * https://pi.dev/ * https://omp.sh/ Personally I also think that OpenCode is nice, their CLI version is enjoyable and their desktop/web version is mostly okay: * https://opencode.ai/. - Source: Hacker News / 3 days ago
  • Trying Bifrost: An AI Gateway That Simplified My Setup
    I wired it into OpenCode, an open-source coding harness similar to Claude Code and Codex. I'm using an OpenCode Zen key and a Gemini key, and together, these give me access to multiple SOTA models for free, without touching a separate dashboard for each provider. - Source: dev.to / 13 days ago
  • ๐ŸŒฑ OpenSpec Is Built for Brownfield. I Used It to Build From Nothing.
    I drove it from my coding-agent with a handful of commands. - Source: dev.to / 15 days ago
  • Grammar.lol: open-source Grammarly using existing ChatGPT or Grok Subscription
    Https://pi.dev/docs/latest/providers#openai-codex is specific that it "Requires ChatGPT Plus or Pro subscription". https://opencode.ai are also both specific that it's for "Plus/Pro" subscriptions. Is there some link where you saw free tier Codex use in non-official apps is allowed by OpenAI? (I have used the free tier in the official Codex app, but as you said, labs can have different rules for official vs... - Source: Hacker News / 19 days ago
  • ZCode: Claude Code from the Makers of GLM
    Https://opencode.ai/ OpenCode was the first agent harness I used, and I have always like it. You can configure a wide variety of providers, but it's open source and has a number of core contributors. The other opinionated option is Pi (the Pi agent harness). This is a great lightweight option and also supports a number of providers. You can also use local model servers. - Source: Hacker News / about 2 months ago
View more

Mellum mentions (0)

We have not tracked any mentions of Mellum yet. Tracking of Mellum recommendations started around May 2025.

What are some alternatives?

When comparing opencode and Mellum, you can also consider the following products

Claude Code - Transform hours of debugging into seconds with a single command. Experience coding at thought-speed with Claude's AI that understands your entire codebaseโ€”no more context switching, just breakthrough results.

Cursor - The AI-first Code Editor. Build software faster in an editor designed for pair-programming with AI.

Void Editor - Void is an open source Cursor alternative. Full privacy. Fully-featured.

Google Antigravity - Google Antigravity - Build the new way

warp by spolu - Secure and simple terminal sharing

Windsurf Editor - Tomorrow's editor, today. Windsurf Editor is the first AI agent-powered IDE that keeps developers in the flow. Available today on Mac, Windows, and Linux.

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