Community (Gemma-4 · local)

Gemma-4 12B Coder

The free, offline coder — trained only on code that passed its tests.

Context256,000 tokens
PricingFree · runs locally
Tasks tested6
Avg score4.25/10 average
Medals🥇0 🥈0 🥉0
Release2026-06

What is Gemma-4 12B Coder?

Gemma-4 12B Coder is the Community (Gemma-4 · local) frontier model with a 256,000 tokens context window, released 2026-06. Tagline: The free, offline coder — trained only on code that passed its tests..

Pricing detail. A community fine-tune of Google's Gemma-4 12B (xentriom/gemma-4-12B-coder-fable5-composer2.5-v1), Apache-2.0. Free to download and run 100% offline on your own Mac via Ollama — no API, no per-token bill. The Q4_K_M build is 7.4GB.

How I use it inside the Agent OS. Wired into the Agent OS local engine (Local chat + Local Hermes Engine + Agent Kanban) as the free, offline coder. Scored by Claude judge against the same one-shot prompts every other model ran.

What I built with Gemma-4 12B Coder

Every model on Goldie Bench gets the same fixed prompt set — one shot, single HTML file out — and I score the result 0–10 inside the Agent Operating System. Here's what Gemma-4 12B Coder shipped on the bench: 6 one-shot demos across 256,000 tokens of context. Of those, 6 are scored against the field with my honest 0–10 from the source guides at agentos.guide.

Strengths

  • Runs 100% free + offline on a consumer Mac (Q4_K_M, 7.4GB) — no API, no rate limits, nothing leaves the machine
  • Test-verified training (Composer 2.5 + Fable 5) — shipped a clean SaaS landing page and a working particle galaxy one-shot
  • Fast on Apple Silicon — 2.4s cold start, ~35 tokens/sec on an M4 Max

Trade-offs

  • Half its one-shots shipped broken on the bench — a missing canvas append, a missing render loop, and an uncompiled WebGL shader
  • Far below frontier models on complex 3D / WebGL / games — strongest on pages and simple canvas work, not simulations

Best for

  • Free, private, offline coding where nothing can leave your machine
  • Landing pages, simple canvas builds, and code you'll review before shipping
  • Anyone who wants a $0 local coder wired into their Agent OS

Every demo by Gemma-4 12B Coder

6 live demos, sorted by category. Click any tile to play the actual one-shot result. Verdicts and 0–10 scores are pulled from the source guides where I posted them publicly.

Arcade▶ LIVE
Arcade
Game
Neon Snake — a styled canvas board with a glowing pink border, score HUD and monospace title; a playable grid snake. Clean and on-brief, but plain next to frontier arcade builds with particles, screen-shake and audio.
Landing▶ LIVE
Landing
Page
Best gemma build. A clean, professional SaaS landing for 'Aether' — sticky nav (Features / Pricing / Log in), bold hero headline, subhead, sections below the fold. Genuinely strong for a free local 12B. One bug: the hero CTA button renders white-on-white so its label is invisible.
Galaxy▶ LIVE
Galaxy
Sim
A real working three.js particle galaxy — thousands of gold/white points in a disk you can orbit with the mouse. Functional, but flat square particles, no spiral arms and no bloom — well short of the spiral-and-bloom frontier galaxies (Fusion 8.5).
Solar▶ LIVE
Solar
Sim
Broken. It builds the scene, sun and four planets but never starts a render/animation loop (no requestAnimationFrame, no renderer.render) and calls a hallucinated THREE.Ellipse class that doesn't exist. Black screen.
Matrix▶ LIVE
Matrix
Visual
Broken one-shot. The Matrix-rain logic is correct, but the model created the canvas with createElement and never appended it to the DOM — so the page renders nothing. Also a malformed doctype. A real miss.
Plasma▶ LIVE
Plasma
Visual
Broken. It gets a WebGL context and writes vertex/fragment shader source into <script> tags, but never compiles, links or draws them (no createShader, no drawArrays). Nothing renders.

Compare Gemma-4 12B Coder against every other model

Every head-to-head featuring Gemma-4 12B Coder. Verdicts shown for scored pairs.

Gemma-4 12B Coder vs Opus 4.8
Opus 4.8 leads 4–0
Gemma-4 12B Coder vs GLM-5.2
GLM-5.2 leads 4–0
Gemma-4 12B Coder vs Grok
Grok leads 6–0
Gemma-4 12B Coder vs Fusion
Fusion leads 6–0
Gemma-4 12B Coder vs MiniMax M3
MiniMax M3 leads 6–0
Gemma-4 12B Coder vs Fugu Ultra
Fugu Ultra leads 2–0
Gemma-4 12B Coder vs Qwen 3.7
Qwen 3.7 leads 2–0
Gemma-4 12B Coder vs Kimi K2.7
Kimi K2.7 leads 4–1
Gemma-4 12B Coder vs Fugu Mini
Fugu Mini leads 1–0
Gemma-4 12B Coder vs Kimi K2.7 · Fast
2 shared tasks · unscored
Gemma-4 12B Coder vs Kimi K2.7 · No-Think
2 shared tasks · unscored
Gemma-4 12B Coder vs Kimi K2.7 · Quality
2 shared tasks · unscored
Gemma-4 12B Coder vs Claude Fable 5
Reference-only
Gemma-4 12B Coder vs Claude Mythos 5
Reference-only
Gemma-4 12B Coder vs Kilo Code
Reference-only

See all 66 comparisons across every model →

Quick pill index

Direct comparisons against every other scored model on the bench:

Gemma-4 12B Coder vs Opus 4.8 Gemma-4 12B Coder vs GLM-5.2 Gemma-4 12B Coder vs Grok Gemma-4 12B Coder vs Fusion Gemma-4 12B Coder vs MiniMax M3 Gemma-4 12B Coder vs Fugu Ultra Gemma-4 12B Coder vs Qwen 3.7 Gemma-4 12B Coder vs Kimi K2.7 Gemma-4 12B Coder vs Fugu Mini

Read more on agentos.guide: /free-code-engine

The same stack Julian uses

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Every demo on this bench was built inside the Agent Operating System — one prompt, one shot, single HTML file out. The Agent OS, the prompts, the templates, the weekly walkthroughs and 3,600+ founders shipping with it every day all live inside the AI Profit Boardroom.

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258documented wins
38countries
$100k+/mocommunity MRR
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