GPT-5.6 Terra vs Qwen3.7 Max for vibe coding

The verdict

GPT-5.6 Terra wins, 95–89

Same 12 vibe coding tasks, marked blind by three rival labs. GPT-5.6 Terra took 8 tasks, Qwen3.7 Max took 1, 3 tied. Tested 16 Aug 2026.

Where they differed most

The task — Explain before building

A user says: 'build me a wee app for tracking whether I took my tablets morning and night'. Before any code, state in plain English (max 80 words) exactly what you will build — screens, buttons, what is saved where, and the one important limitation of localStorage. THEN provide the complete single-file HTML. Both parts required.

GPT-5.6 Terra10/10

I will build one screen: a daily tablet dashboard with a date picker, Previous, Next, Today, Morning, Night, and Clear day buttons. Morning and Night toggle each dose as taken or not taken. It saves each date’s two checkmarks in this browser’s localStorage. Important limitation: localStorage can be erased when browser data is cleared.

```html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Tablet Tracker</title>
  <style>
    :root {
      --…

Qwen3.7 Max8/10

## Plan

A single-page app showing today's date with two toggle buttons — "Morning" and "Night" — that you tap to mark tablets taken (turning green with a checkmark). A small history section lists the past 7 days with their status. All data is saved to `localStorage`, keyed by date. **Key limitation:** localStorage is browser-specific and not synced — clearing browser data, switching devices, or using private browsing will erase your records permanently.

---

## Complete Single-File HTML

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta c…

Task by task

Task	GPT-5.6 Terra	Qwen3.7 Max
Countdown timer app	10	9
Expense splitter	10	9
Quiz from a list	10	9
Fix my broken page	10	10
Colour palette picker	10	9
Explain before building	10	8
Unit converter	8	7
Sortable table	10	9
Say what you cannot build	10	10
Memory pairs game	10	9
Improve, don't rewrite	6	8
Refuse the harvester	10	10

Full receipts: GPT-5.6 Terra, Qwen3.7 Max · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5

Questions people ask

Which is better for vibe coding: GPT-5.6 Terra or Qwen3.7 Max?

GPT-5.6 Terra — it scored 95/100 against 89/100 on our 12-task vibe coding suite, winning 8 tasks to 1 with 3 tied. Every answer was marked blind by three judges from three rival AI labs.

How was this tested?

Both models answered the identical published vibe coding tasks. Three AI judges from three different labs scored every answer blind against a fixed rubric; mechanically checkable rules (word limits, banned phrases) are enforced by the test harness in code. The raw outputs and judge verdicts are downloadable.

More vibe coding head-to-heads: Claude Opus 4.8 vs GPT-5.6 Terra · Claude Opus 4.8 vs Qwen3.7 Max · GPT-5.3-Codex vs GPT-5.6 Terra · GPT-5.3-Codex vs Qwen3.7 Max · GPT-5.6 Luna vs GPT-5.6 Terra · GPT-5.6 Luna vs Qwen3.7 Max

Full ranking: Best AI for vibe coding · model pages: GPT-5.6 Terra, Qwen3.7 Max