Claude Opus 4.6 vs GPT-5.6 Luna for travel planning

The verdict

GPT-5.6 Luna wins, 9386

Same 12 travel planning tasks, marked blind by three rival labs. GPT-5.6 Luna took 5 tasks, Claude Opus 4.6 took 1, 6 tied. Tested 16 Aug 2026.

Where they differed most

The task — Three days, one toddler

Build a 3-day Edinburgh plan using ONLY these, with the opening info given: Castle (9.30-5, steep cobbled approach), Dynamic Earth (10-5, buggy-friendly), National Museum of Scotland (10-5, free), Botanic Garden (10-6, free, mostly outdoors), Camera Obscura (9.30-8, cramped stairs), Portobello beach (open access). Rules a toddler imposes: one anchor activity per day, everything after 1pm assumes the nap happened, and a rain plan every day. Say which attraction you would DROP entirely and why.

# 3-Day Edinburgh with a Toddler

## The DROP: Camera Obscura

It's the obvious cut. Cramped stairs with a toddler means you're either wrestling a buggy you can't use or carrying a increasingly furious child through narrow, crowded stairwells. The "wow" factor is largely visual/optical illusion-based — much of it sails over a toddler's head. Every other option is either more spacious, more toddler-engaging, or both.

---

## Day 1: Old Town — Anchor: **Edinburgh Castle**

| Time | Plan |
|---|---|
| **9:15** | Arrive at Castle Esplanade before…
## Day 1 — Edinburgh Castle day

- **9:30–12:00: Edinburgh Castle — anchor activity**
  - Go early, while your toddler is freshest.
  - The approach is steep and cobbled, so a sturdy buggy or carrier is preferable.
- **12:00–1:00: Finish up and have lunch**
- **After 1:00, assuming the nap happened: National Museum of Scotland**
  - Use this as a flexible, free indoor stop rather than trying to see the whole museum.
  - Open until 5pm.

**Rain plan:** Make the **National Museum** the day’s anchor instead, from 10am. Skip the Castle unless the w…

Task by task

TaskClaude Opus 4.6GPT-5.6 Luna
The impossible family holiday89
Three days, one toddler59
Hand luggage, February, Krakow109
Will we make it?89
Total the real cost88
The ferry is cancelled99
Check, don't assume99
Declare it or regret it89
Next September's weather1010
Brief the dog-sitter1010
Tokyo by Thursday, sharp by Friday810
Refuse the customs dodge1010

Full receipts: Claude Opus 4.6, GPT-5.6 Luna · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5

Questions people ask

Which is better for travel planning: Claude Opus 4.6 or GPT-5.6 Luna?

GPT-5.6 Luna — it scored 93/100 against 86/100 on our 12-task travel planning suite, winning 5 tasks to 1 with 6 tied. Every answer was marked blind by three judges from three rival AI labs.

How was this tested?

Both models answered the identical published travel planning 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 travel planning head-to-heads: GPT-5.6 Luna vs GPT-5.6 Sol · Claude Opus 4.6 vs GPT-5.6 Sol · GPT-5.5 vs GPT-5.6 Luna · Claude Fable 5 vs GPT-5.6 Luna · GPT-5.6 Luna vs GPT-5.6 Terra · Claude Sonnet 5 vs GPT-5.6 Luna

Full ranking: Best AI for travel planning · model pages: Claude Opus 4.6, GPT-5.6 Luna