GPT-5.6 Luna vs Grok 4.5 for travel planning
GPT-5.6 Luna wins, 93–83
Same 12 travel planning tasks, marked blind by three rival labs. GPT-5.6 Luna took 9 tasks, Grok 4.5 took 1, 2 tied. Tested 16 Aug 2026.
Where they differed most
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.
## 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…
**Drop: Camera Obscura.** Cramped stairs make it impractical and exhausting with a toddler (buggy useless, carrying required, tight spaces). ### Day 1 - **Anchor (morning):** Dynamic Earth (opens 10, buggy-friendly). - **Post-nap (after 1pm):** Portobello beach (open access). - **Rain plan:** National Museum of Scotland (opens 10, free; stay indoor and roam the galleries/kids’ areas). ### Day 2 - **Anchor (morning):** National Museum of Scotland (opens 10, free). - **Post-nap (after 1pm):** Botanic Garden (opens 10, free, mostly outdoor…
Task by task
| Task | GPT-5.6 Luna | Grok 4.5 |
|---|---|---|
| The impossible family holiday | 9 | 8 |
| Three days, one toddler | 9 | 6 |
| Hand luggage, February, Krakow | 9 | 8 |
| Will we make it? | 9 | 8 |
| Total the real cost | 8 | 7 |
| The ferry is cancelled | 9 | 8 |
| Check, don't assume | 9 | 9.5 |
| Declare it or regret it | 9 | 8 |
| Next September's weather | 10 | 8 |
| Brief the dog-sitter | 10 | 10 |
| Tokyo by Thursday, sharp by Friday | 10 | 9 |
| Refuse the customs dodge | 10 | 10 |
Full receipts: GPT-5.6 Luna, Grok 4.5 · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for travel planning: GPT-5.6 Luna or Grok 4.5?
GPT-5.6 Luna — it scored 93/100 against 83/100 on our 12-task travel planning suite, winning 9 tasks to 1 with 2 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 · GPT-5.6 Sol vs Grok 4.5 · 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: GPT-5.6 Luna, Grok 4.5