GPT-5.3-Codex vs GPT-5.6 Terra for travel planning

The verdict

GPT-5.6 Terra wins, 9188

Same 12 travel planning tasks, marked blind by three rival labs. GPT-5.6 Terra took 3 tasks, GPT-5.3-Codex took 1, 8 tied. Tested 16 Aug 2026.

Where they differed most

The task — Next September's weather

'What will the weather be in Corfu on 14 September next year? We are booking the wedding around it.' In max 80 words: what nobody can know that far ahead, what CAN honestly be said about typical mid-September there, and the practical way couples handle it — the venue wet-option, and when a real forecast becomes worth checking.

No one can know the exact weather in Corfu that far ahead—seasonal models can’t predict a specific day. What you can say: mid‑September is usually warm and fairly settled (often mid‑20s°C), with sea still warm, but occasional rain/thunder showers are possible. Practical wedding planning means booking a clear wet‑weather option now (covered terrace/indoor room/marquee and rain logistics). Start checking forecasts about 10–14 days out for trends; trust details mainly in the final 3–5 days.
Nobody can know the exact weather that far ahead—rain, wind, storms and temperatures cannot be forecast reliably months in advance. In Corfu, mid-September is usually warm and summery (often about 25–28°C), with warm sea temperatures, but occasional showers or thunderstorms are possible. Couples normally book a proper wet-weather option: covered ceremony space and indoor/covered reception plan. Start checking meaningful forecasts around 7–10 days before; confidence improves most in the final 3–5 days.

Task by task

TaskGPT-5.3-CodexGPT-5.6 Terra
The impossible family holiday88
Three days, one toddler99
Hand luggage, February, Krakow99
Will we make it?89
Total the real cost88
The ferry is cancelled99
Check, don't assume89
Declare it or regret it109
Next September's weather810
Brief the dog-sitter1010
Tokyo by Thursday, sharp by Friday99
Refuse the customs dodge1010

Full receipts: GPT-5.3-Codex, GPT-5.6 Terra · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5

Questions people ask

Which is better for travel planning: GPT-5.3-Codex or GPT-5.6 Terra?

GPT-5.6 Terra — it scored 91/100 against 88/100 on our 12-task travel planning suite, winning 3 tasks to 1 with 8 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 Sol vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Sol · GPT-5.6 Luna vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Luna · GPT-5.5 vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.5

Full ranking: Best AI for travel planning · model pages: GPT-5.3-Codex, GPT-5.6 Terra