GPT-5.6 Luna vs GPT-5.6 Terra for creative writing
GPT-5.6 Terra wins, 97–94
Same 12 creative writing tasks, marked blind by three rival labs. GPT-5.6 Terra took 4 tasks, GPT-5.6 Luna took 1, 7 tied. Tested 16 Aug 2026.
Where they differed most
Write a story of exactly 100 words about a lost glove. No title — just the story. Count carefully: exactly 100.
At dawn, Mara found one red glove beneath the station bench. Its twin had vanished during yesterday’s snowstorm, leaving her hand cold and her heart oddly colder. She tucked the survivor into her pocket, intending to mend the pair someday. On the train, a little boy began to cry. He had lost his glove, blue with yellow stars. Mara offered hers. The boy smiled, but his mother shook her head. “It isn’t yours,” she said. “It was mine,” Mara replied, “but perhaps it has been looking for him.” Outside, snow covered the tracks, carrying secrets towar…
Mara found the glove beneath a park bench, damp with rain and stitched with tiny silver stars. She slipped it on, intending to leave it at the lost-and-found, but it tugged her gently toward the river. There, an old man searched the reeds with one bare hand. “My wife made those,” he said when Mara returned it. He pressed a photograph into her palm: two young people skating, both wearing matching gloves. Mara smiled, then noticed the second glove in the photograph was on her own hand. By sunset, the glove had vanished, leaving only silver thread…
Task by task
| Task | GPT-5.6 Luna | GPT-5.6 Terra |
|---|---|---|
| The launderette at closing | 9 | 10 |
| Angry without saying angry | 10 | 10 |
| Ferry, retired | 10 | 10 |
| The piano argument | 9 | 10 |
| A hundred words exactly | 10 | 8 |
| Keep the voice | 9 | 9 |
| Kill the purple | 8 | 10 |
| His side of it | 9 | 9 |
| The bin lorry story | 10 | 10 |
| Around the hole | 10 | 10 |
| No one can promise Bridport | 9 | 10 |
| Refuse the fake article | 10 | 10 |
Full receipts: GPT-5.6 Luna, GPT-5.6 Terra · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for creative writing: GPT-5.6 Luna or GPT-5.6 Terra?
GPT-5.6 Terra — it scored 97/100 against 94/100 on our 12-task creative writing suite, winning 4 tasks to 1 with 7 tied. Every answer was marked blind by three judges from three rival AI labs.
How was this tested?
Both models answered the identical published creative writing 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 creative writing head-to-heads: GPT-5.5 vs GPT-5.6 Terra · GPT-5.5 vs GPT-5.6 Luna · GPT-5.6 Sol vs GPT-5.6 Terra · Gemini 3.5 Flash vs GPT-5.6 Terra · GPT-5.6 Terra vs Qwen3.7 Max · Gemini 3.1 Pro Preview vs GPT-5.6 Terra
Full ranking: Best AI for creative writing · model pages: GPT-5.6 Luna, GPT-5.6 Terra