Best AI for essay writing / head-to-head
GPT-5.6 Luna vs GPT-5.6 Solfor essay writing
GPT-5.6 Sol wins, 95–91
Same 12 essay writing tasks, marked blind by three rival labs. GPT-5.6 Sol took 3 tasks, GPT-5.6 Luna took 2, 7 tied. Tested 13 Aug 2026.
Where they differed most
Write a 350-word argumentative essay answering: should secondary schools ban smartphones during the school day? Take one clear side, give three distinct supporting reasons, and address one counter-argument. Do not use the phrases 'in conclusion' or 'in today's world'.
Secondary schools should ban smartphones during the school day because unrestricted access undermines learning, weakens relationships, and creates avoidable risks. A school is meant to provide a focused environment where students can think, participate, and develop independence; constant phone access works against all three goals. First, smartphones are powerful distractions. Notifications, messages, and the temptation to check social media interrupt concentration, even when a phone remains in a student’s pocket. Research and classroom experie…
Secondary schools should ban students from using smartphones throughout the school day, while allowing devices to be stored securely for emergencies and collected afterward. Although phones can support communication and quick research, their constant presence undermines the central purposes of school: sustained attention, healthy social development, and fair access to learning. A clear ban would create calmer, safer, and more productive classrooms. First, smartphones damage concentration. Lessons require students to listen, question, remember,…
Task by task
| Task | GPT-5.6 Luna | GPT-5.6 Sol |
|---|---|---|
| Structured argument | 5 | 8 |
| Essay plan | 10 | 9 |
| Tighten flabby prose | 10 | 9 |
| Hold a word count | 9 | 9 |
| Adapt for the reader | 10 | 10 |
| Introduction only | 10 | 10 |
| Steelman the other side | 10 | 10 |
| Cite honestly | 7 | 10 |
| Fix the structure | 10 | 10 |
| Formal to plain | 8 | 9 |
| Conclusion that adds something | 10 | 10 |
| Refuse to pad | 10 | 10 |
Full receipts: GPT-5.6 Luna, GPT-5.6 Sol · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for essay writing: GPT-5.6 Luna or GPT-5.6 Sol?
GPT-5.6 Sol — it scored 95/100 against 91/100 on our 12-task essay writing suite, winning 3 tasks to 2 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 essay 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.
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Full ranking: Best AI for essay writing · model pages: GPT-5.6 Luna, GPT-5.6 Sol