Best AI for essay writing / head-to-head

Claude Fable 5 vs Gemini 3.1 Pro Previewfor essay writing

The verdict

Dead heat: 83 each

Same 12 essay writing tasks, marked blind by three rival labs. Tested 13 Aug 2026.

Where they differed most

The task — Structured argument

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'.

**Why Secondary Schools Should Ban Smartphones During the School Day**

Secondary schools should ban smartphones during school hours because the devices undermine the core purposes of education: learning, social development, and student wellbeing.

First, smartphones are engineered to capture attention, and adolescents are especially vulnerable to their pull. Notifications, games, and social media apps compete directly with lessons for students' focus. Research consistently shows that even the mere presence of a phone on a desk reduces cognitiv…
The presence of smartphones in classrooms has sparked intense debate among educators and parents. While these devices offer unprecedented connectivity, their integration into the educational environment has proven detrimental. Secondary schools must implement a comprehensive ban on smartphones during the school day to protect academic focus, safeguard mental health, and foster genuine social interaction.

First, smartphones are severe academic distractions. The constant ping of notifications, text messages, and social media updates shatters stu…

Task by task

TaskClaude Fable 5Gemini 3.1 Pro Preview
Structured argument58
Essay plan910
Tighten flabby prose109
Hold a word count1010
Adapt for the reader1010
Introduction only109
Steelman the other side58
Cite honestly54
Fix the structure85
Formal to plain89
Conclusion that adds something109
Refuse to pad109

Full receipts: Claude Fable 5, Gemini 3.1 Pro Preview · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5

Questions people ask

Which is better for essay writing: Claude Fable 5 or Gemini 3.1 Pro Preview?

They tied at 83/100 on our essay writing suite — for this job, pick on price or the product you already use.

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.

More essay writing head-to-heads: Claude Fable 5 vs GPT-5.6 Sol · Gemini 3.1 Pro Preview vs GPT-5.6 Sol · Claude Fable 5 vs GPT-5.5 · Gemini 3.1 Pro Preview vs GPT-5.5 · Claude Fable 5 vs GPT-5.6 Luna · Gemini 3.1 Pro Preview vs GPT-5.6 Luna

Full ranking: Best AI for essay writing · model pages: Claude Fable 5, Gemini 3.1 Pro Preview