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Best AI for… / writing

Best AI for essays and academic writing

Essays, assignments and academic writing.

Best overall, and best for $25 a month or less

Claude Opus 5.5

Get it with Claude Pro, $20 a month

Top of 14 models for this task

Best free

Kimi K3

Get it with Kimi Free

4th of 14 models for this task

Based only on people's votes. The picks follow a fixed rule using the charts below and each app's plans.

Already paying for one? See what each plan gives you here
App and planPriceBest model on it for thisPosition
ChatGPT FreefreeGPT-5.6 Luna12th of 14
ChatGPT Go$8 a monthGPT-5.6 Luna12th of 14
ChatGPT Plus$20 a monthGPT-5.6 Sol5th of 14
ChatGPT Pro$100 a monthGPT-6 Astra
Called GPT-6 Pro in the app
9th of 14
Claude FreefreeClaude Sonnet 510th of 14
Claude Pro$20 a monthClaude Opus 5.51st of 14
Claude Max$100 a monthClaude Opus 5.51st of 14
Gemini FreefreeGemini 3.1 Pro
Limited use
7th of 14
Google AI Plus$4.99 a monthGemini 3.1 Pro
Twice the free plan's use
7th of 14
Google AI Pro$19.99 a monthGemini 3.8 Flash3rd of 14
Google AI Ultra$99.99 a monthGemini 3.8 Flash3rd of 14
Kimi FreefreeKimi K34th of 14
Kimi Moderato$19 a monthKimi K34th of 14

How the models compare

Every model we could score for essays and academic writing, combining the tests below.

Overall for essays and academic writing

Position on a combined score from 3 tests. The longer the bar, the further ahead · Higher is better

On the tests we have, Claude Opus 5.5 comes out on top, followed by Claude Fable 5.1 and Gemini 3.8 Flash.

Claude Opus 5.5 · Anthropic1st
Claude Fable 5.1 · Anthropic2nd
Gemini 3.8 Flash · Google DeepMind3rd
Kimi K3 · Moonshot AI4th
GPT-5.6 Sol · OpenAI5th
DeepSeek V4.1 Flash · DeepSeek6th
Gemini 3.1 Pro · Google DeepMind7th
Gemini 3.6 Flash · Google DeepMind8th
GPT-6 Astra · OpenAI9th
Claude Sonnet 5 · Anthropic10th
DeepSeek V4 Pro · DeepSeek11th
GPT-5.6 Luna · OpenAI12th
Gemini 3.5 Flash-Lite · Google DeepMind13th
Claude Haiku 4.5 · Anthropic14th

The evidence

People's votes on writing and language

Tests this task · People compared two anonymous answers to writing, editing and language questions. · Higher is better

Claude Opus 5.5 and Claude Fable 5.1 are neck and neck at the top, followed by Gemini 3.8 Flash and Gemini 3.1 Pro; Claude Fable 5.1 costs about 3 times as much.

Claude Opus 5.5 · Anthropic1st
Claude Fable 5.1 · Anthropic2nd
Gemini 3.8 Flash · Google DeepMind3rd
Gemini 3.1 Pro · Google DeepMind4th
Kimi K3 · Moonshot AI5th
Gemini 3.6 Flash · Google DeepMind6th
GPT-5.6 Sol · OpenAI7th
DeepSeek V4.1 Flash · DeepSeek8th
DeepSeek V4 Pro · DeepSeek9th
GPT-6 Astra · OpenAI10th
Claude Sonnet 5 · Anthropic11th
Gemini 3.5 Flash-Lite · Google DeepMind12th
GPT-5.6 Luna · OpenAI13th
Claude Haiku 4.5 · Anthropic14th
Source: LMArena · votes as of 25 Sept 2026

People's votes on following instructions

Tests a related skill · People compared two anonymous answers to requests with specific instructions. · Higher is better

Claude Opus 5.5 and Claude Fable 5.1 are neck and neck at the top, followed by Gemini 3.8 Flash and Kimi K3; Claude Fable 5.1 costs about 3 times as much.

Claude Opus 5.5 · Anthropic1st
Claude Fable 5.1 · Anthropic2nd
Gemini 3.8 Flash · Google DeepMind3rd
Kimi K3 · Moonshot AI4th
GPT-5.6 Sol · OpenAI5th
DeepSeek V4.1 Flash · DeepSeek6th
Gemini 3.6 Flash · Google DeepMind7th
Gemini 3.1 Pro · Google DeepMind8th
GPT-6 Astra · OpenAI9th
Claude Sonnet 5 · Anthropic10th
DeepSeek V4 Pro · DeepSeek11th
GPT-5.6 Luna · OpenAI12th
Gemini 3.5 Flash-Lite · Google DeepMind13th
Claude Haiku 4.5 · Anthropic14th
Source: LMArena · votes as of 25 Sept 2026

People's votes on expert questions

Tests a related skill · People compared two anonymous answers to questions needing expert knowledge. · Higher is better

Claude Opus 5.5 and Gemini 3.8 Flash are neck and neck at the top, followed by Claude Fable 5.1 and Kimi K3; Claude Opus 5.5 costs about 5 times as much.

Claude Opus 5.5 · Anthropic1st
Gemini 3.8 Flash · Google DeepMind2nd
Claude Fable 5.1 · Anthropic3rd
Kimi K3 · Moonshot AI4th
GPT-5.6 Sol · OpenAI5th
DeepSeek V4.1 Flash · DeepSeek6th
Claude Sonnet 5 · Anthropic7th
Gemini 3.6 Flash · Google DeepMind8th
GPT-6 Astra · OpenAI9th
Gemini 3.1 Pro · Google DeepMind10th
GPT-5.6 Luna · OpenAI11th
DeepSeek V4 Pro · DeepSeek12th
Claude Haiku 4.5 · Anthropic13th
Gemini 3.5 Flash-Lite · Google DeepMind14th
Source: LMArena · votes as of 25 Sept 2026

If you build with it

What the makers charge developers who use the models directly. Using an app? The plans above are what you pay.

Cost per 1,000 typical requests

List price, about 1,500 words in and 500 out per request · Lower is better

GPT-6 Luna is cheapest, followed by DeepSeek V4.1 Flash and GPT-5.6 Luna.

GPT-6 Luna · OpenAI$0.55
DeepSeek V4.1 Flash · DeepSeek$0.72
GPT-5.6 Luna · OpenAI$1.24
DeepSeek V4 Pro · DeepSeek$1.48
Gemini 3.5 Flash-Lite · Google DeepMind$2.35
Gemini 3.8 Flash · Google DeepMind$4.13
Gemini 3.6 Flash · Google DeepMind$4.13
Claude Haiku 4.5 · Anthropic$5.50
Claude Sonnet 5 · Anthropic$11
GPT-6 Sol · OpenAI$11
Gemini 3.1 Pro · Google DeepMind$12
Kimi K3 · Moonshot AI$17
GPT-5.6 Sol · OpenAI$22
Claude Opus 5.5 · Anthropic$22
GPT-6 Astra · OpenAI$55
Claude Fable 5.1 · Anthropic$55
Source: models.dev · MIT
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