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Best AI for… / maths and science

Best AI for chemistry

Chemistry questions, including organic chemistry.

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

Gemini 3.8 Flash

Get it with Google AI Pro, $19.99 a month

Top of 11 models for this task

Best freeToo close to call

2nd and 3rd of 11 models for this task

Based on tests of this task. 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 Luna9th of 11
ChatGPT Go$8 a monthGPT-5.6 Luna9th of 11
ChatGPT Plus$20 a monthGPT-6 Astra
Only in ChatGPT's Work mode and Codex, not normal chat
5th of 11
ChatGPT Pro$100 a monthGPT-6 Astra
Called GPT-6 Pro in the app
5th of 11
Claude FreefreeClaude Sonnet 57th of 11
Claude Pro$20 a monthClaude Sonnet 5
Its main model, Claude Opus 5.5, is too new to score yet.
7th of 11
Claude Max$100 a monthClaude Sonnet 5
Its main model, Claude Opus 5.5, is too new to score yet.
7th of 11
Gemini FreefreeGemini 3.1 Pro
Limited use
3rd of 11
Google AI Plus$4.99 a monthGemini 3.1 Pro
Twice the free plan's use
3rd of 11
Google AI Pro$19.99 a monthGemini 3.8 Flash1st of 11
Google AI Ultra$99.99 a monthGemini 3.8 Flash1st of 11
Kimi FreefreeKimi K32nd of 11
Kimi Moderato$19 a monthKimi K32nd of 11

How the models compare

Every model we could score for chemistry, combining the tests below.

Overall for chemistry

Position on a combined score from 2 tests. The longer the bar, the further ahead · Higher is better

On the tests we have, Gemini 3.8 Flash comes out on top, followed by Kimi K3 and Gemini 3.1 Pro.

Gemini 3.8 Flash · Google DeepMind1st
Kimi K3 · Moonshot AI2nd
Gemini 3.1 Pro · Google DeepMind3rd
Gemini 3.6 Flash · Google DeepMind4th
GPT-6 Astra · OpenAI5th
GPT-5.6 Sol · OpenAI6th
Claude Sonnet 5 · Anthropic7th
DeepSeek V4 Pro · DeepSeek8th
GPT-5.6 Luna · OpenAI9th
Gemini 3.5 Flash-Lite · Google DeepMind10th
Claude Haiku 4.5 · Anthropic11th

The evidence

Graduate-level science questions

Tests this task · Biology, physics and chemistry questions written so they can't be answered by searching the web. · Higher is better

GPT-6 Astra and Gemini 3.8 Flash are neck and neck at the top, followed by Gemini 3.1 Pro and Gemini 3.6 Flash; GPT-6 Astra costs about 13 times as much.

GPT-6 Astra · OpenAI96%
Gemini 3.8 Flash · Google DeepMind95%
Gemini 3.1 Pro · Google DeepMind94%
Gemini 3.6 Flash · Google DeepMind94%
GPT-5.6 Sol · OpenAI93%
Kimi K3 · Moonshot AI93%
DeepSeek V4 Pro · DeepSeek92%
GPT-5.6 Luna · OpenAI92%
Claude Sonnet 5 · Anthropic91%
Gemini 3.5 Flash-Lite · Google DeepMind83%
Claude Haiku 4.5 · Anthropic60%
Source: NYU and others via Epoch AI · CC BY 4.0

People's votes on science questions

Tests this task · People compared two anonymous answers to questions in the life, physical and social sciences. · 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
Gemini 3.1 Pro · Google DeepMind5th
Gemini 3.6 Flash · Google DeepMind6th
DeepSeek V4.1 Flash · DeepSeek7th
Claude Sonnet 5 · Anthropic8th
DeepSeek V4 Pro · DeepSeek9th
GPT-6 Astra · OpenAI10th
GPT-5.6 Sol · OpenAI11th
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

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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