📖 The AI Tool Bible

GPT-4o vs Lex

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

 
GPT-4o
Writing
Lex
Writing
TaglineOpenAI's multimodal flagship behind ChatGPT.Google Docs-style writing app with an LLM sidekick wired into every sentence.
CategoryWritingWriting
PricingFreemium· Free tier; Plus $20/mo; Pro $200/moFreemium· Free tier; Lex Pro paid (price not public); Teams add-on
ModelGPT-4oMulti-model (GPT-4.1, Claude)
Editorial score9.4 / 10—
Use cases
general writingsummarizationvisionvoice mode
long-form draftingeditorial feedbackcollaborative writingbrainstormingai rewriting
Pros
  • Strong all-rounder
  • Voice mode is uncannily good
  • Huge ecosystem & plugins
  • Available in ChatGPT, API, Copilot
  • Familiar Google Docs-style editor with AI woven in, not bolted on
  • Multi-model access (GPT-4.1, Claude) on the Pro plan
  • Real-time collaboration, comments, versioning, and publish links
  • Adopted by serious newsrooms and universities, not just hobbyists
Cons
  • Style can be generic without nudging
  • Hallucinates citations occasionally
  • Context smaller than Claude on long docs
  • Pricing is not transparently published on the site
  • No public API or self-hosted option
  • Track Changes still listed as 'coming soon'
  • Thin disclosure about which model handles which task
Websitechatgpt.comlex.page
Pick GPT-4o if
  • ✅ Strong all-rounder
  • ✅ Voice mode is uncannily good
  • ✅ Huge ecosystem & plugins
  • ✅ Available in ChatGPT, API, Copilot
Pick Lex if
  • ✅ Familiar Google Docs-style editor with AI woven in, not bolted on
  • ✅ Multi-model access (GPT-4.1, Claude) on the Pro plan
  • ✅ Real-time collaboration, comments, versioning, and publish links
  • ✅ Adopted by serious newsrooms and universities, not just hobbyists
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