Claude
Anthropic
- great writing
- careful analysis
- long docs
- agentic coding
flagship: Opus 4.7
smaller plugin set; not for image/video gen
ChatGPT
OpenAI
- super versatile
- biggest ecosystem
- custom GPTs
- image + voice
GPT-5 series
check your plan's data settings
Gemini
Google
- Workspace native
- multimodal
- huge context
- generous free tier
Gemini 3 Pro
best if you live in Google tools
Grok
xAI
- real time from X
- strong coding
- affordable API
Grok 4
real time + personality may not suit formal use