Compare AI tools

	Claude S	Perplexity S	OpenRouter S	Aider A
Tagline	Anthropic's flagship — best reasoning + longest useful context.	AI search done right. Cited answers, not chat theater.	One API, every model. Pay-as-you-go, no subscriptions.	Terminal-based AI pair programmer. Git-aware, model-flexible.
Category	Chatbots	Research	Dev Platform	Coding
Pricing	Free + $20/mo Pro + team/enterprise	Free + $20/mo Pro	Pay per token — model-dependent	Free (open source) + whatever API you use
Best for	Long writing, code, careful thinking, documents over 50 pages.	Replacing Google for any question where you want a cited answer in seconds.	Developers experimenting across models. Apps that want fallback logic.	Developers who want open-source tooling with full control.
Strengths	Best-in-class writing + nuanced reasoning 1M context on Opus Artifacts for code/docs Lowest hallucination rate in my testing	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context	300+ models from one endpoint Automatic fallbacks between providers No subscription — just pay what you use	Works in any terminal Auto-commits changes with meaningful messages Works with any model (Claude, GPT, local) Minimal learning curve
Weaknesses	Image generation is weak No native web search on all tiers	Not a general chatbot Answers can be shallow on complex topics	Slight markup over direct API Some provider features not exposed	Terminal-only Less agentic than Claude Code Setup on Windows is fiddly
Kai's verdict	S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.	S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.	S-tier for model-shopping. I use this for every prototype before committing.	A-tier. The right answer if you want open-source + terminal-native + model-agnostic.
Link	Open →	Open →	Open →	Open →