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Quick Comparison

Tool Maker Rating Price Best For
ChatGPT (GPT-4o/5) OpenAI ⭐⭐⭐⭐ 4.4 Free / $20/mo Most popular, easiest to start with
Claude (Sonnet 4/Opus) Anthropic ⭐⭐⭐⭐⭐ 4.6 Free / $20/mo Best for long text and deep analysis
Gemini Google ⭐⭐⭐⭐ 4.2 Free / $20/mo Best tied into Google Workspace
Microsoft Copilot Microsoft ⭐⭐⭐⭐ 4.0 Free / $30/mo Best built into Windows and Office
Perplexity Perplexity AI ⭐⭐⭐⭐ 4.3 Free / $20/mo Best AI search engine for research
DeepSeek DeepSeek ⭐⭐⭐⭐ 4.1 Free Best free AI with strong reasoning

In-Depth Reviews

More chat assistant reviews coming soon. Perplexity vs ChatGPT deep-dive is next.