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Best AI research stack right now

For analysts, writers, founders doing market research. · Updated May 1, 2026

Research is a different problem from chat. You need provenance, fresh data, and the ability to compare sources fast. These picks are weighted toward sourcing quality and answer reliability.

  1. #1

    Perplexity Pro

    Best balance of source quality and speed for general research.

    Perplexity's sourcing is still the most readable: every claim has a clickable source, and Spaces let you constrain searches to trusted domains. The 2026 Pro tier added shared system prompts for teams. Use it as your default search starting point.

    See Perplexity Pro
  2. #2

    Gemini 2.5 Pro (with Deep Research)

    Cheapest serious option for multi-source synthesis, especially with PDFs.

    Gemini 2.5 Pro is now the best-value model for document-heavy research. Deep Research mode produces multi-source reports that hold up to scrutiny. Pricing held while quality increased — best dollar-for-dollar choice if your workflow involves uploading PDFs or images.

    See Gemini 2.5 Pro (with Deep Research)
  3. #3

    ChatGPT (deep research)

    When you need depth and don't mind waiting.

    ChatGPT's deep research produces longer, more thorough reports than Perplexity — but takes 10-30 minutes per query. Use this when the depth justifies the wait. Recent rate-limit cuts on Plus tier make this less appealing for daily use.

    Plus tier limits got cut in April. API access is more reliable.
    See ChatGPT (deep research)

Past picks

  • March 2026
    Was: ChatGPT #1, Perplexity #2, Gemini #3
    Why we changed: Reordered after OpenAI dropped Plus rate limits and Perplexity Spaces shipped. Perplexity is now the most reliable daily driver; ChatGPT is reserved for the cases where its depth justifies the wait.

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