Deep Research Agents Compared: Long-Form Report Generation
5 research tools compared on AiRecMark archive scores, five-dimension quality, published entry pricing and documented target fit.
ChatGPT leads this field with 90.9/100 — +2.4 pts over Gemini.
All figures below are derived from the AiRecMark deterministic five-dimension evaluation archives. Pricing quotes are taken verbatim from each vendor's published plans.
| Rank | Tool & Vendor | Quality / Perf / Usability | Score | Pricing | Best for | Spec |
|---|---|---|---|---|---|---|
| #1 | CH ChatGPTOpenAI |
93 86 94 |
90.9 | Free $0 · Plus $20 / mo · Pro $100 / mo | General Reasoning | Inspect |
| #2 | GE GeminiGoogle |
89 85 91 |
88.5 | Google AI Pro $19.99 / mo · Free tier | Users embedded in Google's ecosystem who want AI everywhere | Inspect |
| #3 | PE PerplexityPerplexity AI |
91 86 92 |
88.4 | Pro $20 / mo ($200 / yr) · Free tier available | Research Synthesis | Inspect |
| #4 | DE DeepSeekDeepSeek |
86 84 80 |
84.7 | API: flash from $0.15/1M in (cache-hit $0.003) | Cost-Efficient Reasoning at Scale | Inspect |
| #5 | GE GensparkMainFunc Inc. |
82 79 84 |
80.9 | Free (daily credits) · Plus $24.99/mo ($19.99 | All-in-one agent workspaces | Inspect |
Five-Dimension Matrix
| Dimension | ChatGPT | Gemini | Perplexity | DeepSeek | Genspark |
|---|---|---|---|---|---|
| Quality | 93 | 89 | 91 | 86 | 82 |
| Features | 94 | 88 | 88 | 80 | 80 |
| Usability | 94 | 91 | 92 | 80 | 84 |
| Performance | 86 | 85 | 86 | 84 | 79 |
| Value | 88 | 90 | 85 | 92 | 80 |
Choose By Fit
ChatGPT
OpenAI · 90.9/100Choose ChatGPT if you need general reasoning.
- Broadest general capability and multimodal coverage
- Most complete ecosystem and third-party integrations
Gemini
Google · 88.5/100Choose Gemini if you need users embedded in google's ecosystem who want ai everywhere.
- Generous free tier
- Deep Google Workspace and Android integration
Perplexity
Perplexity AI · 88.4/100Choose Perplexity if you need research synthesis.
- Citation-grounded answers, friendly to fact-checking
- Strong Deep Research long-form reports
DeepSeek
DeepSeek · 84.7/100Choose DeepSeek if you need cost-efficient reasoning at scale.
- Cache-hit input from $0.003/1M tokens
- Off-peak rates are half of peak
Genspark
MainFunc Inc. · 80.9/100Choose Genspark if you need all-in-one agent workspaces.
- One subscription covers frontier chat, image, video and audio models
- Full workspace: AI Slides, Sheets, Docs and Genspark Code agents
Deterministic Takeaway
ChatGPT tops the composite index at 90.9/100. Dimension leaders across the field — Quality: ChatGPT, Features: ChatGPT, Usability: ChatGPT, Performance: ChatGPT, Value: DeepSeek. Every ranking and dimension value on this page is drawn from the archive-recorded AiRecMark tool archives as of 2026-09-17 and can be traced back to the public tool profiles.
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2-tool head-to-head with archive-derived scores.