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Side-by-side comparisons built from official documentation, pricing pages and published benchmarks. Each page shows when it was last checked and what changed.

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ChatGPT vs Perplexity (October 2026): plans, prices, search, models and which to pickPerplexity for cited research; ChatGPT for files and codeChecked Oct 23 ChatGPT vs Microsoft Copilot (October 2026): plans, prices, models, Microsoft 365 integration and which to pickCopilot if you have Microsoft 365; ChatGPT Plus for CodexChecked Oct 23 GPT-6 Astra vs GPT-6.1 Sol vs GPT-6 Luna: what each OpenAI model is for, prices, limits and which to use (October 2026)6.1 Sol for most work; Astra for hardest; Luna for volumeChecked Oct 23 TorchTPU vs TorchNeuron: running PyTorch on Google TPUs and AWS Trainium compared (October 2026)TorchNeuron for Trn2/Trn3; TorchTPU to leave PyTorch/XLAChecked Oct 23 Claude vs ChatGPT vs Gemini (October 2026): plans, prices, models, limits and which to pickClaude or Gemini for long PDFs; AI Plus is cheapestChecked Oct 20 Gemini 4 Argon vs Claude Opus 5.5 vs GPT-6 (Sol/Astra): price, context, access and benchmarks (October 2026)Argon cheapest to Nov 30; Opus 5.5 for agentic codingChecked Oct 14 ChatGPT vs Gemini for research: deep research, long documents, prices and privacy comparedGemini for long PDFs; ChatGPT for web research reportsChecked Oct 9 ChatGPT vs Claude for coding and writing: plans, models and limits comparedClaude for long writing; same $20 tier for light codingChecked Oct 9 Claude Code vs Codex vs Cursor: features, prices and limits compared (October 2026)Codex on ChatGPT; Claude Code on Claude; Cursor multi-modelChecked Oct 9 Frontier APIs vs open models: what they really costAPIs to start; open models for control or huge volumeChecked Oct 8

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