Model comparisons
How the major models and assistants compare on the things that decide which one you use: accuracy, price, limits and features. Every comparison cites its sources.
Claude Haiku vs Sonnet vs Opus
Claude Haiku, Sonnet and Opus 5.5 compared: price, speed, which plans include each, where Fable fits above them, and a quick test to pick the right model.
Claude Pro vs ChatGPT Plus
Claude Pro vs ChatGPT Plus, line by line: models, usage limits, Research and deep research, files, what you lose with each, and when Max or Pro is worth it.
Claude vs ChatGPT
Claude vs ChatGPT on what matters at work: which is more accurate, what each plan costs, which features you get, and how to test both on your own questions.
Claude vs ChatGPT for data
Claude vs ChatGPT for data analysis: file limits, code execution, what the benchmarks show, where metric definitions trip both up, and a test to run on each.
Claude vs ChatGPT for research
Claude Research vs ChatGPT deep research: how each works, what the citation studies tested (and didn't), which to use for which job, and how to check a report.
Claude vs ChatGPT vs Gemini
Claude, ChatGPT and Gemini compared on accuracy, plans and everyday work after their autumn 2026 launches, with the scoreboards that disagree and a test to run.
Claude vs Copilot
Claude vs Microsoft 365 Copilot for work: what each plan costs, why Copilot can now run Claude, Excel and data analysis, connectors, and how to check either.
Claude vs Gemini
Claude vs Gemini after Opus 5.5 and Gemini 4 Argon: which gets more right, where they tie, what each plan costs and how to test both on your own documents.
Claude vs Perplexity
Claude vs Perplexity: an assistant for your own documents and data against a search engine that cites everything. Plans, models, accuracy evidence and a test.
Gemini vs ChatGPT
Google Gemini vs ChatGPT after Gemini 4 Argon: what each plan costs, which scores higher on independent indexes, and a quick test to run on your own work.
Perplexity Pro vs ChatGPT Plus
Perplexity Pro vs ChatGPT Plus: what $17 and $20 a month buy in models, limits, research and tools, why paying more didn't buy accuracy, and how to test both.
Perplexity vs ChatGPT
Perplexity vs ChatGPT: an answer engine that cites everything against an assistant that does the work. Accuracy studies, plans, models and a two-minute check.