AI Blog Writer Benchmark 2026: We Tested 8 Tools on 20 Real Blog Posts
We ran 20 identical blog post prompts through 8 AI writing tools -- ChatGPT, Claude, Jasper, Copy.ai, Writesonic, Gemini, Notion AI, and Ivern -- and scored every output on SEO structure, readability, factual accuracy, and engagement potential. Claude + Ivern scored highest (8.7/10 overall). Full data, output samples, and cost analysis ($0.05--$3.00 per post).