AI Writing Tools Benchmark 2026: Quality, Speed, and Cost Tested on 50 Prompts
We benchmarked 8 AI writing tools on 50 real prompts across 5 content types. Measured writing quality (human-rated), generation speed, and cost per 1,000 words. Claude Sonnet 4 scored highest on quality (9/10). Ivern's multi-agent approach scored best on depth and research accuracy. Full results with specific output examples.