AI Writing Assistants 5 Years In: Which Held Up

I tracked output, accuracy, and cost across two major AI writing tools for five years. Both got better. One got dramatically better. The pricing trajectory matters more than the feature list.

In 2021 I started using two AI writing assistants for client work — call them Tool A (an early-mover that pivoted hard) and Tool B (a research-heavy late entrant). Five years of usage data later, the practical comparison is more interesting than the marketing claims.

Output quality over time

Both tools improved substantially. Tool A got better at speed and short-form. Tool B got better at coherence over long-form. The gap between them was small in 2021 and is large in 2026 — in opposite directions. Pick the tool that matches what you write most.

Factual accuracy

Tool A hallucinated 8-12% of the time on factual claims in 2021, 3-4% in 2024, 1-2% now. Tool B was at 6% in 2021 and is at 0.5-1% now. Both are at the point where you can use them for first drafts; neither is at the point where you can use them for final copy without checking.

Cost trajectory

Tool A: $20/month in 2021, $39/month in 2026. The features grew faster than the price.

Tool B: $40/month in 2021, $25/month in 2026 (after restructuring). The pricing pressure from open-source models drove this.

Five-year total: Tool A $1,800, Tool B $1,950. Functionally similar despite the trajectories.

What I use now

Tool B for any first draft. Tool A for editing and rewriting passes. The two-tool workflow is the version I'd recommend if you're paying — neither alone is sufficient if writing is your job.

The workflow that survived

Voice memo first — talk through what I want to say for 5-10 minutes. AI transcribes and structures. I write the prose myself, with AI as a sentence-rewriting partner. This is the version that produces work that doesn't sound like AI. The AI-only workflow produces output that sounds increasingly homogeneous as more people use it.

The infrastructure that supports the work

A mechanical keyboard for the actual writing hours. noise cancelling headphones. A standing desk. Deep Work by Cal Newport is the book on this; if you're using AI to skip the focus work entirely, you're using it wrong.

What I'd skip

Any tool that markets itself as "AI for SEO at scale." Google's helpful-content updates eat these. The strategy that worked in 2023 is actively penalized in 2026.

Tools that promise "100% undetectable" AI content. The arms race between detectors and obfuscators is a waste of your money and dignity.

The honest answer

AI writing tools are now an upgrade for everyone who already writes well. They're a downgrade for anyone hoping to skip the writing skill entirely. The cheap version of the same lesson: read Deep Work, then use AI as a writing partner, not a writing replacement.