AI Writing Tools in 2026: What ChatGPT, Claude and Grammarly Actually Cost

01 Event

“AI writing tool” now describes several very different products. A grammar-first assistant, a general AI chatbot, and a long-context research assistant may all help produce better writing, but they solve different parts of the workflow.

That matters because subscription prices alone do not tell you which tool replaces the most work. A person who mainly needs sentence-level rewriting may value Grammarly differently from someone who drafts reports with ChatGPT or develops long documents with Claude.

This comparison focuses on current published pricing and product positioning from OpenAI, Anthropic and Grammarly as of September 2026. It does not claim one model is universally “best,” because writing quality depends heavily on task, prompt, source material and review.

02 What Changed?

OpenAI’s help center currently lists ChatGPT Plus at $20 per month. The paid plan expands model and tool access beyond Free and includes features such as image generation, file uploads and analysis, deep research where available, advanced reasoning, and higher usage limits.

Anthropic’s current plan guidance lists Claude Pro at $20 per month, with Max 5x at $100 and Max 20x at $200. Anthropic describes Pro as the regular-use tier and Max as higher-capacity options for users who work with Claude more heavily throughout the day.

Grammarly has a different model. Its current support page lists Grammarly Pro at $30 per month, $60 per quarter, or $144 per year, equivalent to $12 per month when paid annually. Its plan page says Pro includes full-sentence rewrites, tone adjustment, plagiarism and AI-generated-text detection, and 2,000 generative AI prompts per member per month.

The change is less about three companies selling the same “AI writer” and more about writing functionality being bundled into different productivity systems.

03 Why It Matters

If you choose by headline price alone, you may pay for a tool whose strongest features do not match your bottleneck.

For a writer who already knows what to say but wants faster correction and tone control, a writing-native tool can reduce editing friction. For someone who starts with a blank page and needs outlining, research synthesis, document analysis and iterative drafting, a general AI assistant may replace more separate steps.

The value test should be:

Monthly value = time saved on tasks you would otherwise do − extra review time created by AI errors − subscription cost

The review term matters. AI-generated copy still needs factual verification, judgment and editing. A fast first draft that introduces unsupported claims can create more work rather than less.

That is why Earnyx’s broader AI tool value guide recommends measuring recurring use rather than subscribing because a feature looks impressive during a trial.

04 What It Means for You

Choose based on the stage of writing you need help with:

• Drafting and synthesis: General assistants such as ChatGPT and Claude are built for broader conversational workflows, document analysis and iterative generation.
• Sentence-level polish: Grammarly remains tightly integrated around grammar, tone, rewriting and writing assistance across applications.
• Research-heavy writing: Check whether the product can work with uploaded files, search current sources, and show citations or source references appropriate to your task.
• High-volume use: Usage limits matter as much as the subscription price. Anthropic explicitly says usage depends on conversation length, complexity, model and features; OpenAI similarly notes that paid plans can still have limits.
• Team work: Consumer prices should not be used as enterprise budget assumptions. Team, business and enterprise plans have different controls and pricing.

Do not subscribe to three overlapping writing tools automatically. Test whether one paid product plus free features in another covers the actual workflow. Our AI subscription-overload article explains why several individually reasonable subscriptions can still become a poor combined purchase.

05 Numbers + Context

Tool	Current individual paid price	Officially stated writing-relevant features
ChatGPT Plus	$20/month	Higher model limits, advanced reasoning, file uploads/analysis, deep research where available, broader tool access
Claude Pro	$20/month	Higher capacity than Free; access to Claude’s broader writing, analysis and document workflows
Grammarly Pro	$30 monthly, or $144/year ($12/month equivalent)	Full-sentence rewrites, tone adjustment, plagiarism/AI-text detection, 2,000 AI prompts per month

The prices are not directly equivalent products. Grammarly’s annual price is lower than its monthly billing rate, but committing for a year only saves money if you use it long enough. Earnyx has a separate guide to when annual billing is not actually the cheapest decision.

Also note that ChatGPT Plus and Claude Pro are general AI subscriptions, not writing-only subscriptions. Their value may come from coding, analysis, research or file work in addition to writing. That can make the same $20 more valuable for one user and unnecessary for another.

06 Earnyx Takeaway

There is no single “AI writing tool” category anymore. The products overlap, but the economics are different.

If your main problem is grammar, tone and sentence rewriting across everyday apps, Grammarly’s writing-native workflow may be the better fit. If you need a flexible assistant that can outline, analyze source files, restructure long drafts and help across other tasks, ChatGPT or Claude may replace more separate tools.

The right purchase is the one that removes a recurring bottleneck. Pay for the workflow you repeatedly use, not for the longest feature list.

Sources: OpenAI — What is ChatGPT Plus?; Anthropic — Choosing a Claude plan; Grammarly — Pro pricing; Grammarly — Plan features.