Why AI writing tools have dominated the market
In the last two years, AI writing tools have transformed from experimental toys into everyday work tools. According to data from OpenAI, over 500 million people use ChatGPT monthly. For Czech users, it is key that most of these platforms support Czech at least at the level of text generation, although some advanced features remain limited to English.
The main advantage of AI writing is time savings. A marketing specialist, copywriter, or student can create a first draft of text in minutes instead of hours with a quality tool. But it is important to know how to choose the right tool for a specific purpose — each has different strengths.
ChatGPT: Universal worker with the widest range of features
ChatGPT from OpenAI remains the most well-known AI writing tool. In 2026 it offers several models: GPT-5.3 Instant for common tasks, GPT-5.5 Thinking for more complex analyses, and GPT-5.5 Pro for demanding work with long texts.
ChatGPT handles writing blog posts, style editing, translations, and generating creative ideas. It handles Czech solidly, although it occasionally creates calques from English or less natural phrases. For common work emails and marketing texts, however, it is fully sufficient.
Pricing plans in 2026:
- Free: Free with limited access to GPT-5.3
- Go: Approx. 5–10 USD monthly (extended limits, may contain ads)
- Plus: 20 USD monthly (access to GPT-5.5 Thinking, deeper research, agent mode)
- Pro: From 200 USD monthly (5× to 20× higher limits, GPT-5.5 Pro)
- Business: 25 USD per user monthly (team features, app integrations)
For Czech companies, the option of data residency in the EU, which the Enterprise plan offers, is interesting.
Claude: The best reading AI for long texts
Claude from Anthropic has gained a reputation as a tool that best understands context and can work with very long documents. Models Opus 4.7, Sonnet 4.6, and Haiku 4.5 cover the spectrum from the most demanding tasks to quick answers.
Claude excels in analytical writing, editing academic texts, and working with attached files. It can analyze PDFs, Word documents, and tables, then create structured text based on them. For Czech users, it is important that the platform is fully available in the Czech Republic and supports the Czech language, albeit with a slight delay compared to English.
Pricing plans:
- Free: Free with limited requests
- Pro: 17–20 USD monthly (more usage, Claude Code, Office integration)
- Max: From 100 USD monthly (5× to 20× higher limits)
- Team: 20–25 USD per user monthly (SSO, central billing)
Anthropic places great emphasis on security. For business plans, data is not used for model training and the platform meets GDPR requirements.
Gemini: Google's connection with search and documents
Google Gemini differs with deep integration with the Google ecosystem. For Google Workspace users, it represents a natural choice — Gemini can work directly in Google Docs, Gmail, and Sheets.
Model Gemini 2.5 Pro offers in 2026 a context window of up to 2 million tokens, which means it can process several hundred pages of text at once. For Czech users, the advantage is strong Czech language support and access to current information from the web via Google Search.
Pricing plans:
- Free: Free with limitations
- Gemini Advanced: 20 USD monthly (access to the latest models, Workspace integration)
- Workspace integration: According to Google Workspace plan
Other specialized tools
Jasper AI
Jasper is focused primarily on marketing teams. It offers templates for ad texts, social media posts, and email campaigns. Prices start at approx. 49 USD monthly per user. For the Czech market, however, Czech language support is more limited than with the big three.
Copy.ai
Copy.ai targets smaller companies and freelancers. It offers generation of short texts, product descriptions, and advertising slogans. The free plan allows 2,000 words monthly, the paid Pro plan costs 36 USD monthly. Czech is supported, but with less creativity than English.
Notion AI
For teams that already use Notion, Notion AI is a natural extension. It can summarize notes, rewrite texts, and generate content directly in work documents. It costs 10 USD monthly per user and works well with the Czech language too.
Grammarly
Although Grammarly primarily serves for grammar correction, its AI features can rewrite sentences, adjust text tone, and generate suggestions. The Premium plan costs approx. 12 USD monthly. For Czech, however, support is very weak — the tool is practically unusable outside of English.
How to choose the right tool
The choice depends on three factors: purpose of use, budget, and language.
For common writing and experimenting, free versions of ChatGPT or Claude suffice. If you need to work with long documents and analytical texts, Claude has the edge thanks to better context understanding. Google Workspace users will appreciate Gemini integration directly into documents and emails.
Marketing teams with higher budgets may consider Jasper, while freelancers and small companies often prefer Copy.ai for quick generation of short texts. For the Czech market, it is important to test the specific tool — Czech language support differs between platforms and may change with every model update.
Security and data protection
When working with company or sensitive texts, it is key to verify how the tool handles data. OpenAI and Anthropic offer in paid plans a guarantee that data will not be used for training. Google processes data within its standard terms. For organizations subject to strict regulations, it is appropriate to consider Enterprise plans with guaranteed data residency in the EU.
Conclusion
AI writing tools in 2026 offer solutions for every budget and purpose. ChatGPT dominates in versatility, Claude leads in analytical processing of long texts, and Gemini benefits from integration with the Google ecosystem. For Czech users, the good news is that all three platforms support Czech and are fully available on the local market. The key to success is not to find the "best" tool, but the one that best matches your specific needs.
Can I use AI writing tools for commercial texts without copyright concerns?
AI-generated texts are mostly not protected by copyright in the sense of a traditional work, but terms of use differ by platform. OpenAI and Anthropic grant users rights to generated content, but always read the current terms. In the EU, AI must not violate third-party rights — for example, copying protected passages from training data.
What is the difference between GPT-5.3 and GPT-5.5 Thinking in ChatGPT?
GPT-5.3 Instant is optimized for speed and common tasks. GPT-5.5 Thinking uses more advanced chain reasoning — the model "thinks" step by step before answering. This improves quality for complex analytical or creative tasks, but the answer takes longer.
Are AI writing tools available offline too?
Most popular tools require an internet connection because models run on cloud servers. Exceptions are some open-source models like Llama from Meta or Mistral, which can be run locally on a powerful computer. For the average user, however, cloud solutions remain more practical.