How to compare AI assistants for your own work: a simple 5-task test
Search for “best AI assistant” and you will find dozens of rankings, most of them out of date within weeks. AI tools change their models, prices and limits constantly, and the best tool for a student writing essays is not always the best for a freelancer answering clients. Instead of trusting a ranking, this guide shows you how to run a fair test on your own tasks in about an hour, so the answer is based on your work.
Why rankings mislead
There are three problems. First, tools change quickly, so a ranking can be wrong a month later. Second, rankings often test tasks that are not yours: a coding benchmark tells you little about writing a polite late-payment email. Third, some comparison sites earn a commission when you sign up, which can bias them. Whatever you read, check each tool’s official website for current prices, limits and features before you decide.
Step 1: Choose the tools to test
Pick two to four assistants. Popular options include ChatGPT, Claude, Google Gemini and Microsoft Copilot, and there are others. Start with the free version of each. If you plan to pay later, you can test the paid plan afterwards. Open each one in its own browser tab so you can switch quickly.
Step 2: Pick five real tasks
Choose tasks you actually do in a normal week. For example: rewrite a messy paragraph, summarise a long text, draft a polite email, explain a hard topic simply, and find mistakes in your own work. Write each task down as a prompt. Using identical words in every tool is what makes the test fair.
Step 3: Run the same prompt in every tool
Paste the exact same prompt and input into each assistant, one task at a time. Do not edit the prompt between tools, and do not keep regenerating until an answer looks good. Save each answer in a document labelled with the tool name and the task number.
Step 4: Score each answer
Score every answer from 1 to 5 on these four questions:
- Accuracy: did it keep my facts correct, or invent things?
- Following instructions: did it respect the word limit and the format I asked for?
- Tone: does it sound like something I would actually send?
- Usefulness: how much editing would it need before I could use it?
Add up the scores for each tool. Do not skip the accuracy check. Re-read the answer against your source text, because fluent writing can hide invented details.
Step 5: Check the practical points
Scores are not everything. Also compare:
- Free limits: how many messages or files can you use per day or every few hours?
- Privacy: can you stop your chats being used for training, and where is that setting?
- Language support: if you write in Urdu or another language, test a task in that language, because quality can differ a lot.
- Files and images: does it handle the documents you work with?
- Sources: can it show where information came from when you need to verify it?
- Phone app: will you use it away from your desk?
- Price: what does the paid plan cost in your currency, and what do you actually gain from it?
Step 6: Decide, then retest every few months
Pick the tool with the best total, or two tools if each wins on different tasks. Many people use more than one. Write down the date and your scores. Because tools change fast, repeat a shorter version of the test every three or four months, especially before paying for a yearly plan.
Common mistakes
Testing with one easy prompt, changing the wording between tools, judging by how confident an answer sounds, ignoring privacy settings, and paying for a yearly plan before testing.
Common questions
Is a paid plan worth it? Only if you often hit the free limits or need a feature the free version lacks. Test the free version first.
What about AI agents? Agents are tools that take several steps on their own, such as browsing or filling in forms. Mistakes can build up across steps, so they need closer checking. Start with a chat assistant, and use an agent only for tasks you are willing to review carefully.
Which tool is best overall? There is no single answer, which is why this site recommends testing on your own work.