Good news: you don't need a subscription to try AI. Bad news: "free" usually means "free up until the point it gets interesting." Here's the honest breakdown — with concrete limits instead of marketing language.
One note upfront: most providers deliberately don't publish their exact limits. What's here is partly official, partly from community testing. Numbers can change. Last checked: May 2026.
ChatGPT — the household name
What it is: Probably the most well-known AI tool out there, made by OpenAI.
Free: Yes — GPT-4o (or whatever the current main model is) is available on the free plan. After roughly 10–15 messages per 5-hour rolling window, you get silently downgraded to a weaker model. OpenAI doesn't publish the exact number — you usually notice it through declining answer quality.
Image generation is capped at about 2–3 images per 24 hours (no official limit, from community testing). After that: wait or pay.
Good for: Writing, summarizing, brainstorming, explaining code.
Honestly: For occasional use, free is fine. Heavy daily users will hit the walls quickly — often without a clear error message.
Link: chat.openai.com
Claude — the thoughtful one
What it is: AI from Anthropic, known for handling longer and more structured texts better than most competitors.
Free: Yes — claude.ai gives free access to the current Claude Sonnet. The limit is token-based, not message-based: a quick "hi" costs little, a long analysis with an uploaded document costs a lot. Typical is 15–40 messages per 5-hour rolling window for normal usage — but Anthropic gives no official number. There's no display showing how much budget remains.
Good for: Long-form writing, analyzing documents, detailed explanations that don't stay surface-level.
Honestly: Often calmer and more precise than ChatGPT — less likely to just tell you what you want to hear. The rolling 5-hour window instead of a hard daily limit is a genuine advantage: you wait a bit rather than having to wait until tomorrow.
Link: claude.ai
Gemini — the pleasant surprise
What it is: Google's AI assistant, formerly known as Bard.
Free: Yes — and here Gemini is genuinely the most generous option in the comparison. Text conversations in the browser are practically unlimited, with no hard daily message cap for normal chatting. Only compute-heavy features have restrictions: Deep Research is capped at about 5 reports per month, image generation has a separate quota.
Good for: Google Workspace integration (Docs, Gmail, Sheets), current information via Google Search, longer sessions without interruption.
Honestly: As a standalone chat tool, Gemini is solidly average. But the absence of a message limit is a real advantage for beginners who just want to get started without watching a quota.
Link: gemini.google.com
Microsoft Copilot — everywhere and nowhere
What it is: Microsoft's AI layer, powered by GPT-4. Built into Windows, Edge, and Microsoft 365.
Free: Yes — text conversations are unlimited. Image generation gets 15 "boosts" per day (fast generation); after that it still works but noticeably slower. Boosts reset daily.
Good for: AI-enhanced search if you're already using Windows/Edge; Office documents (with a Microsoft 365 subscription).
Honestly: Copilot is a little bit everywhere but nowhere truly impressive. Useful if you already have it in front of you. Free image generation is a nice extra.
Link: copilot.microsoft.com
Perplexity — AI search
What it is: A search engine with AI-generated answers that actually cites its sources.
Free: Standard searches are unlimited. The limit applies to "Pro Search" (deeper analysis with more powerful models): roughly 5 Pro Searches per day — Perplexity doesn't publish the exact number, but community testing consistently lands on this figure.
Good for: Research, especially when you want to see where information comes from. Better than Google for complex questions — because answers are summarized and sourced.
Honestly: For research, one of the most useful free tools available. Hallucinates less than pure chat AIs because it grounds answers in real sources. The 5 Pro Searches per day is enough for occasional use.
Link: perplexity.ai
Le Chat / Mistral — the European option
What it is: AI assistant from French company Mistral AI. European, GDPR-compliant, no data handed over to US corporations.
Free: Yes — Le Chat is free to use. Mistral doesn't publish exact limits officially; from the pricing structure you can infer roughly 25 messages per day on the mid-tier models. The "Think" mode for deeper reasoning is capped at 1/30th of the Pro rate — use it sparingly.
Good for: Anyone who wants to stay with European providers. Surprisingly capable.
Honestly: Less well-known, but a legitimate alternative — especially if data privacy matters. No marketing hype, just a solid product.
Link: chat.mistral.ai
OpenRouter — all models, one access point
What it is: Not a model of its own, but an aggregator: you get one API key and can access 200+ models from OpenAI, Anthropic, Google, Meta and others. More technical, but more flexible.
Free: Yes — roughly 20–30 models are permanently free (tagged :free), including strong open-source models like Llama 3.3 70B, DeepSeek, or Qwen3. The rate limit: 50 requests per day without any credit balance, 1,000 requests per day after loading at least €10 once. These are officially published numbers.
Important: On the free tier, requests are used for training according to OpenRouter's terms. If you want data privacy, you need a paid account — more in the OpenRouter article.
Good for: Developers, technically curious users, anyone who wants to compare different models.
Honestly: Not a starting point for beginners — you need API knowledge. But for those who want to build or test, OpenRouter is gold.
Quick comparison
| Tool | Free limit (approx.) | Strength | Weakness |
|---|---|---|---|
| ChatGPT | ~10–15 msgs/5h, ~2–3 images/day | Versatile | Limits not published |
| Claude | ~15–40 msgs/5h (token-based) | Long texts | No quota display |
| Gemini | Text unlimited, 5 Deep Research/month | No message cap | Average as chat tool |
| Copilot | Text unlimited, 15 image boosts/day | Windows/Edge | Nothing exciting |
| Perplexity | Standard unlimited, ~5 Pro/day | Research with sources | Not a general tool |
| Le Chat | ~25 msgs/day | Privacy, EU | Less well-known |
| OpenRouter | 50–1,000 free requests/day | Model selection | API, not for beginners |
All figures approximate, as of May 2026. Providers change their limits often without notice.
My advice: try two or three of them. It costs nothing — except a bit of your time. And if you find yourself using one daily and hitting the limits: that's when to consider whether a subscription is worth it.
Next up: What even is a prompt — and why does the wording matter so much?