GPT vs Claude vs Gemini — How the Free Tiers Actually Differ
"Can I use AI for free?" is hard to answer in one sentence because free access splits not just by company but within the same company and the same model family. This guide uses the data for the 12 models actually registered in the AI model comparison table to explain structurally why free tiers vary so unevenly by company and by model.
1. Free tier is a "per-model policy," not a "company policy"
The most common misconception is dividing free access at the company level — "OpenAI is paid, Google is free." That's not how it works. Open the source of the AI model comparison table and you'll see the 5 OpenAI models (GPT-4o, GPT-4o mini, GPT-4 Turbo, o1, o3-mini) and the 3 Anthropic models (Claude Opus, Sonnet, Haiku) are all set to free:false as paid-only, while among the 4 Google models free:true and free:false are mixed within one company. In other words, "free or not" is a policy decided per individual model, not per provider.
2. Same Gemini — why is only one model paid?
Of the 4 Google Gemini models in the table, 3 — 1.5 Pro, 1.5 Flash, 2.0 Flash — have a free API tier, but the remaining one, Gemini 2.0 Pro, is marked as paid-only with no free tier. Even in the same "2.0" generation and the same Google brand, only the Pro tier is left out of the free tier because free tiers are generally designed for "lightweight experimentation and prototyping." The Flash line has low speed/cost, so opening it for free puts little load on servers, but the top-tier Pro model supporting a 2M-token context has a high compute cost per single request, making it hard to offer for free. The intuition "same brand = same terms" breaks here.
| Model | Provider | Free tier | Input price ($/1M) |
|---|---|---|---|
| Gemini 1.5 Pro | Yes | $3.50 | |
| Gemini 1.5 Flash | Yes | $0.075 | |
| Gemini 2.0 Flash | Yes | $0.10 | |
| Gemini 2.0 Pro | No | $2.50 | |
| GPT-4o / entire Claude lineup | OpenAI / Anthropic | No | $0.15–$15.00 |
3. Why the OpenAI and Anthropic lineups are entirely paid
By the table, all 8 OpenAI and Anthropic models are free:false without exception. Instead, the two companies provide free usage through the chat web apps (ChatGPT, Claude.ai), not the API. It's important that "free API calls" and "free chat conversations on the web" are completely different tracks. This tool's table covers only API pricing, so your "but I'm using it fine for free?" experience in web chat can look contradictory next to the paid mark in the table. A developer wiring the API into their own service and an ordinary user asking questions in a chat window need to judge "free or not" by entirely different criteria.
4. The hidden cost of a free tier: request limits
Having a free tier doesn't mean "unlimited and free." Gemini free tiers generally carry caps like requests per minute (RPM) and requests per day (RPD), and exceeding them gets requests rejected or automatically switched to paid billing. That the table's note column marks Gemini 1.5 Flash as "Ultra-fast" and 2.0 Flash as "Next-gen fast" ties into the context that these two models, with their light compute cost, are practical to use even within a free tier's request limits. By contrast, 1.5 Pro, even with a free tier, often has a lower cap, making it better suited for testing than production.
5. Cautions when checking this data
The AI model comparison table itself states at the bottom of the page that "AI prices change often, so it's safest to re-verify the latest figures on each provider's official page." Free tier policies and request limits are items each company adjusts without notice, so the 12-model lineup and prices in this table are just a snapshot. Take the structural pattern this guide covers — "same Gemini, but only Pro is paid" — as reference, but always re-verify the specific price and limit numbers against the provider's own source before deciding on a contract or budget.
Frequently Asked Questions
Q. Exactly how many models can be used for free?
A. Of the 12 models in the comparison table, only 3 — Gemini 1.5 Pro, 1.5 Flash, and 2.0 Flash — offer a free API tier. The other 9 (5 OpenAI, 3 Anthropic, 1 Gemini 2.0 Pro) are paid-only on an API basis.
Q. Why, in the end, is only Gemini 2.0 Pro paid within the same Gemini family?
A. There's no single officially announced reason, but across the industry free tiers tend to concentrate on lightweight, low-compute-cost models (the Flash line), while top-tier large-context models (Pro) tend to be paid-only because of server cost.
Q. Is using ChatGPT or Claude.ai for free the same as an API free tier?
A. No. The free usage of chat web apps like ChatGPT and Claude.ai is a separate policy from API free tiers. This comparison table covers only API pricing, so the free experience you feel in web chat can differ from the paid mark in the table.
Q. Do free tiers have usage limits?
A. Yes. They generally have per-minute and per-day request caps, and exceeding them gets requests rejected or automatically switched to paid billing. Handling real service traffic usually requires moving to a paid plan eventually.