Artificial intelligence has gone from a niche research topic to something millions of people use every single day. But with so many companies, products, and model names being thrown around, it can be hard to know where to start. This guide breaks it all down by company, explains what each of their AI models does, and tells you what it will cost you to use them.
Think of each AI model like a different car. They all get you from point A to point B, but they differ in speed, price, comfort, and what they are best suited for. This guide helps you figure out which car fits your needs.
OpenAI
OpenAI is the company behind ChatGPT, which is probably the name you have heard most. Founded in 2015 and backed heavily by Microsoft, OpenAI is currently the most widely recognized AI company in the world. Their models are branded under the “GPT” and “o” naming families.
GPT-4o
This is OpenAI’s flagship everyday model. The “o” stands for “omni,” meaning it can handle text, images, and voice all in one. It is fast, capable, and what most people get when they open ChatGPT today. You can use it to write emails, summarize documents, explain concepts, write code, or just have a conversation.
o3 and o4-mini
These are OpenAI’s “reasoning” models. Where GPT-4o is fast and conversational, the o-series models slow down and think through problems step by step before answering. They are especially good at math, science, logic puzzles, and complex coding problems. The “mini” version is cheaper and faster but still smarter than a standard model on hard problems.
GPT-4.1
A more recent update to the GPT-4 line, tuned for following instructions precisely and handling very long documents. Good for professionals who need reliable, structured output.
| Plan | Cost | What You Get |
| Free | $0/month | Limited access to GPT-4o, no advanced reasoning models |
| ChatGPT Plus | $20/month | Full GPT-4o access, o3 and o4-mini, image generation,file uploads |
| ChatGPT Pro | $200/month | Unlimited use of all models including the mostpowerful reasoning options |
| API (pay per use) | Varies | For developers; roughly $2-$15 per million wordsprocessed depending on model |
Best for: General purpose use, writing, coding, image understanding, voice conversations. ChatGPT is the easiest entry point for most beginners.
Anthropic
Anthropic was founded in 2021 by former OpenAI researchers, including siblings Dario and Daniela Amodei. Their focus has always been on building AI that is safer and more predictable. Their AI assistant is called Claude, and their models are named after the Claude brand with numbered versions.
Claude Sonnet
The everyday workhorse model from Anthropic. It balances speed and intelligence well, making it the model most people interact with through Claude.ai. Great for writing, research, analysis, and back-and-forth conversation. It handles very long documents particularly well — you can paste in an entire book and ask questions about it.
Claude Opus
Anthropic’s most powerful model. Slower and more expensive than Sonnet, but noticeably better at complex reasoning, nuanced writing, and situations where you need the AI to really think something through carefully.
Claude Haiku
The smallest and fastest Claude model. Not as capable as Sonnet or Opus, but very cheap to run and responds almost instantly. Used mostly by developers building apps where speed matters more than depth.
| Plan | Cost | What You Get |
| Free | $0/month | Limited messages per day with Claude Sonnet |
| Claude Pro | $20/month | More messages, access to Opus, file and image uploads, Projects feature |
| Claude Max | $100-$200/month | Much higher usage limits for heavy users |
| API (pay per use) | Varies | For developers; roughly $3-$15 per million words depending on model |
Best for: Long document analysis, careful writing, research, and users who want an AI that tends to be more thoughtful and less likely to just tell you what you want to hear.
Google DeepMind
Google has been doing AI research for decades, but it took ChatGPT’s popularity to push them into releasing consumer-facing AI products aggressively. Their AI assistant is called Gemini, and it lives inside Google’s ecosystem — Gmail, Docs, Search, and more. DeepMind is their research arm, responsible for the underlying models.
Gemini 2.5 Flash
Google’s fast, efficient everyday model. It is excellent at tasks involving the web, since it is deeply integrated with Google Search. If you want an AI that can look things up in real time and pull in current information, this is a strong option.
Gemini 2.5 Pro
Google’s most capable model. Particularly strong at coding, math, and scientific reasoning. It supports extremely long inputs — one of the longest of any model — which makes it useful for analyzing large codebases or lengthy research papers.
| Plan | Cost | What You Get |
| Free (Gemini.google.com) | $0/month | Gemini Flash, basic features, Google Workspace integration |
| Google One AI Premium | $20/month | Gemini Pro access, integration withGmail/Docs/Drive, 2TB storage |
| API (pay per use) | Varies | For developers; competitive pricing, free tier available |
Best for: People already in the Google ecosystem (Gmail, Docs, Drive), real-time web search integration, and tasks involving very large documents or code.
Meta AI
Meta, the company behind Facebook, Instagram, and WhatsApp, has taken a very different approach from everyone else: they give their AI models away for free. Their model family is called Llama, and anyone can download and run it. Meta also has a built-in AI assistant across their apps.
Llama 3 and Llama 4
Meta’s open-source model family. “Open source” means the underlying code and model weights are publicly available, which is unusual in this industry. Llama 4, released in 2025, comes in several sizes from small to very large. Developers love it because you can run it on your own computer or server without paying anyone per use. The quality at larger sizes is competitive with commercial models.
Meta AI (the assistant)
This is the built-in AI you encounter inside Facebook, Instagram, WhatsApp, and Messenger. It is powered by Llama models and is free to use within those apps. Good for quick questions, image generation, and general help within the Meta app ecosystem.
| Access Method | Cost | What You Get |
| Meta apps (FB, Instagram, WhatsApp) | Free | Meta AI assistant built into apps you already use |
| meta.ai | Free | Standalone Meta AI chat interface |
| Download Llama yourself | Free (hardware costs apply) | Full model you can run locally; needs a reasonably powerful computer |
| Via third-party APIs | Very low cost | Run Llama via cloud providers like Groq or Together.ai for pennies |
Best for: Developers who want to self-host an AI without ongoing subscription fees, privacy-conscious users who want to run AI locally, and Meta app users who want quick AI access without signing up for anything new.
Microsoft (Copilot)
Microsoft invested billions of dollars in OpenAI and, as a result, has woven OpenAI’s models into almost everything they make. Their branded AI product is called Copilot, and it shows up in Windows, Office, Bing search, and more. If you use Microsoft products at work, you have almost certainly already encountered it.
Microsoft Copilot (free)
Available in Windows 11, Bing, and the Edge browser. Powered by OpenAI models. Good for quick web searches with AI-assisted summaries, drafting emails, and everyday help without any extra subscription.
Microsoft 365 Copilot
The enterprise version embedded directly into Word, Excel, PowerPoint, Outlook, and Teams. It can draft documents, summarize meetings, write formulas, and generate presentations from a prompt. This is the product aimed at businesses and professionals.
| Plan | Cost | What You Get |
| Copilot (free) | $0 | AI in Bing, Edge, and Windows; powered by OpenAI |
| Copilot Pro | $20/month | Priority access, AI in Word/Excel/PowerPointfor personal Microsoft 365 users |
| Microsoft 365 Copilot (business) | $30/user/month | Full enterprise AI across all Office apps and Teams |
Best for: People who live in Microsoft Office and want AI built directly into their existing tools without switching to a new app.
xAI (Grok)
xAI was founded by Elon Musk in 2023 after he parted ways with OpenAI. Their model is called Grok, and it is deeply integrated with the social platform X (formerly Twitter). Grok’s defining trait is real-time access to everything posted on X, giving it a live pulse on news and trending topics.
Grok 3
xAI’s current flagship model. Competitive with the top models from OpenAI and Anthropic on reasoning tasks. Its biggest differentiator is real-time X data — if something is happening right now in the world and people are talking about it on X, Grok knows about it faster than most other AI systems.
Grok 3 mini
A smaller, faster, cheaper version for everyday tasks where you do not need the full power of the flagship model.
| Plan | Cost | What You Get |
| X Free | $0 | Very limited Grok access |
| X Premium | $8/month | Standard Grok access |
| X Premium+ | $40/month | Full Grok 3 access with higher limits |
| SuperGrok | $30/month | Standalone subscription with highest limits,image generation, deeper reasoning |
Best for: News junkies, people who spend a lot of time on X, and users who want real-time information baked into their AI responses.
Quick Reference: Who Should Use What
| If you want to… | Try this |
| Just get started with AI for free | ChatGPT (free) or Claude (free) |
| Write better emails and documents | Claude Pro or ChatGPT Plus |
| Get AI inside Microsoft Word and Excel | Microsoft 365 Copilot |
| Search the web with AI help | Gemini (Google) or Grok (X) |
| Work with very long documents | Claude (best-in-class for this) |
| Solve hard math or coding problems | OpenAI o3 or Gemini 2.5 Pro |
| Run AI privately on your own computer | Meta’s Llama or Mistral (open source) |
| Stay on top of breaking news | Grok (real-time X access) |
A Few Things Worth Knowing
Free tiers are real but limited. Every major company offers some level of free access. The free versions are genuinely useful for light use. If you start hitting limits or want access to the most capable models, a $20/month subscription gets you most of what the power users have.
The model names change fast. This industry moves quickly. The models described here are current as of mid-2026, but new versions get released every few months. The underlying companies stay the same; just expect the version numbers to tick up.
None of them are perfect. Every model makes mistakes, sometimes confidently. Always verify important facts, especially for medical, legal, or financial decisions. Treat AI output like advice from a very well-read friend who occasionally gets things completely wrong.
Your data and privacy. Most consumer AI services use your conversations to improve their models by default. If privacy matters to you, look for the opt-out settings in each platform, or use open-source models you run locally.
AI is not magic, and it is not going away. The companies above are all legitimate, well-funded, and actively improving their products. The best way to figure out which one is right for you is simply to try one. Most of them are free to start.
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