🛠️ Tools & Models

ChatGPT Deep Dive

ChatGPT is the world's most popular AI product with over 900M weekly users. The free tier uses GPT-4o Mini; paid ($20/mo) unlocks GPT-4o and o1 reasoning models. It has a huge plugin and tool ecosystem, code interpreter, image generation via DALL-E, and strong third-party integrations.

• Free: GPT-4o mini · Plus $20/mo: GPT-4o + o1 reasoning
• Has built-in code interpreter, image generation, and web search
• Largest user base and ecosystem of any AI product in 2026

Did you know? ChatGPT went from 0 to 100 million users in 2 months — faster than Instagram, TikTok, and every other app in history.

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Claude Deep Dive

Anthropic's Claude is known for exceptional coding ability, long document analysis (200K context), and careful, nuanced reasoning. Claude 3.5 Sonnet and Opus are the top performers on many coding and writing benchmarks. Its Constitutional AI training makes it notably thoughtful on tricky ethical questions.

• Claude 3.5 Sonnet tops many coding and writing benchmarks
• 200K token context window — can read entire codebases
• Trained with Constitutional AI for safe, thoughtful responses

Did you know? Anthropic was founded in 2021 by former OpenAI researchers — including the creators of the reinforcement learning from human feedback (RLHF) technique that made ChatGPT possible.

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Gemini and Google

Google's Gemini Ultra is competitive with GPT-4 and Claude Opus on most benchmarks. Its killer advantage: deep integration with the Google ecosystem — Gmail, Drive, Docs, and Search. Gemini Advanced ($20/mo) includes a 1M token context and Workspace integration that no other model matches at scale.

• Gemini Ultra matches GPT-4 on most benchmarks
• Deep integration with Gmail, Docs, Drive, and Search
• 1M token context window in Gemini Advanced

Did you know? Google has more AI compute than any other company — its TPU (Tensor Processing Unit) chips power both Google Search and Gemini.

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Open Source Models

Meta's Llama 3 and Mistral's models can be downloaded and run locally for free. With a mid-range GPU you can run a capable 8B or 13B parameter model entirely on your own hardware — no API costs, full privacy, and the ability to fine-tune for your specific needs.

• Llama 3 and Mistral can be downloaded and run locally for free
• No API costs and complete data privacy on your own machine
• Fine-tuning lets you specialise the model for specific tasks

Did you know? Llama 3 8B running on a MacBook M3 Pro can generate 50 tokens per second — fast enough for real-time conversation, entirely offline.

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Choosing the Right Model

Different tasks call for different models. For complex coding: Claude. For fast, cheap, simple tasks: GPT-4o Mini or Haiku. For long document analysis: Gemini Advanced or Claude. For free and private: Llama. Build a mental model of the tradeoffs — speed, cost, intelligence, privacy — and match to your task.

• Match the model to the task rather than always using the biggest one
• Claude leads on coding; Gemini on Google Workspace integration
• Smaller models are dramatically cheaper and still very capable

Did you know? Running GPT-4 costs ~30× more per token than GPT-4o Mini — for most tasks, the cheaper model is good enough.

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API vs Chat Interface

The chat interface (ChatGPT, Claude.ai) is the consumer product. The API is for developers: you send structured requests and get structured responses in code, at scale, with fine-grained control. If you build anything with AI, you work with the API. Learning the API is one of the highest-ROI skills of 2026.

• Chat interface = consumer product for everyday use
• API = programmatic access for building apps and automations
• API gives full control: temperature, system prompts, function calling

Did you know? Anthropic charges $3 per million input tokens for Claude 3.5 Sonnet. A 2000-word conversation costs less than $0.01.