Claude by Anthropic: All Models, All Capabilities — A Complete Plain-Language Guide (July 2026)

In late 2022, a group of AI researchers made a bet. They believed the most important thing in the history of technology was being built — artificial general intelligence — and that the labs building it were not being careful enough. So they left OpenAI, raised money, and started a company whose entire purpose was to build the most capable AI possible while figuring out how to make it safe.

That company is Anthropic. Their AI is Claude.

Three years later, Claude is used by millions of people every day — for writing, coding, research, analysis, translation, and complex reasoning. It runs inside Amazon's AWS cloud, inside Google's infrastructure, and directly at claude.ai. As of July 2026, Anthropic has released six different Claude models, each built for different needs, from casual questions to the hardest problems in science and business.

This article explains all of it: what Claude is, what it can do, how the models differ, how to use it free, and what makes it meaningfully different from ChatGPT and Gemini.

What Is Anthropic?

Anthropic was founded in 2021 by Dario Amodei (CEO) and Daniela Amodei (President), along with several other researchers who had previously worked at OpenAI. The founding team included some of the people who built GPT-3.

The core idea behind Anthropic is called Constitutional AI — a methodology for training AI systems to be helpful, harmless, and honest, not by trying to ban specific topics but by giving the AI a set of values it reasons from. Instead of training Claude to avoid saying certain words, Anthropic trains Claude to reason about what is good and harmful and to act accordingly.

This is why Claude behaves differently in practice:

• It says "I don't know" when it genuinely doesn't, instead of guessing


• It acknowledges uncertainty in its own answers


• It pushes back on requests that seem potentially harmful, but explains why


• It will not help with genuinely dangerous things even if the user phrases the request cleverly

Anthropic has raised billions of dollars from Amazon and Google, making it one of the best-funded AI companies in the world. Its funding has allowed it to train increasingly capable AI systems while keeping safety research at the centre.

The Claude Model Lineup: July 2026

As of July 2026, Anthropic offers six active Claude models. Each serves a different purpose — and three of them are accessible free.

Claude Haiku 4.5 — The Everyday Fast Model

Best for: Quick questions, basic tasks, fast replies, high-volume use

Haiku is Claude's fastest and most affordable model. It has a 200,000-token context window — enough to hold a very long document — and responds in seconds. It is ideal for:

• Quick factual questions


• Short summaries


• Simple writing help


• Customer service interactions


• Applications where speed matters more than depth

At $1 per million input tokens and $5 per million output tokens in the API, it is also the most cost-efficient Claude model for developers building applications. For regular users, it is available free through claude.ai.

Claude Sonnet 4.6 — The Balanced Everyday Powerhouse

Best for: Most people, most tasks — the best balance of speed and intelligence

Sonnet 4.6 is the model Anthropic recommends for the vast majority of use cases. It has a 1-million-token context window (enough for several long books), up to 64,000 tokens of output in a single response, and strong performance on:

• Complex writing and analysis


• Research and summarisation


• Coding assistance


• Multi-step reasoning


• Translation (including Hindi and other Indian languages)

Sonnet is the model most people encounter in the free tier at claude.ai. At $3 per million input tokens, it costs 3× less than Opus while delivering excellent results for most tasks.

Claude Opus 4.6, 4.7, 4.8 — The Highly Capable Family

Best for: Difficult problems, long autonomous tasks, complex reasoning

The Opus family represents Claude's highest-capability models before Fable 5. All three share a 1-million-token context window and support 128,000 tokens of output.

Opus 4.8 is the current-generation Opus — Anthropic describes it as "highly autonomous, state-of-the-art on long-horizon agentic work, knowledge work, and memory." It is particularly good at:

• Complex multi-step tasks that require sustained reasoning


• Writing long, high-quality documents


• Advanced coding (debugging, refactoring, architecture)


• Research tasks that require synthesising many sources


• Any task where thoroughness matters more than speed

At $5 per million input tokens, Opus costs more than Sonnet — but for genuinely complex work, the quality difference is significant.

Opus 4.6 and 4.7 remain available for developers who have tuned their applications to specific model versions.

Claude Fable 5 — The Most Powerful AI (July 2026)

Best for: The hardest possible problems — research, science, complex autonomous agents

Fable 5 is Anthropic's newest and most capable model, representing a new tier above Opus. It has a 1-million-token context window, 128,000-token output capacity, and is Anthropic's answer to the frontier of what AI can currently do.

Fable 5 is priced at $10 per million input tokens and $50 per million output tokens — significantly more expensive than Opus — which reflects both its capability and the cost of running it. It is primarily used by:

• Researchers and scientists with demanding analysis needs


• Developers building the most sophisticated AI applications


• Organisations that need the maximum possible AI performance

For most individuals, Sonnet or Opus will serve well. Fable 5 is for cases where you genuinely need the best.

What Claude Can Do: Capabilities Explained

Reading and Understanding Long Documents

Claude's context window — up to 1 million tokens — is one of its defining features. To put this in perspective: a typical novel is about 100,000 words, or roughly 130,000 tokens. Claude can hold an entire book in its "working memory" and reason across it coherently.

In practice, this means:

• Upload a full legal contract and ask Claude to identify the risky clauses


• Paste an entire research paper and ask for a plain-language summary


• Share a 500-page financial report and ask specific questions about it


• Provide your entire codebase and ask Claude to find bugs or explain how it works

No other widely available AI has this combination of context window size and reasoning quality.

Vision: Reading Images, Charts, and Documents

Claude can see and understand images. You can:

• Upload a photo and ask questions about it


• Share a chart or graph and ask Claude to explain what the data shows


• Photograph a handwritten document and ask Claude to transcribe or translate it


• Share a screenshot of an error message and ask for help fixing it


• Upload a medical report image and ask Claude to explain the terms

The Opus 4.7 and later models support high-resolution image understanding up to 2,576 pixels on the long edge — meaning Claude can read fine print, analyse detailed charts, and understand complex diagrams.

Coding

Claude is one of the best AI coding assistants available. It can:

• Write code in Python, JavaScript, PHP, Java, Go, Ruby, C++, SQL, and dozens of other languages


• Debug existing code — find the error and explain why it happened


• Explain what a piece of code does, in plain language


• Refactor code to make it cleaner or more efficient


• Write tests for existing code


• Build entire applications from a description

Many professional software developers use Claude daily. Claude Code — Anthropic's dedicated coding tool — is used by developers to automate entire software development workflows.

Writing and Analysis

Claude produces some of the most natural, nuanced written English of any AI. It can:

• Write essays, reports, emails, proposals, and articles


• Edit and improve your existing writing


• Change the tone of text (formal/informal, simple/technical)


• Summarise long documents into key points


• Translate between languages — including Hindi, Bengali, Tamil, Telugu, and other Indian languages

Where other AIs sometimes produce text that "sounds AI-written," Claude tends to produce prose that reads naturally, with appropriate structure and flow.

Extended Reasoning

Opus and Fable 5 models support adaptive thinking — a feature where Claude reasons through a problem step by step before giving you its answer. This is particularly useful for:

• Maths and logic problems


• Complex decision-making


• Problems with multiple interacting constraints


• Scientific analysis

When thinking is active, Claude works through the problem visibly, checks its own reasoning, and produces a more reliable answer. This is similar to showing your work in school — but the work is Claude's internal reasoning.

Tool Use and Agentic Tasks

Claude can use tools — it can browse the web, write and run code, read files, and interact with external services. When given the right tools, Claude can:

• Research a topic by searching the web and synthesising what it finds


• Write code and then run it to verify the output


• Read a document, extract key data, and produce a formatted report


• Perform multi-step tasks autonomously over many minutes or hours

Anthropic calls these "agentic" capabilities — Claude acting as an agent that takes actions over time, not just answering a single question.

How to Use Claude: Free Access Guide

claude.ai — The Direct Way

claude.ai is Anthropic's own website. Sign up with any email address — no credit card needed. The free tier gives you access to Claude Sonnet and limited access to Opus, with generous daily usage limits.

On claude.ai you can:

• Type questions and get answers (like any AI chat)


• Upload documents and images for analysis


• Use Projects — a feature where Claude remembers context across many conversations


• Access Claude's built-in tools (web search, code running, document creation)

Claude Pro — the paid tier at $20/month — gives you higher usage limits, priority access during busy periods, and more access to Opus and Fable 5.

Claude in Other Apps

Claude is also available through:

• Amazon Bedrock — for developers using AWS infrastructure


• Google Cloud Vertex AI — for developers using Google Cloud


• Claude Code — a dedicated coding tool (command-line interface) for software developers


• Many third-party apps that have integrated the Claude API

Using Claude in Hindi

Claude Sonnet and above support Hindi fluently. You can type to Claude entirely in Hindi and receive responses in Hindi. Example:

• `मुझे इस दस्तावेज़ का सारांश हिंदी में चाहिए`
• `कृपया मेरे इस आवेदन पत्र को बेहतर बनाइए`
• `मुझे भारत के श्रम कानूनों के बारे में सरल भाषा में समझाइए`

Claude will respond in the language you write in. This makes it accessible for Hindi speakers who find English-first AI tools less comfortable.

How Claude Is Different From ChatGPT and Gemini

All three — Claude, ChatGPT, and Gemini — are large language models that can write, reason, code, and converse. But they have meaningful differences:

Honesty and uncertainty: Claude is trained to say "I don't know" or "I'm not certain" more readily than other models. If you ask about something Claude isn't confident about, it will tell you that, rather than presenting a guess with false confidence. This makes Claude safer to rely on for important decisions.

Context window: Claude's 1-million-token context window is larger than ChatGPT's standard offering (though GPT-4 also has long-context variants). For tasks involving very long documents — entire codebases, long legal contracts, full research papers — Claude's context capacity gives it an advantage.

Writing quality: Many writers and journalists prefer Claude's prose style. It writes with more nuance, appropriate hedging, and natural flow than other models. It is less likely to produce the repetitive, generic-feeling text that AI writing sometimes produces.

Safety approach: Claude uses Constitutional AI — it reasons from principles rather than just trying to avoid specific words. This makes it more consistent in its behaviour and less susceptible to clever prompting that tries to get it to behave badly.

Coding: Claude and ChatGPT are both extremely strong at coding. Claude's advantage tends to be in reading and understanding large codebases, and in producing well-structured, readable code. ChatGPT and Gemini have their own strengths, particularly in integration with their respective ecosystems.

Real-time information: Unlike Gemini (which integrates Google Search) and the web-browsing versions of ChatGPT, Claude does not browse the live web by default. Its knowledge has a training cutoff. For questions about current events, Gemini's real-time search integration can be an advantage. However, Claude can use web search when given that tool access.

What Claude Is Not Good At

To use Claude well, it helps to know its limitations:

Current events: Claude's training has a knowledge cutoff. It may not know about things that happened in the last few months. For current news and very recent data, supplement Claude with live web searches.

Specific local information: Claude may not know the details of a specific district scheme in your state, the contact information for a local office, or very niche regional information. Verify this kind of detail on official government portals.

Mathematics computation: Claude can reason through mathematical problems, but it sometimes makes arithmetic errors. For calculations you depend on, verify the output or use a calculator.

Hallucination: Like all AI models, Claude can sometimes state incorrect facts with apparent confidence — a phenomenon called "hallucination." Always verify important claims (statistics, legal clauses, medical information) through authoritative sources before acting on them.

Not a replacement for professionals: Claude can explain legal concepts, medical terms, or financial principles — but it is not your lawyer, doctor, or financial advisor. Use Claude to understand your situation; consult a professional for decisions with serious consequences.

Constitutional AI: Why Claude Thinks the Way It Does

Most AI safety approaches work by trying to prevent the AI from doing specific bad things — creating lists of banned topics and trying to detect when the AI is about to discuss them. Anthropic's approach is different.

Constitutional AI gives Claude a set of values and trains it to reason from those values. Claude is trained to ask: is this helpful? Is this honest? Could this cause harm? And to answer those questions through genuine reasoning, not pattern-matching against a list.

This has several practical effects:

• Claude is more consistent in its behaviour across different phrasings of the same request


• Claude can explain why it won't help with something — not just refuse


• Claude is less susceptible to "jailbreaks" — clever prompts designed to trick it into bad behaviour


• Claude acknowledges nuance — it can help with something that has dual uses (a knife, a chemical, an explanation of how diseases spread) while being thoughtful about context

Anthropic publishes research on Constitutional AI and makes its safety findings public. This transparency about how Claude works is one of the things that distinguishes Anthropic from some other AI labs.

What You Can Do

• Try Claude free today at claude.ai. Sign up with your email. Start with a complex question you've been struggling with — a legal document you don't understand, a medical report you want explained, a problem at work you need help thinking through.
• Use Claude in Hindi. If English is not your first language, write to Claude in Hindi or your preferred Indian language. The quality of response in Hindi is good and improving.
• For coding tasks: If you write code, paste a piece of code you're stuck on and ask Claude to find the bug, explain what it does, or rewrite it more clearly.
• For long documents: If you have a long contract, report, or document to read, upload it to claude.ai (free tier supports document uploads) and ask Claude to summarise the key points or flag anything unusual.
• Compare with other tools: Claude, ChatGPT, and Gemini each have strengths. For writing and analysis, try Claude. For real-time web information, try Gemini. For Microsoft-ecosystem integration, try Copilot. The best AI users use multiple tools.

Sources

• Anthropic — company and research overview
• Claude — direct access and free tier
• Anthropic model documentation — Claude model specifications, July 2026
• Anthropic research — Constitutional AI: Harmlessness from AI Feedback (original paper)
• Anthropic API — model overview and specifications