What is Claude?
Claude AI is a family of large language models from Anthropic and one of ChatGPT's main rivals. The first Claude launched in 2023, and the lineup has since grown into three tiers — fast Haiku, versatile Sonnet, and powerful Opus — joined in 2026 by a new flagship class: Claude Fable 5. Claude writes and debugs code, digests documents hundreds of pages long, works in dozens of languages, and runs as an agent, completing multi-step tasks on its own.
This overview covers the current Claude lineup, what each model is good at, how Claude differs from ChatGPT, and how to try it in minutes.
Claude models in 2026
Anthropic refreshes the lineup several times a year. Here are the models that matter right now — all of them available in GPTunneL on the Claude family page:
| Model | Best for | Context |
|---|---|---|
| Claude Fable 5 | Flagship: long-running agent tasks, complex coding, huge projects | 1M tokens |
| Claude Opus 5 | Deep reasoning, research, code architecture | 1M tokens |
| Claude Sonnet 5 | The workhorse: writing, analysis, everyday coding | 1M tokens |
| Claude Haiku 4.5 | Speed and savings: quick answers, high-volume tasks, chatbots | 200K tokens |
Previous-generation models — Opus 4.8, Opus 4.7, and Sonnet 4.6 — remain in the catalog: they cost less and are still strong when a task doesn't call for the latest flagships. We've covered the key models in depth: Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, and Claude Haiku 4.5.
Claude Fable 5 — the flagship
In June 2026 Anthropic released Claude Fable 5, the first public model of the Mythos class, a tier above Opus. On Anthropic's internal evaluations it outperforms every previous Claude, especially on tasks that demand long autonomous work: during testing, Stripe used it to migrate a ~50-million-line Ruby codebase in a single day — a job estimated at over two months of manual team effort.
Fable 5 is the most expensive model in the family, so save it for genuinely hard problems: large refactors, hours-long agent runs, analysis of massive document sets. For day-to-day work, Sonnet 5 is usually enough.
What Claude can do
Code and development
Programming has always been Claude's strongest suit: the family consistently leads SWE-bench, the benchmark built on real software-engineering tasks. Claude writes and fixes code, explains errors, proposes architecture, and carries a project through a series of edits. Claude models power Claude Code, a terminal-based development agent that reads your codebase, makes changes, and runs tests on its own. We've also compared Claude vs ChatGPT for programming in detail.
Long context and documents
A context window of up to 1M tokens fits several thick books in a single request. Hand Claude a contract, a financial report, technical documentation, or an entire project thread and ask for a summary, a version comparison, or answers grounded in the text. The model keeps track of details across the whole input, not just the opening pages.
Image analysis
All current Claude models understand images: they read text from scans and photos and make sense of charts, tables, diagrams, and interface screenshots. That makes them handy for presentations and reports — upload a slide, get a breakdown.
Agents and tools
Modern Claude models work with tools: searching the web, calling APIs, and executing chains of actions without step-by-step supervision. Sonnet 5 and the higher tiers are built for exactly these scenarios — from "gather the data and draft a report" to autonomous coding sessions.
Languages
Claude writes fluently in dozens of languages, keeping tone and cultural nuance intact, and translates carefully. For outward-facing text — articles, emails, documentation — it's one of the strongest models on the market.
Where Claude shines
- Developers — pair programming, code review, refactoring, legacy migrations; agent sessions via Claude Code where the model drives a task all the way to green tests.
- Analysts and lawyers — contracts, reports, and regulations: the long context lets you load an entire document and question it directly, not a summary of it.
- Writers and marketers — articles, newsletters, landing pages, adapting copy to a brand voice; Claude holds style over long stretches.
- Students and researchers — the model explains hard topics step by step and helps you work through papers and data instead of just handing over an answer.
- Business — customer support on the fast Haiku 4.5, internal assistants and process automation on Sonnet 5.
Claude vs ChatGPT: what's the difference?
Both families are top-tier, and on many tasks the gap is small. But their characters differ:
- Code. Developers tend to pick Claude: higher SWE-bench scores, cleaner edits in large codebases, and Claude Code is built on it.
- Long-form writing. Claude holds style more consistently over large volumes and slips into boilerplate less often; editors and copywriters often prefer it.
- Honesty. Claude is more willing to admit it doesn't know something instead of confidently making things up — a product of Anthropic's safety approach (Constitutional AI).
- Ecosystem. ChatGPT ships a broader set of built-in products — image generation, voice mode. Claude is first and foremost a powerful text model and agent.
The practical way to choose is not to read benchmarks but to compare models on your own task: in the GPTunneL Arena you can send one prompt to two models and see the answers side by side.
How to try Claude
You don't need a separate subscription for each AI vendor — Claude is available in GPTunneL:
- Sign up at GPTunneL — it takes a couple of minutes.
- Pick a Claude model in the chat: Fable 5, Opus 5, Sonnet 5, Haiku 4.5, or a previous-generation model.
- Top up your balance and pay per use.
There's no subscription: you pay for tokens as you go, and one balance covers every model — so you can compare Claude with GPT or Gemini in the same conversation. All Claude models in GPTunneL have web access, and there's a unified API for your own bots and apps.
Claude FAQ
Which languages does Claude support?
Claude works confidently in dozens of languages — it writes natural-sounding articles, emails, and posts, and translates while preserving meaning and style.
Which Claude model is the most powerful?
Claude Fable 5, the 2026 flagship of the Mythos class. It shines in long agent tasks and complex coding. For most everyday work Sonnet 5 is enough, while Haiku 4.5 covers fast, high-volume scenarios at a fraction of the cost.
How is Claude better than ChatGPT?
Claude is usually stronger in programming, long-document work, and writing where style matters. ChatGPT wins in multimedia scenarios and ecosystem breadth. The best way to decide is to run your own task through both models in the Arena.
Do I need a subscription to use Claude?
On Anthropic's official site, advanced models require a paid plan. In GPTunneL there's no subscription: top up your balance and pay only for the tokens you actually use — convenient if you don't need AI every single day.
How do I try Claude right now?
Sign up for GPTunneL, pick any Claude model in the chat, and ask a question — it takes a couple of minutes.
Try Claude Fable 5 and the rest of the family in GPTunneL — no subscriptions, pay per use, one balance for every top AI model.