Claude

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<article class="doc">

<section>

<p>Claude is Anthropic's conversational assistant. The Claude 5 model family includes Opus 5 (the most capable), Sonnet 5 (a balance of performance and cost) and Haiku 4.5 (fast and light), plus Fable 5.1. Claude is known for writing quality, reasoning, long-document analysis and instruction-following.</p><p>Anthropic's assistant, valued for writing and long documents. See also: <a href="https://newtiv.com/article.html?slug=chatgpt-guide">ChatGPT</a> · <a href="https://newtiv.com/article.html?slug=claude-code-guide">Claude Code</a> · <a href="https://newtiv.com/article.html?slug=quelle-ia-choisir-panorama-2026">Which AI to choose</a>, and our feature on <a href="https://newtiv.com/article.html?slug=les-intelligences-artificielles">artificial intelligence</a>.</p>

</section>

<section>

<p class="eyebrow">01 — What it is</p>

<h2>Claude, explained</h2>

<p>Claude is Anthropic's conversational assistant. The Claude 5 model family includes Opus 5 (the most capable), Sonnet 5 (a balance of performance and cost) and Haiku 4.5 (fast and light), plus Fable 5.1. Claude is known for writing quality, reasoning, long-document analysis and instruction-following.</p>

</section>

<section>

<p class="eyebrow">02 — Strengths</p>

<h2>Where Claude stands out</h2>

<ul class="plain">

<li>Careful, consistent writing with a nuanced tone, strong across languages.</li>

<li>Large context window: analyzing reports, contracts, entire codebases.</li>

<li>"Artifacts" feature (documents and mini-apps produced alongside the chat) and connectors to tools.</li>

<li>An approach centered on safety and faithfully following instructions.</li>

</ul>

<figure class="ill-logo">

<div class="logo-box"><img src="https://upload.wikimedia.org/wikipedia/commons/7/78/Anthropic_logo.svg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original" loading="lazy" decoding="async" alt="Logo Anthropic"></div>

<figcaption>Anthropic — <em>Anthropic

, Public domain</em></figcaption>

</figure>

</section>

<section>

<p class="eyebrow">03 — Limitations &amp; precautions</p>

<h2>What to keep in mind</h2>

<ul class="plain">

<li>Like any model, it can be wrong: verify facts and figures.</li>

<li>Free tier is limited in throughput and model access; the best models are paid.</li>

<li>Availability by country varies depending on the plan.</li>

<li>Data processed by a third party: sensitive use requires the right plan and verified settings.</li>

</ul>

</section>

<section>

<p class="eyebrow">04 — Access &amp; pricing</p>

<h2>How to access it</h2>

<p>Free access with an account on the web and app, with usage limits. Paid plans (individual, team, enterprise) and developer access via API. Also available through third-party cloud platforms. Plans and versions evolve fast: check current pricing and capabilities on the official site.</p>

</section>

<section>

<p class="eyebrow">05 — Professional use cases</p>

<h2>Where Claude helps an organization</h2>

<ul class="plain">

<li>Drafting and rewriting long documents, briefing notes.</li>

<li>Analyzing contracts, reports, specifications.</li>

<li>Code review and refactoring, explaining existing codebases.</li>

<li>Internal assistant connected to a document base (with RAG).</li>

</ul>

</section>

<section>

<p class="eyebrow">06 — Frequently asked questions</p>

<figure class="yt-wrap-outer">

<div class="yt-wrap"><iframe src="https://www.youtube-nocookie.com/embed/-50BGEYgMr4" title="Tout Comprendre sur Claude IA en 22 Minutes"></iframe></div>

<p class="yt-caption">Understanding Claude AI in 22 minutes (in French) — Yassine Sdiri</p>

</figure>

<h2>Frequently Asked Questions</h2>

<h3>What are the Claude models?</h3>

<p>The Claude 5 family: Opus 5 (the most capable), Sonnet 5 (balanced), Haiku 4.5 (fast), and Fable 5.1. Names and capabilities evolve — check Anthropic's site.</p>

<h3>Is Claude free?</h3>

<p>There's a limited free tier. Paid plans give more throughput, better models and data guarantees.</p>

<h3>Claude for code?</h3>

<p>Yes: it's known to be solid at reading and writing code, and there's a command-line tool, Claude Code.</p>

</section>

<section>

<p class="eyebrow">07 — Resources &amp; links</p>

<h2>Where to go, concretely</h2>

<div class="linkgroup">

<p class="cat">Official</p>

<dl class="links">

<div>

<dt>Claude (Anthropic)</dt>

<dd>The service and its plans.</dd>

<dd class="u"><a href="https://claude.ai" target="_blank" rel="noopener">claude.ai</a></dd>

</div>

<div>

<dt>Anthropic — documentation</dt>

<dd>Models, API, best practices.</dd>

<dd class="u"><a href="https://docs.anthropic.com" target="_blank" rel="noopener">docs.anthropic.com</a></dd>

</div>

</dl>

</div>

<div class="linkgroup">

<p class="cat">On NEWTIV</p>

<dl class="links">

<div>

<dt>ChatGPT — NEWTIV</dt>

<dd>Dedicated guide.</dd>

<dd class="u"><a href="https://newtiv.com/article.html?slug=chatgpt-guide" target="_blank" rel="noopener">newtiv.com/article/chatgpt-guide.html</a></dd>

</div>

<div>

<dt>Claude Code — NEWTIV</dt>

<dd>Dedicated guide.</dd>

<dd class="u"><a href="https://newtiv.com/article.html?slug=claude-code-guide" target="_blank" rel="noopener">newtiv.com/article/claude-code-guide.html</a></dd>

</div>

<div>

<dt>Which AI to choose — NEWTIV</dt>

<dd>Dedicated guide.</dd>

<dd class="u"><a href="https://newtiv.com/article.html?slug=quelle-ia-choisir-panorama-2026" target="_blank" rel="noopener">newtiv.com/article/quelle-ia-choisir-panorama-2026.html</a></dd>

</div>

<div>

<dt>Artificial intelligence — NEWTIV</dt>

<dd>Understanding how the models work.</dd>

<dd class="u"><a href="https://newtiv.com/article.html?slug=les-intelligences-artificielles" target="_blank" rel="noopener">newtiv.com/article/les-intelligences-artificielles.html</a></dd>

</div>

</dl>

</div>

</section>

<footer class="cta">

<p class="go">Claude for your business?</p>

<p class="url"><a href="https://www.newtiv.com" target="_blank" rel="noopener">newtiv.com</a></p>

<p class="fine">We assess whether Claude is the right tool for your needs, frame its use (data, rights, verification) and train your team. See also our guide 'Which AI to choose'.</p>

</footer>

</article>