What Claude Can Do
Claude is the conversational AI service developed by Anthropic. It handles a wide range of tasks from writing and summarizing to research and programming support. It is especially noted for coding, reading long documents, and honest responses.
Honesty here refers to qualities such as not answering as if it knows something it does not, and avoiding unfounded claims. In the latest model Opus 4.8, announced on May 28, 2026, the model is reported to flag uncertainties about its work more readily and to make unfounded claims less often, and this improvement in honesty is emphasized. In other words, Claude is becoming less likely to assert things without basis, which helps with research and drafts where accuracy matters.
Early testers report that Opus 4.8 is more likely to flag uncertainties about its work and less likely to make unsupported claims. — From the description of Opus 4.8's honesty
The latest model also added an effort setting that lets you choose how deeply it thinks per use. Choosing "fast" makes replies quicker, while "deep" produces a more careful reasoning process. You can switch between casual questions and involved deliberation within the same model. This effort control is available on every plan, paid or free.
A new control alongside the model selector lets users choose how much effort Claude puts into a response. ... Users now have this choice—the effort control is available on all plans. — From the description of Opus 4.8's effort control
The Difference Between Opus, Sonnet, and Haiku, and How to Choose
Claude's models split into three tiers by performance and use. Understanding the difference makes it easier to pick the model that fits your work.
| Opus | The top-tier model. Suited to difficult analysis, coding, and long-running autonomous tasks. The latest Opus 4.8 belongs here. |
|---|---|
| Sonnet | The balanced model. Covers everything from everyday work to moderately complex content. The latest version, Sonnet 5, is the default model on the Free and Pro plans. |
| Haiku | A model for lightweight use. Easy to handle when you prioritize short questions and quick processing. |
The basic approach is to try a more manageable model first, then switch to a higher tier when you need more accuracy or throughput. Rather than insisting on the top tier from the start, choosing a model based on the weight of the work is the basic way to use Claude comfortably.
On June 30, 2026, Sonnet 5, the latest version of Sonnet, was released and became the default model on the Free and Pro plans. It is positioned as delivering performance approaching the top-tier Opus 4.8 at a lower cost. Without any special setup, the Free and Pro plans use this new Sonnet 5 by default.
Claude Sonnet 5 is available across all plans: it is the default model for Free and Pro plans, and is available to Max, Team, and Enterprise users. — From the Claude Sonnet 5 announcement page (Availability and pricing)
The details of Sonnet 5's performance and pricing are covered in the article on what Claude Sonnet 5 is.
Claude Pricing and What You Get for Free
You can start using Claude from the web at claude.ai or via the API. There is a range you can try for free and paid plans that include higher-tier models and expanded usage limits. A clear method is to confirm how it feels without cost first, then move to a paid plan only once you actually need it.
Beyond Anthropic's own service, Claude can also be used from external platforms such as Amazon Bedrock and Microsoft Foundry.
Models are available through the Claude API, Claude Platform on AWS, Amazon Bedrock, Google Cloud, and Microsoft Foundry. — From "Choosing a model" in Models overview
The latest Opus 4.8 supports a 1-million-token context window on any of the Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry. It is a specification that pays off when you want to feed in long materials all at once.
Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, and Claude Sonnet 4.6 have a 1M-token context window on the Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry. — From "Context window sizes by model" in Context windows
Pricing and the contents of the free tier can be revised. Before subscribing, always confirm the latest plans and availability in sources such as the Anthropic official news.
Claude vs ChatGPT
Claude and ChatGPT are both high-performance conversational AIs, but they emphasize different things. Claude is noted for strengths in coding, handling long text, and honest responses, with quality emphasized for long-running autonomous tasks and agent use.
ChatGPT, on the other hand, offers a wide range of features including images and voice, plus a rich set of plan options. Since which is better depends on your use case, comparing several in practice and choosing the one that fits your work is the realistic call.
Where Claude Fits in Business
Claude suits uses that draw on its strengths in handling long text and responding honestly. Even without specialist knowledge, it helps in situations like these.
- Read long contracts and materials and organize the key points and cautions
- Draft emails and reports and refine the wording
- Organize minutes and split them into decisions and to-dos
- Verify research with supporting evidence attached
- Ask it to proofread and polish your writing
Because it tends to avoid unfounded assertions, it also suits drafting work where fact-checking matters. It is safest to use it on the premise that a person makes the final call on important decisions.
Tips for Using Claude with Long Documents
When you have Claude read long materials for summaries or research, preparing the material in Markdown format beforehand improves accuracy. This is because heading hierarchy and table structure are preserved, making it easier for the AI to grasp the content correctly.
Pasting a web page as-is can mix in styling and layout information that gets in the way of reading. Converting the source to Markdown before handing it over is a shortcut to stable results.
Text and files you enter are processed within your own environment and are not sent to sakutto's servers. You can format confidential materials with peace of mind.
How to Get Started with Claude and the Basics of Using It
You can start Claude for free from the web (claude.ai) with an email address or a Google account. The steps are simple, and even first-timers can begin within a few minutes.
- Visit the official site and create an account
- Log in and type a question or instruction into the input box
- Add follow-up requests to the reply (make it shorter, put it in a table, and so on) to refine it
The trick is not to aim for perfection in one shot but to get closer to the answer you want through back-and-forth. Adding conditions like "for whom," "in what format," and "about how many words" tends to return text closer to your intent. When you hand over a long document, being specific in your request, such as asking for the key points as a bulleted list or for the cautions to be pulled out, leads to answers that are easier to work with.
Cautions When Using Claude
Convenient as it is, AI can answer with content that sounds plausible but differs from the facts. Claude is reported to have a strong tendency to avoid unfounded claims, but even so, for information that needs accuracy such as figures, proper nouns, and dates, do not take the answer at face value and verify against primary sources.
Also, when entering confidential or personal information directly, we recommend checking your workplace's rules. For important decisions, it is a safer approach to treat the AI's answer as a draft and have a person make the final call.
If cost is a concern, we recommend starting within the free range first. Once needs arise, such as using it in daily work, handling long materials at once, or boosting accuracy with the higher-tier Opus, you can then consider a paid plan that fits your usage without waste. If you are unsure whether Claude or ChatGPT suits you better, trying both within their free ranges and comparing how they feel on the tasks you do often before deciding helps you avoid a poor fit.
