Claude 4（4.5 Sonnet/4.5 Opus）
The New Standard for 2026: The Claude 4 / 4.5 Series From late 2024 through 2026, the Claude 4 generation redefined AI capabilities. Today, its culmination—the Claude 4.5 series—powers business and creative workflows worldwide.
Its defining feature is the ability to switch between two geniuses tailored to specific tasks: the “Sonnet for Practical Work” and the “Ultimate Opus.”
Categories: Latest AI
Tags: Freemium
Other versions of Claude 4（4.5 Sonnet/4.5 Opus）
For detailed specifications and features of each Claude 4（4.5 Sonnet/4.5 Opus） model, please refer to the detailed page for each version.- Feature Tool Claude For Sheets
- Core Tool Claude AI
- Feature Tool Claude 3.5 Sonnet
- Feature Tool Claude 3.7 Sonnet
What you can do with Claude 4（4.5 Sonnet/4.5 Opus） and why it’s useful
◆Claude 4.5 Sonnet: The “Master of Practical Work” Ready for 24-Hour Battles
“When in doubt, start with this model.” Since its debut in late 2025, it has rapidly become the global standard. It combines intelligence surpassing even the former top-tier model (Opus) with unstoppable response speed.
Strengths: Praised for possessing the “most human-like sensibility” in design (UI/UX) proposals, programming, and generating natural Japanese.
Evolution: Eliminated the “momentary pause (delay)” before responses present in earlier models, enabling interactions without interrupting the flow of thought.
Ideal For: Business professionals seeking to boost work efficiency, engineers wanting to write code, writers desiring high-quality text.
◆Claude 4.5 Opus: The “Autonomous Agent” that completes tasks
“The pinnacle of an era where you can ‘hand off’ work entirely to AI.” As of 2026, this flagship model boasts the world's highest intelligence index. Its true strength lies in its “agent capabilities” that go beyond simple chat—it can independently complete hours-long research or complex data analysis with a single instruction.
Strengths: Large-scale system design and solving problems from ambiguous instructions. A significant price reduction has led to explosive adoption in professional settings.
Evolution: Dramatically improved logical consistency. Even during lengthy, complex tasks, it accurately judges “what is acceptable and unacceptable” until completion, executing flawlessly.
Ideal for: Researchers, data scientists, and leaders formulating business strategies.
Claude 4（4.5 Sonnet/4.5 Opus）: An Honest Practical Review
Pros
Sonnet 4.5 is incredibly responsive, maintaining the natural flow of conversation. The wait time between asking a question and receiving a response is extremely short, making you barely notice any “thinking time”—a major advantage. Its Japanese naturalness is also at a high level. Whether drafting business emails or explaining code during programming, it consistently provides responses that accurately grasp the context. It's a versatile model you can easily rely on for tasks ranging from everyday work to slightly more complex requests.
Points of Concern
While it is a well-balanced model, when used for extremely long periods of thought or to fully autonomously advance multiple processes, compared to higher-tier models (Opus series), there may be more instances where human judgment is required. Additionally, depending on your usage plan, you may quickly reach limits on usage frequency or time slots, so be aware that waiting times can occur during periods of intensive use.
Overall Evaluation
Claude Sonnet 4.5 is “the optimal solution for daily use, balancing speed, intelligence, and stability.” If you're unsure, choosing this will cover most use cases sufficiently. For those who want to use AI through natural conversation without sacrificing efficiency, it feels like the most user-friendly Claude available right now.
Claude 4（4.5 Sonnet/4.5 Opus） :Q&A
How do I get started with Claude 4（4.5 Sonnet/4.5 Opus）? Do I need an account?
You can register using an email address or a Google account.
SMS verification via a mobile phone number is required during signup.
Claude is available on web browsers as well as iOS and Android apps, all using the same account.
Who owns the content generated by Claude 4（4.5 Sonnet/4.5 Opus）? Is commercial use allowed?
Commercial use is permitted. Claude’s commercial terms explicitly state that ownership of generated content is transferred to the user.
However, users are responsible for ensuring that generated content does not infringe on third-party rights.
What are the pricing plans for Claude 4（4.5 Sonnet/4.5 Opus）? Is it free or paid?
Claude is available for free, including access to the latest models such as Claude 3.5 Sonnet, with daily message limits.
【Paid Plan (Pro)】
A monthly subscription significantly increases usage limits, provides priority access during peak times, and grants early access to new features.
View all questions
Is Claude 4（4.5 Sonnet/4.5 Opus） safe? Is there a risk of personal data leakage?
Anthropic places a strong emphasis on safety.
While conversation data may be used for training by default, users can disable this in personal settings or through Team and Enterprise plans, which offer enhanced security controls.
Is it easy to cancel or stop using Claude 4（4.5 Sonnet/4.5 Opus）?
Paid Pro plans can be canceled in just a few clicks from the billing settings, and Pro features remain available until the next renewal date.
Accounts can also be fully deleted from the settings page, after which associated data is permanently removed.
What kind of company developed Claude 4（4.5 Sonnet/4.5 Opus）?
Anthropic is a U.S.-based AI startup founded by former OpenAI executives.
Backed by major investments from Amazon and Google, the company is known for its Constitutional AI approach, prioritizing safety, fairness, and human-centered design.
What can Claude 4（4.5 Sonnet/4.5 Opus） actually do? How is it used in practice?
Claude excels at natural language generation and long-context processing.
Long-form summarization: Analyze entire books or lengthy reports at once
Natural translation: Produce smooth, context-aware translations
Coding support: Generate and preview application code using Artifacts
It is particularly well-suited for users who value human-like writing and for tasks involving large volumes of text.
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