Anthropic Claude 4 系列完全指南：Opus、Sonnet、Haiku 怎麼選？ | Complete Guide to Claude 4: Opus, Sonnet, Haiku

3月 26, 2026

By Kit 小克 | AI Tool Observer | 2026-03-27

🇹🇼 Anthropic Claude 4 系列完全指南：Opus、Sonnet、Haiku 怎麼選？

Anthropic 在 2025 年推出了 Claude 4 系列模型，包含三個層級：Opus、Sonnet 和 Haiku。這三款模型定位不同、能力各異，到底該怎麼選？我實際測試了一輪，分享我的觀察。

三款模型的定位

Claude Opus 4：旗艦級模型，適合複雜推理、長篇寫作、進階程式開發。這是目前 Anthropic 最強的模型，處理多步驟任務的能力明顯優於前代。
Claude Sonnet 4：中階平衡型，速度與品質兼顧。適合日常工作、一般程式輔助、文件整理。性價比最高的選擇。
Claude Haiku 4：輕量快速型，回應速度最快、成本最低。適合簡單查詢、分類任務、大量批次處理。

實測比較

我用幾個常見場景測試了三款模型：

程式碼重構：Opus 能理解整個專案架構並提出系統性建議；Sonnet 處理單一檔案重構表現良好；Haiku 適合簡單的格式修正。
長文寫作：Opus 的邏輯連貫性最佳，能維持數千字的一致風格；Sonnet 在千字以內表現不錯；Haiku 適合短文或摘要。
資料分析：Opus 能處理複雜的多維度分析；Sonnet 適合標準報表；Haiku 適合快速數據提取。

定價與使用建議

API 定價方面，Opus 最貴但能力最強，Haiku 最便宜但功能有限。我的建議是：

日常工作用 Sonnet，它能處理 80% 的任務
遇到真正困難的問題才切換到 Opus
大量簡單任務用 Haiku 節省成本

Extended Thinking 功能

Claude 4 系列支援 Extended Thinking（延伸思考），讓模型在回答前先進行內部推理。這對複雜的數學、邏輯和程式問題特別有效。Opus 的延伸思考能力最強，能展示清晰的推理過程。

整體來說，Claude 4 系列是目前市場上最均衡的 AI 模型家族之一。選哪個？看你的需求和預算。好不好用，試了才知道。

🇺🇸 Complete Guide to Claude 4: Opus, Sonnet, Haiku

Anthropic launched the Claude 4 model family in 2025, featuring three tiers: Opus, Sonnet, and Haiku. Each serves a different purpose, and after hands-on testing, here is my practical breakdown.

Model Positioning

Claude Opus 4: The flagship model for complex reasoning, long-form writing, and advanced coding. It is Anthropic's most capable model, with significantly improved multi-step task handling.
Claude Sonnet 4: The balanced mid-tier option. Great for daily work, general coding assistance, and document organization. Best value for money.
Claude Haiku 4: The lightweight speed demon. Fastest response times and lowest cost. Ideal for simple queries, classification tasks, and high-volume batch processing.

Real-World Testing

I tested all three across common scenarios:

Code Refactoring: Opus understands entire project architectures and suggests systemic improvements. Sonnet handles single-file refactoring well. Haiku works for simple formatting fixes.
Long-Form Writing: Opus maintains the best logical coherence across thousands of words. Sonnet performs well under 1,000 words. Haiku suits short pieces and summaries.
Data Analysis: Opus handles complex multi-dimensional analysis. Sonnet is good for standard reports. Haiku excels at quick data extraction.

Pricing and Recommendations

On the API pricing front, Opus is the most expensive but most capable, while Haiku is the cheapest with limited functionality. My recommendations:

Use Sonnet for daily work — it handles 80% of tasks
Switch to Opus only for genuinely difficult problems
Use Haiku for high-volume simple tasks to save costs

Extended Thinking

The Claude 4 family supports Extended Thinking, allowing the model to perform internal reasoning before answering. This is particularly effective for complex math, logic, and programming problems. Opus has the strongest extended thinking capability, showing clear reasoning chains.

Overall, the Claude 4 family is one of the most well-rounded AI model lineups on the market. Which one should you pick? It depends on your needs and budget. You won't know until you try it.

Sources / 資料來源

AI 工具觀察站 — 每日精選 AI Agent 與工具趨勢
AI Tool Observer — Daily curated AI Agent & tool trends

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