Claude Opus 5評測：追平Fable 5效能砍半價格 | Claude Opus 5 Review: Near-Flagship Power at Half the Price

8月 17, 2026

By Kit 小克 | AI Tool Observer | 2026-08-18

🇹🇼 Claude Opus 5評測：追平Fable 5效能砍半價格

Claude Opus 5是Anthropic在2026年7月24日推出的最新模型，效能逼近旗艦模型Fable 5，但API價格只要一半。這篇文章實測介紹Claude Opus 5的定價、效能與適用情境，幫你判斷這次升級到底值不值得。

Claude Opus 5是什麼？

Claude Opus 5是Anthropic旗下Claude系列的新一代高階模型，主打「用一半的錢做接近旗艦等級的事」。它現在已經是Claude Max方案的預設模型，也是Claude Pro用戶能用到最強的選項。

Claude Opus 5價格怎麼算？

Claude Opus 5價格維持在每百萬輸入token 5美元、輸出token 25美元，跟前一代Opus 4.8完全一樣。相較之下，Anthropic自家旗艦Fable 5要價輸入10美元、輸出50美元——換句話說，Claude Opus 5用一半的成本就能拿到接近旗艦等級的表現。

Claude Opus 5效能表現如何？

根據Anthropic公布的內部測試，Claude Opus 5在多項程式撰寫與知識型任務上甚至贏過Fable 5，例如在Frontier Bench v0.1拿下43.3%，Fable 5只有33.7%。對日常開發、程式除錯這類任務來說，Claude Opus 5的CP值明顯更高。

Claude Opus 5有哪些新功能？

百萬token上下文窗口：可以一次塞進大量程式碼或文件
效能調節鈕（low/medium/high effort）：依任務難度手動調整推理深度，控制成本與延遲
資安限制較寬鬆：不受Fable 5的30天資料保留政策限制
Anthropic表示這是目前對齊程度最高的模型

Claude Opus 5適合誰用？

如果你是Claude Code重度使用者，或需要跑大量agent型任務，Claude Opus 5現在是Claude Max方案的預設模型，日常寫程式、跑多步驟agent工作流都會直接吃到這顆模型，不用額外設定。對預算有限但又想要接近旗艦體驗的開發者來說，這次調整算是誠意十足，不是換湯不換藥的行銷包裝。

🇺🇸 Claude Opus 5 Review: Near-Flagship Power at Half the Price

Claude Opus 5 is Anthropic's newest high-end model, launched July 24, 2026, delivering performance close to its flagship Fable 5 at half the API price. Here's what actually changed and whether the upgrade to Claude Opus 5 is worth it.

What Is Claude Opus 5?

Claude Opus 5 is the latest high-end model in Anthropic's Claude lineup, positioned to deliver near-flagship results at a fraction of the cost. It's now the default model for Claude Max plans and the strongest option available on Claude Pro.

How Much Does Claude Opus 5 Cost?

Claude Opus 5 keeps the same pricing as its predecessor Opus 4.8: $5 per million input tokens and $25 per million output tokens. Compare that to Fable 5, Anthropic's actual flagship, priced at $10 input / $50 output — Claude Opus 5 delivers roughly half the cost for work that's often just as good.

How Does Claude Opus 5 Perform?

Anthropic's internal benchmarks show Claude Opus 5 actually outperforming Fable 5 on several coding and knowledge tasks — 43.3% on Frontier Bench v0.1 versus Fable 5's 33.7%. For everyday coding, debugging, and agentic workflows, that's a meaningfully better cost-to-performance ratio.

What's New in Claude Opus 5?

1-million-token context window — fits large codebases or documents in a single pass
Effort toggle (low/medium/high) — trade reasoning depth for cost and latency per request
Looser cybersecurity safeguards and no 30-day data retention requirement
Anthropic calls it its most aligned model to date

Who Should Use Claude Opus 5?

If you're already running Claude Code or agentic workflows, Claude Opus 5 is now the default on Claude Max — you get it automatically without changing any settings. For budget-conscious developers who still want near-flagship quality, this release is a genuine value upgrade, not a marketing repackage.

好不好用，試了才知道（You won't know if it's good until you try it）。

Sources / 資料來源

常見問題 FAQ

Claude Opus 5跟Fable 5哪個比較好？

看任務。Claude Opus 5在部分程式撰寫與知識型測試（如Frontier Bench v0.1）分數甚至更高，但Fable 5仍是Anthropic正式旗艦，兩者定位是「高CP值」對「頂規」的差別。

Claude Opus 5要多少錢？

每百萬輸入token 5美元、輸出token 25美元，跟前一代Opus 4.8相同，只有Fable 5價格的一半。

Claude Opus 5支援多大的上下文？

支援100萬token上下文窗口，可一次處理大型程式碼庫或長文件。

怎麼用到Claude Opus 5？

Claude Max方案已將它設為預設模型，Claude Pro用戶則可手動選用，是目前Pro方案能用到的最強選項。

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