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Claude Opus 5 Effort設定評測:中等檔位反而勝過最高檔 | Claude Opus 5 Effort Levels Review: Medium Beats Max

By Kit 小克 | AI Tool Observer | 2026-08-25

🇹🇼 Claude Opus 5 Effort設定評測:中等檔位反而勝過最高檔

Claude Opus 5 在7月底上線時,最大賣點是新增了五段式的effort(推理強度)設定——min、low、medium、high、max,讓使用者自己決定要模型「想多久」。但Anthropic沒有大聲講的一件事是:在最新的FrontierCode v1.1程式碼基準測試裡,medium檔位的分數竟然打平甚至超過high跟max,而且運算成本只要一半。這篇文章帶你搞懂Claude Opus 5 effort到底該怎麼調。

什麼是Claude Opus 5的Effort設定?

Effort設定是Anthropic讓開發者控制模型內部「思考」多少token才回答的參數,分成min、low、medium、high、max五檔,檔位越高代表模型花越多運算在推理上,速度越慢、費用越高。

Medium為什麼會比High表現更好?

根據第三方FrontierCode v1.1的測試,Opus 5在medium檔位拿下主測集53.4%、延伸測集63.6%的分數,是所有效果等級裡的最高點;拉高到high或max,分數不升反降或停滯。原因不難理解——對已經能正確解出的程式問題,額外的推理反而容易讓模型「想太多」,把簡單解法複雜化,甚至改壞原本對的答案。

但也不是每個任務都這樣

Anthropic自己在攻克IMO 2026數學證明題時,用的是adaptive thinking搭配max檔位,失敗才降檔重試;獨立評測機構Vals AI的測試裡,也是high檔位表現最好。換句話說,Claude Opus 5 effort沒有放諸四海皆準的最佳解,任務類型才是關鍵。

實際使用該怎麼選?

  • 日常寫程式、Code Review:先從medium開始,多數情境已經夠用
  • 數學證明、複雜多步推理:值得試high甚至max,搭配失敗重試機制
  • 企業大量呼叫、成本敏感:優先壓在low/medium,同時追蹤品質有沒有掉
  • 不確定的新任務:先跑一輪A/B測試,不要憑感覺調到最高檔

Kit小克怎麼看

「開越高檔就越聰明」是很直覺但常常錯的假設。Opus 5的effort分級測試提醒我們:推理成本不是免費的性能加成,調錯檔位反而可能讓輸出變差、帳單變貴兩頭空。與其迷信max,不如花十分鐘拿自己的真實任務跑一次基準測試。

好不好用,試了才知道。


🇺🇸 Claude Opus 5 Effort Levels Review: Medium Beats Max

Claude Opus 5 launched in late July with a headline feature: a five-tier effort setting — min, low, medium, high, and max — that lets you control how hard the model "thinks" before answering. What Anthropic didn't put in the announcement: on the independent FrontierCode v1.1 coding benchmark, medium effort matches or beats high and max, at roughly half the compute cost. Here's what the Claude Opus 5 effort data actually says, and how to pick a setting.

What Is the Claude Opus 5 Effort Setting?

Effort controls how many internal reasoning tokens Opus 5 spends before producing a response. Five levels — min, low, medium, high, max — trade latency and cost for theoretically better reasoning.

Why Does Medium Beat High on Coding Tasks?

FrontierCode v1.1 results show Opus 5 peaking at medium effort: 53.4% on the main set, 63.6% on the extended set — its best scores across every tier tested. Pushing to high or max doesn't help; scores plateau or slightly drop. The likely reason: on coding problems the model can already solve correctly, extra reasoning tends to overcomplicate a fine solution rather than improve it.

Not True for Every Task

Anthropic's own IMO 2026 proof-solving run used adaptive thinking at max effort, resampling at lower tiers only after failures. Independent evaluator Vals AI also found high effort performed best in its own testing. So there's no universal "best" Claude Opus 5 effort level — it depends heavily on the task type.

How Should You Pick a Setting?

  • Everyday coding and code review: start at medium — it covers most cases
  • Math proofs, multi-step reasoning: test high or max, ideally with retry-on-failure logic
  • High-volume, cost-sensitive workloads: default to low/medium and monitor for quality drift
  • Unfamiliar new tasks: run your own quick benchmark before assuming higher is better

Kit's Take

"Higher effort equals smarter" is an intuitive but often wrong assumption. Opus 5's effort-tier data is a reminder that reasoning compute isn't a free performance boost — the wrong setting can leave you with worse output and a bigger bill at the same time. Skip the instinct to max everything out; spend ten minutes benchmarking your actual workload instead.

好不好用,試了才知道。(Only real testing tells you if it's worth it.)

Sources / 資料來源

常見問題 FAQ

Claude Opus 5的effort設定有幾種?

共五種:min、low、medium、high、max,等級越高代表模型使用越多推理token,速度變慢、費用增加。

寫程式任務該用哪個effort等級?

根據FrontierCode v1.1測試,medium檔位在程式碼任務上分數最高,建議先從medium開始測試,不必一開始就開到max。

什麼情況下該用high或max?

複雜多步推理任務(如數學證明)較適合high或max,並搭配失敗重試機制效果更好。

Effort調高一定比較準確嗎?

不一定。多項測試顯示部分任務在高效果檔位反而分數持平或下降,因為過度推理可能讓已正確的答案被想壞。

Claude Opus 5的effort設定會影響費用嗎?

會,效果等級越高代表消耗越多推理token,運算成本也隨之提高,企業用戶建議先用medium控制成本。

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