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GPT-6 Astra評測:最貴旗艦模型,跑分卻不是最強 | GPT-6 Astra Review: Priciest Model, Not the Smartest

By Kit 小克 | AI Tool Observer | 2026-09-11

🇹🇼 GPT-6 Astra評測:最貴旗艦模型,跑分卻不是最強

GPT-6 Astra 是 OpenAI 於 2026 年 9 月 3 日發布的最新旗艦推理模型,官方稱它是「全球最聰明、最對齊」的 AI。但實際用起來值不值這個價?跑分是不是真的最強?這篇用真實數據拆給你看。

定價:比 GPT-5.6 Sol 貴 2.5 倍

GPT-6 Astra 的標準 API 費率是每百萬 token 輸入 10 美元、輸出 50 美元,快取輸入 1 美元、快取寫入 12.5 美元。這個價格是上一代 GPT-5.6 Sol 促銷價的 2.5 倍,剛好跟 Anthropic Claude Fable 5.1 的頭牌報價打平。上下文窗口官方標示約 100 萬 token,主打長文件、長對話與多步驟 agent 任務。

跑分好看,但不是全面最強

OpenAI 公布的數據確實漂亮:ExploitBench 拿下 100%、ARC-AGI-3 有 98.6%、FrontierMath Tier 4 v2 達 97.6%,DeepSWE v1.1 則是 74.1%;在最高推理強度下,幻覺率也從上一代的 92% 降到 51%。

不過第三方評測機構 Artificial Analysis 給出不太一樣的畫面:在整體 Intelligence Index(智能綜合指標)上,Claude Fable 5.1 拿下 66 分,GPT-6 Astra 只有 61 分;在專門針對寫程式代理任務的 Coding Agent Index 上,Fable 5.1 一樣以 70 比 67 領先。換句話說,OpenAI 自稱「全球最聰明」,獨立測試卻顯示它跟 Claude 打平甚至略輸,價格卻一樣貴。而 51% 的幻覺率,說白了就是就算開到最高推理強度,還是有一半機率一本正經講錯話,這點官方沒有大肆宣傳。

首款觸發「關鍵網路攻擊」門檻的 AI

比跑分更值得注意的是安全面:GPT-6 Astra 是 OpenAI 依照自家 Preparedness Framework 評出的第一款達到「Critical(關鍵)」網路安全能力等級的模型——意思是只要給它合適的工具與存取權限,它就能自行找出未知漏洞、串出完整攻擊鏈,過程幾乎不需要人一步步帶。

因為這樣,公開版的 ChatGPT 與 API 會拒絕產生概念驗證(PoC)攻擊程式碼;真正的攻擊能力只透過名為「OpenAI Daybreak」的防禦者專案開放,一般開發者申請不到。企業版預設也不會自動開通 Astra,要管理員手動打開。

該不該換?

  • 如果你現在用 Claude Fable 5.1 跑得順,沒有必須換的理由——同樣的價格,獨立跑分反而不如 Fable
  • 場景特別吃重電腦操作、瀏覽器代理這類長流程任務,OpenAI 確實把資源砸在這裡,值得實測比較
  • 想拿到完整資安滲透能力的防禦團隊,記得是申請 Daybreak,不是切個設定就能用

好不好用,試了才知道。


🇺🇸 GPT-6 Astra Review: Priciest Model, Not the Smartest

GPT-6 Astra, OpenAI's newest flagship reasoning model released September 3, 2026, is billed as "the world's most intelligent and aligned" AI. But is it actually worth the price, and does it really top the charts? Here's what the numbers say.

Pricing: 2.5x GPT-5.6 Sol

Standard API pricing is $10 per million input tokens and $50 per million output tokens, with $1 cached input and $12.50 cache writes. That's 2.5x GPT-5.6 Sol's promotional rate and matches Anthropic's Claude Fable 5.1 headline pricing. Context window is listed at roughly 1M tokens, aimed at long documents, long conversations, and multi-step agentic tasks.

Strong Benchmarks — But Not a Clean Sweep

OpenAI's own numbers look impressive: 100% on ExploitBench, 98.6% on ARC-AGI-3, 97.6% on FrontierMath Tier 4 v2, and 74.1% on DeepSWE v1.1. Hallucination rate at max reasoning effort dropped from 92% in the previous generation to 51%.

But independent evaluator Artificial Analysis tells a different story: on the overall Intelligence Index, Claude Fable 5.1 scores 66 versus GPT-6 Astra's 61. On the Coding Agent Index, Fable 5.1 leads again, 70 to 67. So OpenAI's "world's smartest" claim doesn't hold up against third-party testing — Astra ties or slightly trails Claude at the same price point. And that 51% hallucination figure, even framed as an improvement, means the model is still confidently wrong roughly half the time at maximum effort — a detail OpenAI doesn't headline.

First Model to Cross the "Critical Cyber" Threshold

More notable than the benchmarks: GPT-6 Astra is the first model OpenAI has rated as reaching Critical cybersecurity capability under its Preparedness Framework — meaning that with the right tools and access, it can discover previously unknown vulnerabilities and chain them into working exploits with minimal human guidance.

As a result, the public ChatGPT and API versions refuse to generate proof-of-concept exploit code. Full offensive capability is gated behind a program called OpenAI Daybreak, open only to vetted defenders — not general developers. Enterprise access is off by default; admins must manually enable Astra for their workspace.

Should You Switch?

  • If Claude Fable 5.1 already works for your workflow, there's no urgent reason to move — at the same price, independent benchmarks actually favor Fable
  • If your use case leans heavily on computer-use or browser-agent tasks, OpenAI has clearly invested there, and it's worth testing head-to-head
  • Security teams chasing the "Critical cyber" capability need to apply to Daybreak — it's not a toggle you flip on

You won't know until you try it. (好不好用,試了才知道)

Sources / 資料來源

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