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Grok 4.6評測:50萬token長上下文追平GPT-5.6 | Grok 4.6 Review: 500K Context Ties GPT-5.6

By Kit 小克 | AI Tool Observer | 2026-08-20

🇹🇼 Grok 4.6評測:50萬token長上下文追平GPT-5.6

Grok 4.6 是 xAI 於 2026 年 8 月 12 日發布的最新旗艦模型,主打 50萬(500K)token 超長上下文,跑分在 Artificial Analysis Intelligence Index 上追平 GPT-5.6 Sol Max。這篇評測整理它實際升級了什麼、跑分數字,以及值不值得換。

Grok 4.6 這次改了什麼

先講重點:Grok 4.6 不是更大的底層模型,而是在 Grok 4.5 基礎上做的一次「訓練後優化」(post-training upgrade)。xAI 這次把心力放在三件事:

  • 更長的補充訓練(supplemental training run)
  • 重新生成的監督式微調(SFT)軌跡
  • 在真實代理環境中的強化學習(RL in agentic environments)

換句話說,底座沒變,但「怎麼用」變聰明了——特別針對長時間運行的 AI Agent、程式碼代理、以及互動式視覺任務做了調校。

跑分數字:Grok 4.6 vs GPT-5.6

在 xAI 自己公布的表格中,Grok 4.6(High 模式)在 Artificial Analysis Intelligence Index 拿下 61 分,比 Grok 4.5 的 56 分明顯進步,也和 GPT-5.6 Sol Max 打平。幾個亮點:

  • GDPval-AA v2:1753 Elo(Grok 4.5 為 1526)
  • AA-Briefcase:1577 分(Grok 4.5 為 1313)
  • 新增 xhigh 推理強度選項(low / medium / high / xhigh)

知識截止日為 2026 年 2 月 1 日,支援文字與圖片輸入,但輸出僅限文字。

定價與實用性

API 定價為每百萬 input token 2 美元、output token 6 美元,對比同級模型不算貴,但 50萬 token 上下文意味著長對話、長程式碼庫分析的成本會快速累積,實際使用前建議先估算 token 消耗。

該不該換?

如果你的工作流是長時間跑的 coding agent或需要一次餵進整個大型 repo/文件集,Grok 4.6 的上下文長度和 agentic 跑分升級確實有感;但如果只是日常對話或短任務,跟 Grok 4.5 或 GPT-5.6 相比差異不會太明顯,沒必要急著換。

好不好用,試了才知道。


🇺🇸 Grok 4.6 Review: 500K Context Ties GPT-5.6

Grok 4.6 is xAI's latest flagship model, released August 12, 2026, headlined by a 500K-token context window that now ties GPT-5.6 Sol Max on the Artificial Analysis Intelligence Index. Here is what actually changed, the benchmark numbers, and whether it is worth switching.

What Actually Changed in Grok 4.6

The headline: Grok 4.6 is not a bigger base model. It is a post-training upgrade on top of Grok 4.5. xAI focused on three things:

  • A longer supplemental training run
  • Regenerated supervised fine-tuning (SFT) trajectories
  • Reinforcement learning inside real agentic environments

In short, the foundation is the same — but the model got noticeably better at long-running AI agents, agentic coding, and interactive visual work.

Benchmarks: Grok 4.6 vs GPT-5.6

On xAI's own launch table, Grok 4.6 (High) scores 61 on the Artificial Analysis Intelligence Index, up from 56 for Grok 4.5, and tied with GPT-5.6 Sol Max. Notable results:

  • GDPval-AA v2: 1753 Elo (vs. 1526 for Grok 4.5)
  • AA-Briefcase: 1577 (vs. 1313 for Grok 4.5)
  • New xhigh reasoning effort tier (low / medium / high / xhigh)

Knowledge cutoff is February 1, 2026. It accepts text and image input, with text-only output.

Pricing and Practical Use

API pricing is per million input tokens and per million output tokens — reasonable for its tier. But a 500K-token context window means long conversations or full-repo analysis can rack up cost fast. Estimate your token usage before committing a workflow to it.

Should You Switch?

If your workflow involves long-running coding agents or feeding entire large repos or document sets into a single context, Grok 4.6's context length and agentic benchmark gains are genuinely useful. For everyday chat or short tasks, the difference from Grok 4.5 or GPT-5.6 won't be dramatic — no need to rush the switch.

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

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