GPT-5.6 Luna降價評測：砍80%、ChatGPT破10億用戶 | GPT-5.6 Luna Price Cut Review: OpenAI Hits 1B Users

8月 09, 2026

By Kit 小克 | AI Tool Observer | 2026-08-10

🇹🇼 GPT-5.6 Luna降價評測：砍80%、ChatGPT破10億用戶

OpenAI在7月30日無預警把GPT-5.6 Luna價格砍了80%，同時官方也證實旗下模型使用者已經突破10億大關、超過200萬家企業在用。這波降價加用戶里程碑，讓GPT-5.6一口氣成了這週AI圈討論度最高的話題——尤其對每天要付API帳單的開發者來說，這次降價不是行銷話術，是實打實省錢。

GPT-5.6 Luna降價多少？省下多少錢？

GPT-5.6 Luna輸入價格從每百萬token 1美元砍到0.2美元，輸出從6美元砍到1.2美元，降幅整整80%；中階的Terra也降了約20%，輸入從2.5美元降到2美元、輸出從15美元降到12美元，旗艦版Sol則維持5美元/30美元沒有變動。

Luna（最划算）：輸入 $0.20、輸出 $1.20 / 百萬token
Terra（平衡型）：輸入 $2、輸出 $12 / 百萬token
Sol（旗艦版）：輸入 $5、輸出 $30 / 百萬token，價格不變

ChatGPT為什麼會衝上10億用戶？

OpenAI表示用戶數突破10億，是靠模型效率提升與服務架構優化把成本壓下來，才有本錢大砍GPT-5.6 Luna價格衝量；不過官方沒說清楚這10億是週活躍還是月活躍，數字含金量得打個問號。

Luna、Terra、Sol該怎麼選？

分類任務、客服機器人、內容摘要這類量大但不需要複雜推理的工作，直接上Luna就夠，成本低到幾乎可以忽略；需要複雜邏輯或長文推理才考慮Terra或Sol，不要為了「用最新最貴」而多花冤枉錢。

降價背後：AI價格戰真的打起來了嗎？

這已經不是OpenAI第一次降價，DeepSeek V4、Kimi K3等開源模型早就用「跑分接近、價格砍半」逼宮，現在GPT-5.6系列反過來大幅降價，某種程度上是被開源陣營逼出來的反應。Forbes直接點名這可能觸發「AI價格競次」——對用戶是好事，對還在燒錢的AI新創來說，利潤空間只會愈來愈薄。

好不好用，試了才知道。

🇺🇸 GPT-5.6 Luna Price Cut Review: OpenAI Hits 1B Users

OpenAI quietly cut GPT-5.6 Luna pricing by 80% on July 30, while confirming its models have crossed 1 billion active users and over 2 million businesses. The pairing of a price cut and a user milestone put GPT-5.6 in the AI news cycle instantly — for developers paying API bills every day, this isn't marketing spin, it's a real cost cut.

How Much Cheaper Is GPT-5.6 Luna Now?

GPT-5.6 Luna input pricing dropped from $1.00 to $0.20 per million tokens, output from $6.00 to $1.20 — an 80% cut. Terra, the mid-tier model, got a smaller ~20% reduction, while Sol, the flagship, stayed unchanged.

Luna (cheapest): $0.20 input / $1.20 output per 1M tokens
Terra (balanced): $2 input / $12 output per 1M tokens
Sol (flagship): $5 input / $30 output per 1M tokens — no change

Why Did ChatGPT Hit 1 Billion Users?

OpenAI credits efficiency gains in its models and serving infrastructure for funding the GPT-5.6 Luna price cut and driving adoption past the 1 billion mark. Notably, OpenAI never clarified whether that figure is weekly or monthly active users — so take the number with a grain of salt.

Which Model Should You Actually Use — Luna, Terra, or Sol?

For high-volume, low-complexity work — classification, support bots, summarization — Luna is now cheap enough to be a no-brainer. Save Terra or Sol for tasks that genuinely need deeper reasoning or long-context handling. Don't overpay for "the newest model" out of habit.

Is This the Start of an AI Price War?

This isn't OpenAI's first price cut, and it won't be the last. Open-weight competitors like DeepSeek V4 and Kimi K3 have been undercutting frontier pricing for months, and GPT-5.6's aggressive discount looks like a direct response. Forbes has already flagged this as a potential "race to the bottom" — good news for users, tighter margins for AI startups still burning cash.

好不好用，試了才知道 — try it yourself before you trust the benchmarks.

Sources / 資料來源

常見問題 FAQ

GPT-5.6 Luna降價後多便宜？

輸入token每百萬美元從1美元降到0.2美元，輸出從6美元降到1.2美元，降幅達80%，是目前OpenAI最划算的模型。

GPT-5.6 Sol也有降價嗎？

沒有，旗艦版Sol價格維持每百萬token輸入5美元、輸出30美元，只有Luna和Terra調降。

ChatGPT的10億用戶是週活躍還是月活躍？

OpenAI官方沒有明確說明，只公布模型使用者突破10億、企業用戶超過200萬家。

一般開發者該選Luna、Terra還是Sol？

分類、客服、摘要等大量簡單任務用Luna最划算；需要複雜推理或長文處理才考慮Terra或Sol。

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