Meta Llama 4完全解説|GPT-4o超えの無料AIが1000万トークン対応

伊東雄歩
監修者 伊東 雄歩

株式会社ウォーカー CEO。東北大学卒。MENSA会員、JDLA認定講師、健全AI教育協会理事。生成AI×教育・学習科学を専門とし、2億円超のシステム開発プロジェクトを統括。

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  • Meta「Llama 4」正式リリース。Scout(109B)・Maverick(400B)の2モデル構成
  • 業界最長の1000万トークンコンテキストウィンドウ(Scout)
  • Mixture of Experts(MoE)で400Bパラメータでも17Bしか使わない超効率設計
  • GPT-4oやGemini 2.0 Flashを上回るベンチマーク性能(Maverick)
  • 完全オープンソース。30兆トークンで学習した最強の無料AIモデル

2026年4月5日、Metaが「Llama 4」を正式リリースしました。

Scout(スカウト)とMaverick(マーベリック)の2モデル構成で、業界最長の1000万トークンコンテキストウィンドウを搭載。

しかもGPT-4oやGemini 2.0 Flashを上回るベンチマーク性能を達成しながら、完全オープンソースで無料公開。

AIの勢力図を大きく塗り替える存在になりそうです。

Llama 4とは?MetaのAIモデルファミリー

Llamaシリーズは、FacebookやInstagramの親会社Metaが開発するオープンソースの大規模言語モデル(LLM)です。

ChatGPTの「GPT-4」やGoogleの「Gemini」は基本的に有料サービスとして提供されています。

一方、Llamaは誰でも無料でダウンロードして使えるオープンソース。

研究者、開発者、企業が自由にカスタマイズできるのが最大の魅力です。

たとえるなら、GPT-4が「高級レストランの料理」だとすると、Llamaは「レシピと材料が無料で公開されている料理」。自分のキッチンで好きなようにアレンジできるのです。

Llama 4は、このシリーズで最も大きなアーキテクチャの転換となりました。従来のDense(密)モデルからMoE(Mixture of Experts)アーキテクチャに移行し、さらに最初からマルチモーダル(テキスト+画像)対応として設計されています。

Scout vs Maverick|2つのモデルの違いを完全解説

Llama 4はScout(スカウト)とMaverick(マーベリック)の2つのモデルで構成されています。

Llama 4 Scout(軽量・超長文特化)

  • 総パラメータ数: 109B(1090億)
  • エキスパート数: 16
  • 1回の推論で使うパラメータ: 17B(170億)のみ
  • コンテキストウィンドウ: 1000万トークン(業界最長)
  • 動作環境: NVIDIA H100 GPU 1台で動作可能

Llama 4 Maverick(高性能・汎用)

  • 総パラメータ数: 400B(4000億)
  • エキスパート数: 128
  • 1回の推論で使うパラメータ: 17B(170億)のみ
  • コンテキストウィンドウ: 100万トークン
  • GPT-4o・Gemini 2.0 Flashを上回るベンチマーク

注目すべきは、どちらのモデルも実際に使うパラメータは17Bだけという点。

Maverickは総パラメータが400Bもありますが、1回の処理で動くのは17Bのみ。

これがMoEアーキテクチャの威力です。

MoE(Mixture of Experts)とは?「専門家チーム」のAI

MoE(Mixture of Experts)は、Llama 4の核心技術です。わかりやすく説明しましょう。

従来のAIモデルは、すべての質問に対してすべてのパラメータ(脳の神経)を使う設計でした。

たとえるなら、「病院で患者が来るたびに、すべての医師が全員で診察する」ようなものです。

非効率ですよね。

MoEは違います。

質問の内容に応じて、最適な「専門家(Expert)」だけが対応する仕組みです。

プログラミングの質問にはプログラミング専門家が、料理の質問には料理専門家が答える。

128人の専門家チームのうち、必要な人だけが動くのです。

結果として、Maverickは400Bの知識を持ちながら、実際の計算量は17B分で済む。DeepSeek v3と同等の推論・コーディング性能を、半分以下のアクティブパラメータで実現しています。

1000万トークンの衝撃|本を丸ごと読めるAI

Scoutの1000万トークンコンテキストウィンドウは、業界最長です。これがどれくらいすごいか、具体的な数字で見てみましょう。

  • 一般的な文庫本1冊: 約5〜10万トークン
  • GPT-4oのコンテキスト: 128Kトークン(約1.3冊分)
  • Claude 3.5のコンテキスト: 200Kトークン(約2冊分)
  • Llama 4 Scout: 1000万トークン(約100冊分)

つまり、百科事典を丸ごと読み込んで理解することが可能です。企業の何年分ものドキュメントを一度に分析したり、膨大なコードベースを丸ごと把握したりする用途に威力を発揮します。

ベンチマーク比較|GPT-4o・Gemini・DeepSeekとの対決

具体的なベンチマーク性能を競合と比較しましょう。

Llama 4 Scout(109B)の比較対象

  • vs Gemma 3(Google): 幅広いベンチマークでScoutが上回る
  • vs Gemini 2.0 Flash-Lite: Scoutが上回る
  • vs Mistral 3.1: Scoutが上回る

Llama 4 Maverick(400B)の比較対象

  • vs GPT-4o(OpenAI): 幅広いベンチマークでMaverickが上回る
  • vs Gemini 2.0 Flash(Google): Maverickが上回る
  • vs DeepSeek v3: 推論・コーディングで同等性能(ただしMaverickはアクティブパラメータが半分以下)

オープンソースで無料のモデルが、有料サービスのGPT-4oを上回るという事実は、AIの民主化を加速させるでしょう。

日本への影響|企業は何が変わる?

Llama 4のリリースは、日本企業にとって大きなチャンスです。

  • コスト削減 — GPT-4oのAPI料金を払わなくても、同等以上の性能が無料で使える
  • データ主権 — 自社サーバーで動かせるため、機密データをOpenAIやGoogleに送る必要がない
  • カスタマイズ — 日本語特化のファインチューニングが自由にできる
  • 長文処理 — 1000万トークンで、契約書や法律文書の一括分析が可能に

特に日本語性能は、30兆トークンという膨大な学習データ(Llama 3の2倍)により大幅に向上していると期待されます。日本のAIスタートアップやSIerにとって、Llama 4をベースにしたサービス開発が加速するでしょう。

よくある質問(FAQ)

Q. Llama 4は個人のPCで動かせますか?

ScoutはNVIDIA H100 GPU 1台で動作するよう最適化されていますが、個人のPCでは難しいです。

ただし、量子化(モデルの圧縮)版が公開されれば、RTX 4090などの高性能GPUで動かせる可能性があります。

クラウドGPUサービスを使うのが現実的です。

Q. 商用利用は可能ですか?

はい。

Llama 4は商用利用可能なオープンソースライセンスで提供されています。

ただし、Metaの利用規約に従う必要があります。

Q. ChatGPTやClaudeより優れていますか?

ベンチマーク上では、MaverickがGPT-4oを上回る結果を出しています。

ただし、実際の使用感はタスクによって異なります。

日本語の自然さやクリエイティブな文章では、Claude 4.5やGPT-4oが強い場面もあるでしょう。

Q. 「Llama 4 Behemoth」というモデルも聞きましたが?

MetaはLlama 4 Behemoth(ビヒーモス)というさらに大規模なモデルの存在を示唆しています。

2兆パラメータ規模と噂されていますが、まだリリースされていません。

今後の発表に注目です。

まとめ

この記事のポイントを振り返りましょう。

  • Meta「Llama 4」が2026年4月5日に正式リリース
  • Scout(109B): 業界最長1000万トークン対応、H100 1台で動作
  • Maverick(400B): GPT-4oを超えるベンチマーク性能
  • MoEアーキテクチャで、400Bの知識を17Bの計算量で活用
  • 30兆トークンで学習(Llama 3の2倍)
  • 完全オープンソースで商用利用可能。AIの民主化が加速

無料で使えるAIがGPT-4oを超える時代。

Llama 4は、企業のAI戦略を根本から見直すきっかけになるかもしれません。

まだ試していない方は、Llama公式サイトからチェックしてみてはいかがでしょうか。

参考文献

  • Meta AI. (2026, 4月). The Llama 4 herd: The beginning of a new era of natively multimodal AI innovation. Meta AI Blog
  • Llama公式サイト. (2026). Unmatched Performance and Efficiency | Llama 4. Llama
  • NVIDIA Developer Blog. (2026). NVIDIA Accelerates Inference on Meta Llama 4 Scout and Maverick. NVIDIA
  • Analytics Vidhya. (2026). Meta Llama 4 Models: Features, Benchmarks, Applications & More. Analytics Vidhya
  • RunPod. (2026). Llama 4 Scout and Maverick Are Here—How Do They Shape Up?. RunPod

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