Fish Audio Live 3 vs Grok Voice 3.0：一方の価格はバンドルで、もう一方はコンポーネント

Put the two rate cards side by side and the newer model looks less than half the price. Fish Audio Live 3 sells for $0.035 per minute on Fish Audio's Agent Platform — a promotional rate, half of a $0.07 list, good through 31 December 2026. G​rok Voice 3.0 sells for $0.08 per minute, or $4.80 an hour, plus $0.004 per text input token. Four cents against eight is a clean story until you notice that the two numbers are billing different objects: G​rok Voice 3.0 is a speech-to-speech component you rent, and Live 3's per-minute figure bundles speech recognition, the reasoning model and the voice into one meter. One is a part, the other is an assembly. Compare them per minute and you are comparing a gearbox to a car.

That distinction is the whole comparison, and it is worth being precise about why. G​rok Voice 3.0 is a versioned model string behind a realtime WebSocket with session-scoped tools and returned transcripts, priced by the minute of audio it processes and scored, independently, at 86.9 on the Artificial Analysis Speech to Speech Index. Fish Audio Live 3 is a full-duplex model launched on 10 November 2026 that keeps listening while it speaks, is English-only at launch by the company's own statement, has no published benchmark of any kind, no model identifier in Fish Audio's API documentation, and no weight release — the vLLM project's public reply to the launch was to hope it gets open-sourced one day.

片側にしか存在しないスコアボード

Artificial Analysis measures G​rok Voice 3.0 on the same harness it uses for every duplex model, and the numbers are unusually complete. Every figure below is the board's own, taken from its run dated 13 October 2026.

• 音声推論、Big Bench Audio — 98.5%。

• 会話ダイナミクス、Full Duplex Bench — 97.0%、内訳はバックチャネリング92.9%、割り込み処理96.5%、ターンテイキング100%、ポーズ処理98.5%。

• Speech Agent Arena preference — Elo 1059, against 1074 for G​emini 3.8 Live and 990 for Eleven Realtime v1 Max.

• タスク成功率 — τ-Voiceの航空・小売・通信シナリオ全体で94.8%。

• Time to first audio — 0.81 seconds, slower than G​rok Voice 2.0's 0.70 and roughly 40% quicker than GPT-Live-1 in its Astra medium configuration at 1.34 seconds.

• 入力音声1時間あたりのコスト — $4.80。ベンダー自身の分単位料金をそのまま時間換算したものです。

Live 3's column is not sparse, it is empty, and the emptiness has a specific shape. There is no row on that board for any Fish Audio duplex model as of 11 November 2026 — the board lists Fish Audio as a model family and scores none of its live work. Fish Audio's one published number is 186 milliseconds to decide to respond, which the company describes in the context of short reactions such as "mm-hmm" rather than full answers. It is a vendor floor on an acknowledgement. G​rok's 0.81 seconds is an audited time-to-first-audio on a reply. Nothing about those two figures is commensurable, and the fact that both are expressed in seconds is the trap.

各側の二重の主張が実際に何を約束しているのか

両モデルとも全二重なので、「話しながら聞く」ことは両者を差別化する要素ではなく、参加条件にすぎません。違いは、タイミングポリシーがどこから来るかにあります。

Fish Audioの主張は、相づち、待機、応答、停止が、沈黙のしきい値のリストとして書かれたのではなく、記録された人間の会話から学習されたというものだ。そしてそれを、電話番号を区切って読み上げる例で示している。人間なら1回のためらいとして聞くところを、エージェントが3回の発話終了イベントとして聞き取ってしまうのが、修正対象の失敗である。裏付け資料は3件のサンプル通話で、注文を完了する場面、割り込み、復唱確認中の相づちが含まれる。Fish Audioが公表していないのは、学習されたポリシーがしきい値ベースのポリシーを上回るかどうかを測った結果である。

G​rok Voice 3.0's timing policy is not explained in behavioural terms at all. What xAI published is a rate card, a model string, an alias move — grok-voice-latest now resolves to grok-voice-3.0, and grok-voice-2.0 is flagged deprecated — and, through Artificial Analysis, a set of turn-taking scores that a buyer can read as a risk statement. A 96.5% interruption score is a claim you can test against your own call recordings. A 186-millisecond acknowledgement floor is a claim you have to take on trust until you run it.

The alias move matters more than it sounds in a phone system. G​rok Voice 2.0 became the alias target on 5 August 2026 and was superseded by 3.0 ten weeks later, which means a team that deployed against the alias has already been through two silent model swaps in a quarter. Whether you pin grok-voice-3.0 explicitly is a deployment decision the vendor has effectively forced.

お金が実際にどこへ行き着くのか

バンドル型とコンポーネント型の区分は4つのコスト形状を生み、そのうち実際の通話との接触に耐えて Live 3 に有利に働くのは1つだけだ。

• Agent Platform 上の Live 3 — プロモーション期間中は、認識・推論・音声を含むオールインで 1 分あたり $0.035。電話通話には 1 分あたり $0.01 を追加、電話番号ごとに月額 $1.20、および含まれるモデルからアップグレードする場合はプレミアムティア LLM のトークン料金を追加。10 分の通話は 35 セントに電話料金を加えたものです。

• Live 3 after 31 December 2026 — the list rate is $0.07 per minute, at which point the all-in figure is within a cent of G​rok's $0.08 and the bundle argument has to carry the comparison on its own. Fish Audio has not said what happens to the discount.

• G​rok Voice 3.0 — $0.08 per minute of audio plus $0.004 per text input token, with the reasoning model, the telephony and the orchestration all bought separately. The per-minute rate is a floor, not a total.

• あるいは、自前の推論モデルを使う場合 — 両ベンダーとも頭脳は自分で用意でき、音声レイヤーだけを課金するため、この2つが一致する唯一の形です。

その最後の点は、価格表の中に隠れている実用的な結論だ。もしあなたの製品が推論レイヤーで差別化しているなら、そのバンドルは、あなたが置き換えるつもりだったものに対する割引にすぎない。そうでなければ、そのバンドルは本当に安くてシンプルであり、50%プロモーションは今月の音声分野で最高の取引だ。

調達、そして誰のレートカードも答えてくれない問い

価格とスコアは簡単な半分にすぎない。難しい半分は、モデルがあなたの足元で変わったときに何が起きるかであり、ここで2つのベンダーは正反対の選択をしている。

G​rok Voice 3.0 has a stable interface and an unstable model: same endpoint, same event names, same bearer-token handshake, same voice set, with the model swapped behind an alias. Fish Audio Live 3 has an unstable interface and, for now, a stable model: the platform is in public beta, the duplex model is new, its API documentation does not yet name it, and the launch post is the only document that describes its behaviour. One arrangement asks you to test continuously. The other asks you to read release notes.

どちらも不合理ではない。しかし、両者の間で選択するエンジニアリングチームは、自分たちがどちらのリスクを吸収する方が得意かを気に留めるべきだ。というのも、その答えの方が、毎分4セントよりも、デプロイの成功を予測する力が通常は高いからだ。

ポータブルなレイヤーと、誠実な境界

Both stacks are two-part systems, and in both the speech half is unportable — G​rok Voice 3.0 runs only on xAI's realtime endpoint, Live 3 only on Fish Audio's platform and on enterprise hardware. The reasoning half is where a router belongs, and on both it is a separate purchase: on the G​rok side it is a model you call from inside the session's tools, on the Fish side it is an OpenAI-compatible endpoint the agent points at. OrcaRouter carries more than 200 models behind one key at provider list price with zero markup, so the text model in either stack can be swapped or pinned without renegotiating the speech contract, and automatic failover keeps a session alive when the reasoning backend errors mid-call. Neither speech model is routable here — there is no third-party endpoint for either — and this piece would be misleading if it implied otherwise.

まだ決めかねているチームにとって、最も安価な実験は料金設定が可能にするそれだ。同じ20回の通話を両方で実行し、割り込みを自分たちで採点し、他人の小売シナリオでの94.8%のタスク成功率が自分たちのシナリオについて何かを予測するかを見る。Live 3の186ミリ秒は、モデルの狙いのように感じられるか、エージェントが考える間に発するノイズについての数字のように感じられるかのどちらかだろう。それは料金表では決着できない問いであり、請求書が届いた後に重要になる唯一の問いだ。