Seedance 2.0 vs Sora 2：同一プロンプトで実施したAPI実機テスト（2026年版）

「Seedance vs Sora」を比較した記事のほとんどは、スペック表の比較にとどまっています。私たちは両モデルに同じ3つのプロンプトを入力し、出力を記録してフレーム単位でスコアリングしました。動画の実証映像、コピー可能なAPIコード、そして選択を左右するかもしれない料金の詳細とともに、その結果をお伝えします。

Seedance 2.0（ByteDanceのSeedチームによる）は、今回のテスト全体で総合8.5/10を獲得し、Sora 2の8.0/10を上回りました。差がついた箇所は予想とは異なるものでした。

テストのセットアップ

私たちは、異なる能力をストレステストするために3つのプロンプトを設計しました：

1. スローモーション物理演算 — 磁器の花瓶が砕け散る（パーティクルダイナミクス、マテリアルレンダリング）
2. ダイナミックな人間の動き — 夜の屋上でのブレイクダンス（解剖学、モーションブラー、ネオンライティング）
3. 表情とライティング — 魔法の本を発見する老婦人（微細な表情、ボリュメトリックライト）

方法論： 各プロンプトは両方のAPIに一字一句そのまま送信しました。チェリーピッキングなし — 各モデルから最初に生成されたものを使用しました。動画は15秒、無編集です。スコアリングには6つの次元を使用：画質、プロンプト遵守度、物理/解剖学的リアリズム、ライティング、モーションの流動性、ディテールの豊かさ。

なぜこれが重要か： AI動画APIの上にプロダクトを構築する場合、どのモデルがあなたのユースケースに対応できるかを知る必要があります。スペック表では、Sora 2の人体解剖学が一時停止時に破綻することや、Seedanceの60fpsがスローモーションシーンを目に見えて滑らかにすることは分かりません。

既存の「Seedance vs Sora」記事はすべて、機能リストの比較や単一のチェリーピッキングされた例に依存しています。制御された同一プロンプトと体系的なスコアリングを使用したものはありません。それが、このテストが埋めるギャップです。

テストしなかったもの： 今回はテキストオーバーレイの品質、マルチシーンナラティブ、オーディオ同期の精度は評価していません。これらは独自の専用テストに値します。また、テキストから動画モードに限定しました — 画像から動画、動画から動画の比較は、フォローアップで計画しています。

Seedanceは解像度をトレードオフして2倍のフレームレートを実現しています。Soraはフレームあたり約2.5倍のピクセルを提供します。どちらの選択も、異なるコンテンツタイプに対して実際の影響があります — 以下でご覧いただけます。

オーディオについての簡単な注記：両モデルとも同期されたオーディオ（対話、効果音、音楽）を生成しますが、サンプルレートが異なります。Soraの96kHz出力はCD品質を超えていますが、Seedanceの44.1kHzは標準的なCDオーディオと一致します。実際には、ほとんどの配信プラットフォーム（YouTube、TikTok、Instagram）は48kHz以下にダウンサンプリングするため、この違いが最終配信で問題になることはほとんどありません。

テスト1 — スローモーション物理演算（磁器の花瓶）

プロンプト：

A porcelain vase falls from a marble table in slow motion. Camera starts with a close-up of the vase wobbling on the edge, then follows it downward with a smooth tracking shot as it shatters on a stone floor. Fragments scatter in all directions. Dust particles float in warm afternoon sunlight streaming through a window. Shallow depth of field, 24fps cinematic look

Seedance 2.0

優れている点： ボケと温かい光のレンダリングが本当に映画的に感じられます。60fpsで、スローモーションの落下はバターのように滑らか — 個々の破片をフレームごとに追跡でき、ジャダーは一切ありません。青白い磁器の釉薬が午後の光を捉える様子は、本物の青磁と全く同じで、花瓶が落下中に回転するにつれて自然に変化する柔らかい鏡面ハイライトがあります。

浅い被写界深度の実行は特筆に値します。背景要素は自然なグラデーションでぼけており、安価な実装で見られるハードエッジのマスクではありません。大理石のテーブルの金色のエッジトリムは前景で鮮明なままで、背後の部屋は説得力を持って落ちていきます。

弱点： 破片が硬い石の床への衝撃に対して十分に散乱していません。実際の磁器がその速度で石に当たると、破片は数フィート四方に飛び散るはずですが、ここでは狭い半径内に集まっています。プロンプトで特に要求された塵や陶器の粉末は見えません。落下する花瓶にもモーションブラーがなく、空中フレームでわずかな「浮遊」感を生み出しています。

Sora 2

優れている点： 破砕のディテールが優れています。破断点で釉薬の下に灰色の陶器素地（素焼き）が見える — ほとんどの3Dレンダリングでも試みられないような、微妙だが物理的に正確なディテールです。胴体が砕ける間も首が無傷なのは、実際の陶器の応力分布と一致しています：首は花瓶の中で最も厚く、最も構造的に強化された部分です。

破片の端は脆性材料の破壊と一致する、不規則なコンコイダル（貝殻状）の破砕パターンを示しています。いくつかの破片は釉薬が素地から剥がれた薄い端を持ち、他は厚い断面を示しています。この破砕の多様性のレベルが「説得力がある」と「明らかにCG」を分けるものです。

弱点： 優れた破砕物理演算にもかかわらず、一部の破片は依然としてわずかな「浮遊」感を示しています — 石の上でバウンドしてスライドするのではなく、衝撃後に急速に減速しすぎています。塵の粒子はSeedanceと同様に欠落しています。また、この大きさの花瓶が硬い表面に当たった場合に期待されるよりも、破片の数が少ないです。

Test 1 Verdict

Sora 2 wins on fracture detail and raw resolution. The higher pixel count and more convincing break physics make this a clear edge for static-heavy or close-up content.

Seedance 2.0 wins on motion smoothness. The 60fps frame rate makes the slow-motion fall visually smoother. If your use case is actual slow-motion video (ads, product demos), that frame rate matters.

Both models failed to generate floating dust particles in sunlight — a shared limitation of current AI video generation. Volumetric particle effects (dust, smoke, mist) remain a weak point across all diffusion-based video models, likely because training data rarely isolates these subtle atmospheric elements.

Score summary for Test 1:

Sora 2 takes this round by a narrow margin, driven by superior fracture physics and resolution. But if your use case prioritizes smooth slow-motion playback over freeze-frame detail, the 60fps advantage tips back toward Seedance.

Test 2 — Dynamic Human Motion (Rooftop Breakdance)

Prompt:

A street dancer performs an explosive breakdance routine on a rain-soaked city rooftop at night. Neon lights from surrounding buildings reflect off the wet surface. Camera circles the dancer in a dynamic 360-degree orbit. The dancer transitions from a power move into a freeze pose. Dramatic rim lighting, cinematic color grading with teal and orange tones

Seedance 2.0

Standout: This is where Seedance 2.0 truly shines. The teal-and-orange color grading is executed precisely. Neon reflections on the rain-soaked rooftop are stunning — red and cyan complementary colors map naturally onto the wet surface. The atmosphere is immersive enough for a professional music video.

The 60fps advantage is decisive here. Fast arm sweeps, power moves, and transitions look fluid rather than stuttery. Clothing has weight and drapes correctly during motion — the hoodie fabric stretches and bunches at the shoulders in ways that suggest real textile physics.

The color grading deserves a closer look. Teal and orange are complementary colors, and the prompt specifically requested this combination. Seedance didn't just tint the image — it placed warm orange neon sources behind the dancer (creating rim light) and cool cyan sources in front, then let the wet rooftop surface mix both colors in reflections. This is how a cinematographer would actually light this scene.

Water behavior on the rooftop is also convincing. The surface has a thin, even layer of water that reflects the cityscape above. When the dancer moves, you can see subtle disturbance patterns radiating outward from points of contact. It's not perfect fluid simulation, but it reads as "wet ground" instantly.

Sora 2

The anatomy problem is serious. During freeze poses and handstands, the dancer's hands dissolve into the ground contact surface — individual fingers are indistinguishable. The torso becomes tube-like rather than showing realistic ribcage-to-pelvis structure, losing the natural width variation between chest, waist, and hips. A second arm disappears entirely in some frames, creating an anatomical gap that breaks the illusion.

Foot and shoe edges exhibit a "melting" quality, where the boundary between footwear and air becomes soft and undefined. This is a common failure mode in diffusion-based video models when limbs overlap or contact surfaces.

It looks fine while playing at normal speed. Pause any frame during a freeze pose and things fall apart. For content that will only be viewed as video (social media, ads), this may be acceptable. For anything that might be screenshotted, thumbnailed, or analyzed, it's a dealbreaker.

Test 2 Verdict

Seedance 2.0 wins decisively. The anatomy accuracy gap (8.5 vs 6.5) is the largest single-dimension difference across all three tests. For any content involving dynamic human movement — dance, sports, action sequences — Seedance is the more reliable choice right now.

The 60fps frame rate compounds this advantage. At 30fps, fast breakdance movements produce noticeable judder. At 60fps, they're smooth.

If you're building a product that generates human-motion content through an AI video API, this result should heavily influence your model selection.

Score summary for Test 2:

This is the widest gap across all three tests. Seedance outperforms in every single dimension. The anatomy accuracy delta (8.5 vs 6.5) alone should be disqualifying for Sora in human-motion applications where frame-level quality matters.

For developers working on fitness apps, dance content platforms, sports highlights, or any product featuring dynamic human movement, this test provides strong evidence for defaulting to Seedance 2.0.

Test 3 — Facial Expression & Lighting (Elder Bookshop)

Prompt:

A wise elderly woman with silver hair and round spectacles sits in a cluttered antique bookshop. She picks up a leather-bound book, opens it, and her expression shifts from curiosity to wonder as golden light emanates from the pages. The light illuminates her face and the surrounding book spines. Camera slowly pushes in from medium shot to close-up on her face. Warm tungsten lighting mixed with the magical golden glow.

Seedance 2.0

Standout: The bookshop environment is extraordinary. It feels like a real, lived-in space — books stacked chaotically on floors and tables, period-appropriate props scattered naturally. The scene evokes a Dickensian bookshop or an Oxford study. Seedance built the entire world around the character, not just the character.

The golden light has actual volume. It interacts correctly with silver hair edges and fabric folds, creating natural rim highlights. The light doesn't just illuminate the face — it casts subtle warm reflections on the nearest book spines and creates a gentle glow on the table surface. This kind of multi-surface light interaction is what sells the "magical" quality of the scene.

The expression transition is worth examining in detail. It's not a simple cut from "neutral" to "amazed." You can see a sequence: concentration as she opens the book → slight confusion as the light first appears → recognition → genuine wonder with slightly parted lips and widened eyes. This micro-expression layering is what separates AI-generated faces that feel "alive" from those that feel "posed."

Sora 2

The "wax face" problem: Sora 2 renders elderly skin that's simultaneously wrinkled and oddly smooth. The forehead lacks the texture density you'd expect — age spots, pore visibility, and the slight translucency of thin elderly skin are all muted. Some areas of the face read as 70+ years old (around the eyes), while others look closer to 50 (forehead, cheeks). This inconsistency breaks the uncanny valley in close-up shots — exactly the shot this prompt calls for.

The bookshop environment, while atmospheric, is less layered than Seedance's version. It has a green banker's lamp and well-handled depth of field, but lacks the rolling ladder, floor-level book stacks, brass instruments, ink bottles, and other period props that make Seedance's version feel like a real space rather than a set.

Test 3 Verdict

Seedance 2.0 wins on facial detail and environmental richness. For character-driven content — storytelling, narrative ads, emotional close-ups — Seedance produces more believable faces and richer worlds.

Both models nail the golden magical light effect. That's a tie.

Score summary for Test 3:

Seedance wins this round through more convincing facial aging and a richer environment. The "wax face" issue with Sora is particularly problematic in close-up shots, which are exactly what this prompt demands with its "medium shot to close-up" camera push.

For narrative content, short films, character-driven ads, or any application where emotional authenticity matters, Seedance's facial rendering is a meaningful advantage.

For more on getting the best results from Seedance prompts, see our prompt engineering guide.

Technical Specs Comparison

Here's the full technical breakdown based on our actual output analysis:

Key takeaways:

• Seedance's 60fps produces 2× more frames in the same duration, which is why motion looks smoother
• Sora's higher resolution is better for content that will be paused or screenshotted
• Seedance's multimodal @-reference system allows combining image, video, and audio inputs in a single prompt — a capability Sora 2 doesn't offer
• Seedance supports 1080p output as well (see API parameters below), though our tests used the default 720p

API Access & Code Examples

Both models are accessible via REST APIs. Here's how to call each one.

Seedance 2.0 via EvoLink API

EvoLink provides unified API access to Seedance 2.0 with async task processing. Here's a complete Python example:

import requests
import time

API_KEY = "your-evolink-api-key"  # Get one at evolink.ai/dashboard/keys
BASE_URL = "https://api.evolink.ai/v1"

def generate_video(prompt: str, duration: int = 15, quality: str = "720p") -> str:
    """Generate a video with Seedance 2.0 and return the video URL."""

    # Step 1: Submit generation task
    response = requests.post(
        f"{BASE_URL}/video/generations",
        headers={
            "Authorization": f"Bearer {API_KEY}",
            "Content-Type": "application/json",
        },
        json={
            "model": "seedance-2.0",
            "prompt": prompt,
            "duration": duration,
            "quality": quality,
            "aspect_ratio": "16:9",
            "generate_audio": True,
        },
    )
    response.raise_for_status()
    task_id = response.json()["task_id"]
    print(f"Task submitted: {task_id}")

    # Step 2: Poll for completion
    while True:
        status_resp = requests.get(
            f"{BASE_URL}/tasks/{task_id}",
            headers={"Authorization": f"Bearer {API_KEY}"},
        )
        status_resp.raise_for_status()
        task = status_resp.json()

        if task["status"] == "completed":
            video_url = task["output"]["video_url"]
            print(f"Done! Video URL (valid 24h): {video_url}")
            return video_url
        elif task["status"] == "failed":
            raise RuntimeError(f"Task failed: {task.get('error', 'Unknown error')}")

        print(f"Status: {task['status']}... waiting 5s")
        time.sleep(5)


# Run the porcelain vase test
video = generate_video(
    prompt=(
        "A porcelain vase falls from a marble table in slow motion. "
        "Camera starts with a close-up of the vase wobbling on the edge, "
        "then follows it downward with a smooth tracking shot as it shatters "
        "on a stone floor. Fragments scatter in all directions. "
        "Dust particles float in warm afternoon sunlight streaming through a window. "
        "Shallow depth of field, 24fps cinematic look"
    ),
    duration=15,
    quality="720p",
)

Multimodal input example — using an image as the first frame:

response = requests.post(
    f"{BASE_URL}/video/generations",
    headers={
        "Authorization": f"Bearer {API_KEY}",
        "Content-Type": "application/json",
    },
    json={
        "model": "seedance-2.0",
        "prompt": "@Image1 as first frame, the vase begins to wobble and fall",
        "image_urls": ["https://example.com/porcelain-vase.jpg"],
        "duration": 10,
        "quality": "1080p",
    },
)

For advanced multimodal workflows with @Image, @Video, and @Audio references, see our @Tags guide.

Sora 2 via OpenAI API

from openai import OpenAI

client = OpenAI()  # Uses OPENAI_API_KEY env var

# Submit video generation
response = client.responses.create(
    model="sora",
    input=[{
        "type": "text",
        "text": (
            "A porcelain vase falls from a marble table in slow motion. "
            "Camera starts with a close-up of the vase wobbling on the edge, "
            "then follows it downward with a smooth tracking shot as it shatters "
            "on a stone floor. Fragments scatter in all directions. "
            "Dust particles float in warm afternoon sunlight streaming through a window. "
            "Shallow depth of field, 24fps cinematic look"
        ),
    }],
    resolution="1080p",
    duration=15,
)

# Get the video URL from the response
video_url = response.output[0].url
print(f"Video URL: {video_url}")

Both APIs follow a similar pattern: submit a prompt, get back a video. But the differences go beyond just the endpoint.

Async vs sync: The EvoLink API for Seedance is asynchronous — you submit a task and poll for completion (or use a webhook callback). Sora via OpenAI returns directly. For production pipelines processing many videos, the async pattern is often preferable since you can submit batches without blocking.

Input flexibility: Seedance's @-reference system lets you combine up to 9 images, 3 videos, and 3 audio tracks in a single prompt. You can say "@Image1 as first frame, replicate @Video1 camera movement, sync to @Audio1 beat." Sora 2 supports image input but doesn't offer this kind of multimodal composition.

Output options: Seedance lets you toggle audio generation on or off per request, choose from six aspect ratios (including 21:9 ultrawide), and select 480p/720p/1080p resolution. Sora offers fewer output configuration options but delivers higher default resolution.

Video URL expiry: EvoLink video URLs expire after 24 hours — download or cache them immediately. Plan your pipeline accordingly.

Pricing Breakdown

Cost per 15-second video at default settings, as of February 2026:

Sora 2 (via OpenAI / EvoLink)

That works out to $0.10/second at 720p standard tier. Our 15-second test videos cost approximately $1.50 each on Sora 2.

Source: seedance2api.app/pricing, as of Feb 2026

Seedance 2.0 (via EvoLink)

Pricing coming soon. Seedance 2.0 pricing will be announced at launch. The model supports 480p, 720p, and 1080p output with optional audio generation.

For context, here's how it stacks up against other models in the market:

Source: seedance2api.app/pricing

Get early access to lock in launch pricing when it's announced.

Cost Considerations

• Resolution tradeoff: Seedance at 720p costs less than Sora at 1080p, but delivers 60fps vs 30fps. Depending on your use case, the higher frame rate may be more valuable than the higher resolution.
• Audio bundling: Both models can generate synchronized audio. Factor this into your per-video cost if you'd otherwise need separate audio generation.
• Volume matters: For production workloads generating hundreds of videos, even small per-second differences compound. Test both with your actual prompts before committing.
• Intellectual property: Seedance 2.0 outputs include commercial usage rights — verify the latest terms for your use case.
• Hidden costs: Don't forget bandwidth, storage, and post-processing. Sora's higher resolution means larger file sizes (~2× per frame). If you're serving these videos to end users, CDN costs scale with file size. Seedance's 60fps means more frames per second but at lower resolution, resulting in comparable file sizes.
• Free tier testing: Before committing to either API for production, run your actual prompts through both. The results from these three prompts may not generalize to your specific content domain. EvoLink offers a free API key to get started with Seedance testing.

When to Choose Which

Picking a model isn't about "which is better" — it's about matching capabilities to your specific use case.

Choose Seedance 2.0 when:

• Dynamic human content — dance, sports, action, fitness. The anatomy accuracy gap (8.5 vs 6.5 in our test) is significant.
• Slow-motion or high-motion content — 60fps makes a visible difference in ads, product demos, and cinematic sequences.
• Character close-ups — facial detail and micro-expression rendering are more convincing, especially for elderly or highly detailed faces.
• Multimodal workflows — you need to combine reference images, videos, and audio in a single generation using the @-reference system.
• Rich environment scenes — Seedance builds more detailed, "lived-in" environments with more props and depth layers.
• Flexible aspect ratios — 21:9 ultrawide and 4:3 formats aren't available on Sora.

Choose Sora 2 when:

• Maximum resolution matters — if your output will be displayed at 1080p+ or screenshotted/paused frequently, Sora's higher pixel count wins.
• Object destruction physics — fracture detail on breaking objects is more convincing (uneven thickness, visible internal material layers).
• Static or slow-moving scenes — when the 60fps advantage doesn't apply, Sora's resolution advantage is uncontested.
• Existing OpenAI integration — if your stack already uses the OpenAI SDK, adding Sora requires minimal new infrastructure.

The hybrid approach

For production pipelines, consider using both. Generate character/motion content with Seedance 2.0 and object/environment establishing shots with Sora 2. Both APIs follow standard REST patterns, making it straightforward to route prompts based on content type.

A simple routing heuristic based on our test results:

def choose_model(prompt: str, needs_pause_quality: bool = False) -> str:
    """Route to the better model based on content type."""
    motion_keywords = ["dance", "run", "fight", "sport", "action", "slow motion", "jump"]
    face_keywords = ["close-up", "expression", "portrait", "face", "emotion", "elderly"]
    
    prompt_lower = prompt.lower()
    
    if any(kw in prompt_lower for kw in motion_keywords):
        return "seedance-2.0"  # Better anatomy + 60fps
    if any(kw in prompt_lower for kw in face_keywords):
        return "seedance-2.0"  # Better facial detail
    if needs_pause_quality:
        return "sora"          # Higher resolution for screenshots
    return "seedance-2.0"      # Default to higher overall score

This is intentionally simplistic — your production router would use more sophisticated classification. But the principle holds: match the model to the content's primary requirement.

What about other models?

This comparison focused exclusively on Seedance 2.0 and Sora 2 because they represent the current production-grade tier of AI video APIs. Other models like Runway Gen-3, Pika, and Kling are viable alternatives but weren't included in this specific test. We may cover broader comparisons in future articles.

FAQ

Is Seedance 2.0 better than Sora 2?

In our tests, Seedance 2.0 scored higher overall (8.5 vs 8.0), with particular strengths in human anatomy accuracy, motion fluidity (60fps), lighting, and facial detail. Sora 2 wins on resolution and object fracture physics. Neither is universally "better" — it depends on your content type.

Can I access Seedance 2.0 through an API?

Yes. Seedance 2.0 is available through the EvoLink API with standard REST endpoints. It supports text-to-video, image-to-video, and video-to-video generation. Get an API key here.

What's the actual output quality difference at 720p?

At matched 720p resolution, Seedance delivers 60fps while Sora delivers 30fps. This means Seedance produces twice as many frames per second, resulting in noticeably smoother motion — especially in fast-moving scenes. For static content, the visual quality is comparable at the same resolution.

Do both models generate audio?

Yes. Both Seedance 2.0 and Sora 2 can generate synchronized audio including voice, sound effects, and background music. Seedance allows you to control audio generation with a generate_audio parameter and can align output to reference audio tracks via the @Audio tag.

Which model is more cost-effective for production use?

It depends on volume and content type. Sora 2 standard tier costs $0.10/second for 720p — a 15-second video runs about $1.50. Seedance 2.0 pricing hasn't been announced yet (coming at launch). Check seedance2api.app/pricing for the latest. If your content is motion-heavy, Seedance's 60fps at 720p may deliver better perceived quality per dollar than Sora's 30fps at the same resolution.

Can I use Seedance 2.0 outputs commercially?

Seedance 2.0 outputs through the EvoLink API include commercial usage rights, but terms vary. Read our detailed copyright and licensing guide for the full breakdown of what's allowed, including monetization on YouTube, use in client work, and redistribution rights. Always verify the latest terms before production deployment.

Final Scores

Both models represent the state of the art in AI video generation as of early 2026. Neither can generate floating dust particles. Neither produces perfect hands every time. But for production API use, these results should guide your model selection based on what you're actually building.

For the latest on Seedance model capabilities, see the official ByteDance Seed research page. For Sora documentation and updates, refer to OpenAI's official platform docs.