Introduction
Sora is OpenAI's flagship AI video generation model and one of the benchmark products in the AI video field. Sora 2 was officially released on September 30, 2025, which OpenAI CEO Sam Altman called the "ChatGPT 3.5 moment for creativity."
Try Sora's video generation workflows on FuseAI Tools: /home/sora — Text to Video and Image to Video.
Sora's core positioning: generate high-definition video with strong physical realism, coherent motion, and synchronized sound from text or images. Unlike many tools that only generate silent footage, Sora 2 generates audio and video synchronously — producing dialogue, sound effects, and background music alongside the visuals.
Sora stands out for its adherence to real physics. Early AI video models distorted reality to satisfy prompts (a basketball would fly into the hoop even when it missed). In Sora 2's output, the ball bounces off the backboard and pops out, following real physics. This makes Sora's videos clearly more believable than its predecessors and most competitors.
Note: In 2026, OpenAI announced Sora's retirement timeline: Sora web and app access ended on April 26, 2026, and the API is scheduled to terminate on September 24, 2026. As OpenAI's pioneering product in video generation, Sora's technical philosophy and methodology deeply influenced the industry. This article remains a complete reference for understanding this classic model.
II. From Sora 1 to Sora 2: The Evolution
2.1 Sora 1 (2024)
Sora's prototype first appeared in February 2024, initially tested only by a handful of creators and researchers. In December of that year, it gradually opened to ChatGPT Plus and Pro users in some regions. Early Sora could generate video but had obvious physics errors and incoherent motion. In a classic test case, the model couldn't correctly identify a chair's position in a scene, making the chair emerge from dust or even float in the air.
2.2 Sora 2 (September 2025)
Sora 2's release marked the product's move from "technical preview" to "usable creative tool." Key upgrades include:
| Dimension | Sora 1 | Sora 2 |
|---|---|---|
| Audio generation | Not supported | Supports dialogue, sound effects, background music |
| Video duration | Plus: 5/10s; Pro: 5/10/15/20s | Up to 15s for all users; up to 25s for Pro |
| Editing features | Remix, re-cut, storyboard, loop, blend, preset styles | Remix, storyboard, Cameo; text-described arbitrary styles |
| Community features | Likes only | Likes, comments, follows |
| Generation quota | Calculated monthly | Daily quota of 30 clips within 24 hours |
Sora 2's most important breakthroughs are synchronized audio-video generation and a major leap in physical realism. The model is no longer just a "picture generator" but a one-stop short-video creation tool.
III. Sora 2 Core Features Explained
3.1 Text-to-Video
Users input a text description and the model generates corresponding video content. Sora 2 is especially strong at cinematic, photorealistic, and anime-style imagery. The prompt limit is generous, accommodating detailed scene, action, lighting, and camera descriptions.
3.2 Image-to-Video
Users upload an image as a visual reference, and the model generates a dynamically extended video based on it. This locks in character design, costume, set, or overall aesthetic style. The model uses the image as the first-frame anchor, while the text prompt describes what happens next.
Image-to-video requirements:
- Image resolution must match the target video dimensions
- Supported formats: image/jpeg, image/png, image/webp
3.3 Video-to-Video
Users upload an existing video clip, and Sora 2 can extend or modify it — for example, adding visual effects to an existing edit or changing its style. This suits secondary creation and iterative adjustments of existing assets.
3.4 Remix
Sora 2 introduces the ability to remix existing videos through targeted adjustments, rather than regenerating from scratch. Users can precisely edit an existing video, keep the parts they like, and adjust only specific elements.
3.5 Audio and Dialogue Generation
A core differentiator for Sora 2 versus most competitors:
- Dialogue generation: write character lines directly in the prompt; the model generates speech roughly synced to lip movements. It's recommended to use
<dialogue>tags in the prompt to separate dialogue from scene description. - Sound effect generation: ambient sounds, action effects, and more
- Background music: auto-composed based on the video's emotional tone
Keep dialogue concise: a 4-second shot usually fits 1 to 2 short lines; an 8-second shot can support more. Overly long speeches tend to cause sync issues.
3.6 Cameo
Cameo is the Sora App's most distinctive feature. Users record a short personal face video for verification, create their own virtual digital avatar (Cameo), and then "place" that avatar into AI-generated scenes for realistic on-camera effects. Sora automatically writes dialogue and actions for the Cameo character based on the scene.
Cameo also supports using other users' public avatars, automatically @-mentioning the creator when generating video. This gives Sora unique interactivity and viral potential in social media scenarios.
3.7 Storyboard and Cross-Shot Consistency
Sora 2 excels at maintaining consistency in characters, costumes, and props across shots. Users can ensure coherence across multiple shots through detailed descriptions:
- Costume and prop consistency: explicitly specify the clothing and accessories characters wear
- Emotional arc tracking: describe how characters' emotions change across shots
- Environmental continuity: keep iconic background elements consistent across shots
IV. Sora vs Mainstream AI Video Tools
| Comparison Dimension | Sora 2 | Veo 3.1 | Runway Gen-3 | Kling |
|---|---|---|---|---|
| Max resolution | 1080p | 1080p | 1080p | 1080p |
| Max duration | 25s (Pro) | 8s | 10s | 10s |
| Native audio | Supported | Supported | Not supported | Not supported |
| Physical realism | ★★★★★ | ★★★★★ | ★★★ | ★★★ |
| Character consistency | Excellent | Supported | Limited | Limited |
| Cameo feature | Exclusive | Not supported | Not supported | Not supported |
| Availability | Retired (2026.4) | Paid preview | Publicly available | Publicly available |
Overall assessment:
- Sora 2 leads in physical realism and cross-shot coherence. Its synchronized audio-video generation and Cameo feature give it a unique advantage in social scenarios — but its availability has entered the retirement window, so it's unsuitable as the core of a long-term production pipeline.
- Veo 3.1 is equally strong in physics simulation and native audio, and remains in paid preview.
- Runway Gen-3 wins with mature workflows and reference consistency, suitable for agencies needing brand consistency.
- Kling offers the best value and has high penetration among Chinese-speaking users.
V. Usage Tutorial
Sora is accessible via web and iOS App. The following uses the web version to demonstrate the main workflow.
5.1 Preparation
- A valid OpenAI account (ChatGPT Plus or Pro subscription)
- Users in some regions need an invitation code for access
- The App must be downloaded from the US App Store (restricted in some regions)
5.2 Choose the Input Mode
| Input Type | Best For | Example |
|---|---|---|
| Text-only prompt | Creating entirely new scenes from description | "A cat playing piano in a jazz bar" |
| Image + text prompt | Animating a static image | Turning a product photo into a dynamic showcase |
| Video + text prompt | Extending or modifying an existing clip | Adding visual effects to an existing edit |
5.3 Write the Prompt
Sora 2's best practice is a multi-sentence structured description:
[Scene setup] + [Subject description] + [Action/Behavior] + [Camera movement] + [Lighting] + [Physics details] + [Dialogue/Audio] + [Atmosphere]
Concise example: "Medium shot. A 28-year-old woman in green silk attire walks through a 1990s Hong Kong neon street. Practical neon lighting from the left. Wet pavement reflects colored light. She gently touches a jade bracelet. At 0:06 she says 'I've walked this street for ten years,' lip-synced, a melancholy whisper. Camera pans to follow. 35mm lens, f/1.8, background blur. Nostalgic warm yellow tones, teal-blue shadows."5.4 Configure Parameters
- Duration: choose 10 or 15 seconds (up to 25 seconds for Pro)
- Aspect: Sora 2 supports 1280x720 or 720x1280; Sora 2 Pro additionally supports 1024x1792 or 1792x1024
- Generation count: up to 3 variants at once
5.5 Generate and Iterate
Click generate and the system processes the request. Generation time depends on video length and server load. Finished videos can be previewed, downloaded, or shared in the Sora community.
If the result is close but needs tweaks, use Remix for targeted modification rather than regenerating. Iteration advice: change only one variable at a time; once close to the result, pin it as a reference and describe only the part needing adjustment.
VI. Prompting Tips and Examples
6.1 Five Core Techniques
Technique 1: Describe action in "beats." Motion is the hardest part of video generation. Breaking action into countable steps and beats lets the model understand timing more precisely.
- Poor: "The actor walks across the room."
- Better: "The actor takes four steps toward the window, pauses, and pulls the curtain in the final second."
Technique 2: Specify lighting and color. Describe light quality and color anchors rather than vaguely saying "bright room." Specifying 3 to 5 colors as palette anchors ensures consistency across shots.
- Poor: "Lighting and palette: a bright room."
- Better: "Soft window light with warm lamp fill, cool edge light in the hallway. Palette anchors: amber, cream, walnut brown."
Technique 3: Mark dialogue and audio separately. Put dialogue in <dialogue> tags so the model clearly distinguishes scene description from lines.
Technique 4: Keep actions simple. Focus each video on one clear camera movement and one clear subject action. Multiple complex actions at once easily cause physics distortion.
Technique 5: Focus on motion in image-to-video. After inputting an image, the prompt should only describe the motion you want to add, not re-describe existing content.
6.2 Full Prompt Example
Here is the complete structure of a 10-second prompt:
=== SHOT 01: Opening Scene ===
TIME: 0:00 - 0:10 (10 seconds)
SCENE SETUP:
1990s Hong Kong night street, neon signs flashing (magenta, cyan, orange). Wet pavement reflects colored light, thin fog drifts across the ground.
SUBJECT:
A 28-year-old woman in green silk traditional attire and a sheer gauze robe. A jade bracelet on her left wrist, a jade hairpin on the right side of her loose bun.
ACTION:
She walks slowly down the street, melancholic. Her hand gently touches the jade bracelet (about 30g, catching neon light).
CAMERA:
Medium shot, lateral pan following. 35mm lens, f/1.8 (shallow depth of field, background neon blurred into bokeh).
LIGHTING:
Practical neon as key light (3200K warm). Left-side light creating an edge light on her silhouette. Wet street as fill (reflected light).
DIALOGUE:
At 0:06 she says "I've walked this street for ten years," lip-synced, soft melancholy tone, almost a whisper.
AUDIO:
- Background: distant firecrackers, street noise (ambience)
- SFX: high-heel footsteps every 0.8 seconds
- SFX: jade bracelet clicks softly at 0:07
- Music: nostalgic jazz piano (dips during dialogue)
ATMOSPHERE:
Nostalgic, cinematic. Warm yellow midtones, teal-blue shadows, saturation -20% (faded look). 35mm film grain. Slight handheld feel.VII. Character Consistency and Cameo
7.1 Characters API
Sora 2's Characters API lets users create reusable characters from short video clips, keeping appearances consistent in later generations.
Character creation requirements:
- MP4 video format
- 2 to 4 seconds long
- 720p to 1080p resolution
- 16:9 or 9:16 aspect ratio
After creating a character, reference it by character ID in future generations, and refer to the character by name in the prompt. It's recommended to use no more than 2 characters per generation.
7.2 Cameo Workflow
Cameo is Sora App's productized combination of character consistency and social media:
- Record a short personal face video in the App (similar to identity verification)
- The system generates a dedicated virtual digital avatar for the account
- Enter @username in the prompt to place the corresponding avatar into the scene
- Sora automatically generates matching dialogue and actions for the character
Users can decide whether to make their Cameo avatar public. Once public, other users can use the avatar to generate videos and automatically @ the original creator. This mechanism quickly spawned a wave of "fan-verse" creations after the Sora App launched: anime characters crossing real streets, celebrities appearing in bizarre scenes, and more.
VIII. Use Cases and Limitations
8.1 Use Cases
- Social media shorts and meme creation: the Sora App's interface resembles a short-video platform with browsing, likes, comments, and follows, forming an independent short-video community. Cameo lets users place their virtual avatar into AI scenes with huge viral potential.
- Cinematic narratives and concept prototypes: Sora 2 leads in cross-shot coherence, physical realism, and cinematic light control — ideal for brand ad creative prototypes, game trailer concept validation, and storyboard previews.
- Multi-shot content needing character consistency: the Characters API lets creators reuse characters, ensuring consistent appearances across scenes and shots — suited to serialized short-video creation.
- Rapid creative iteration: Remix lets creators keep satisfying parts and adjust only specific elements, greatly improving iteration efficiency.
8.2 Limitations
- Availability has entered the retirement window: per OpenAI's announcement, Sora web and app access ended in April 2026, with API support continuing until September 2026. Sora is no longer suitable as the production tool for long-term pipelines or commercial projects.
- Low user retention: a16z partner data shows Sora's day-1 retention is only about 10%, and 30-day retention about 1% — far below TikTok's 50% and 32%. This reflects the ongoing challenge of converting AI video tools from "fun" to "useful."
- Generation stability still needs work: despite major improvements in Sora 2, users still encounter limb distortion, disappearing objects, and broken physics. Official demos are often "one in a hundred" results; "gacha failure" is still common in ordinary users' actual generation.
- Ethics and copyright disputes: the Sora App quickly triggered copyright controversies. Many users generated videos with well-known IP characters, drawing attention from the Japanese government and rights holders. Famous YouTuber MrBeast also warned this could be "the scariest period for the content industry."
IX. FAQ
Q1: Can Sora still be used now?
Sora's web and app access ended on April 26, 2026. The API is scheduled to terminate on September 24, 2026. Developers and technical researchers can still run technical evaluations and experiments before the API shuts down. But Sora is unsuitable as the core tool for new commercial projects or long-term content production pipelines.
Q2: What's the difference between Sora 2 and Sora 1?
Sora 2's core upgrades: new audio and dialogue generation, longer durations (up to 25 seconds), the Cameo feature, the Remix feature, and better physical realism and cross-shot consistency. The generation quota system also changed from monthly to a 24-hour daily quota.
Q3: What input modes does Sora 2 support?
Three modes: text-to-video (pure text description), image-to-video (upload a reference image with a text prompt), and video-to-video (upload an existing video to extend or modify).
Q4: How capable is Sora 2's audio generation?
Sora 2 synchronously generates dialogue, sound effects, and background music. Dialogue must be explicitly labeled with tags in the prompt, and lines should stay concise so the model can achieve lip sync.
Q5: What is the Cameo feature?
Cameo is a Sora App signature feature. Users record a personal face video to create a virtual digital avatar, then "place" themselves into AI scenes during generation. Sora automatically generates matching dialogue and actions based on the scene.
Q6: Do Sora prompts have special requirements?
Sora 2 recommends multi-sentence structured descriptions covering scene setup, subject description, action, camera movement, lighting, physics details, dialogue, and audio. Dialogue should use <dialogue> tags to separate from scene description. Actions should be described in "beats" for precise timing.
Q7: Can Sora 2 keep characters consistent across videos?
Yes. The Characters API lets users upload a 2 to 4 second character reference video to create a character, then reference it by character ID in later generations. Detailed costume, prop, and hairstyle descriptions also maintain consistency across shots.
Conclusion
Sora is one of the most iconic products in AI video generation. From its stunning concept debut in 2024, to Sora 2's comprehensive upgrades in 2025 — synchronized audio-video generation, physical realism, and the Cameo social feature — Sora defined the industry standard for AI video generation in just two years.
Sora 2's biggest breakthrough: moving AI video generation from "pasting pictures together" to "building scenes." The model no longer just assembles pixels from keywords; it constructs a believable, coherent visual world grounded in an understanding of physics, spatial relationships, and narrative rhythm. That's why Sam Altman called it the "ChatGPT 3.5 moment for creativity."
Sora's other major contribution was expanding AI video generation from a purely technical tool into a social creation platform. Through Cameo, Remix, and community features, Sora validated the potential of AI video tools in UGC scenarios.
Note that Sora as a product has entered its retirement window. But in today's rapidly evolving AI landscape, the technical paths Sora established — physical realism, synchronized audio-video, character consistency — have become important reference points for subsequent video models. Its value to creators and researchers far outlives Sora's own lifecycle.
To explore video generation workflows today, start from the Sora hub on FuseAI Tools: Text to Video, Image to Video, and Pro Storyboard.