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Vendor: Google Model ID: veo-3.1-fast Capability: 720p · up to 5s · text + image init · async via tasks API Pricing: per second, fast tier (live rate) Veo 3.1 Fast is the iteration variant. Same Veo motion strengths (natural-world footage, coherent physics) capped at 720p / 5s, with turnaround typically under 30 seconds. Right pick for prompt design, draft passes before committing to Veo 3.1, and any UX where the user clicks “generate” and is watching the clock.

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Submit

curl https://llm.bytespike.ai/v1/tasks/submit \
  -H "x-api-key: $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "veo-3.1-fast",
    "prompt": "Slow zoom into a bowl of ramen, steam rising.",
    "duration_seconds": 4,
    "resolution": "720p"
  }'

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Body parameters

FieldTypeRequiredDefaultNotes
modelstringyes—veo-3.1-fast
promptstringyes—English-tuned.
duration_secondsintegeryes—1–5.
resolutionstringno720pOnly 720p supported.
aspect_ratiostringno16:916:9 / 9:16 / 1:1.
seedintegerno—Reproducibility.
image_initstringno—URL of init image.

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Submit + poll

// Submit response
{"task_id": "task_…", "status": "queued", "estimated_credits": 0.18}

// Completed response
{"task_id": "task_…", "status": "completed", "result": {"video_url": "https://cdn.bytespike.ai/vid/...", "duration_seconds": 4, "resolution": "720p"}, "credits": 0.18}
Recommended cadence: 1s for first 30s, then 2s up to 60s. Query is free.

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Code examples

curl https://llm.bytespike.ai/v1/tasks/submit \
  -H "x-api-key: $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{"model": "veo-3.1-fast", "prompt": "Slow zoom into ramen", "duration_seconds": 4, "resolution": "720p"}'

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Errors

CodeTriggerBilled?
400 / 401 / 402 / 403StandardNo
451Prompt blocked by upstream safetyNo
5xxUpstream issueNo (auto-retry)

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When to use

  • Latency-sensitive UX where the user is watching the clock.
  • Prompt iteration before committing to a Veo 3.1 / Sora 2 final render.
  • For full-fidelity 1080p, see Veo 3.1.
  • For ByteDance fast tier, see Seedance Fast.

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Limits

LimitValue
Max duration5s
Min duration1s
Resolutions720p only
Aspect ratios16:9, 9:16, 1:1
Supports image initYes
Typical latency for 4s clip20-40s
Async via tasks APIYes