Opus 5.5 motion design: workflow and API costs

What does the motion-design workflow contain?

1. Define dimensions, duration, frame rate, content and acceptance criteria.
2. Ask the model for animation code with a deterministic timeline.
3. Review and render the code in an isolated environment without production credentials.
4. Capture frames, encode the result and inspect the complete exported video.

Keep code generation separate from export. A browser preview can look correct while frame capture skips an animation or external assets fail to load. Require reproducible frame timing and a known renderer version. Do not execute generated code with access to private files, service keys or unrestricted network resources.

Which model and API do I use?

The Anthropic model catalog identifies claude-opus-5-5 with text output. The routed OpenRouter identifier uses different punctuation: anthropic/claude-opus-5.5. Do not interchange them between providers.

Use this Messages API request as a starting point. It asks for an eight-second animation, not an eight-second video response. The code and any renderer configuration still need inspection. The returned answer may need revisions before it can be safely captured.

curl --fail-with-body https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-opus-5-5",
    "max_tokens": 4096,
    "messages": [{"role": "user", "content": "Write a self-contained HTML animation: 8 seconds, 1280x720, three labeled bars. No network requests or external assets. Define deterministic frames for capture. Return code only."}]
  }'

How much does an animation request cost?

Use the current Claude Opus 5.5 model record for standard rates: input $4.00, output $20.00, cache reads $0.20 per million tokens, verified 2026-10-03. These are not fast-mode rates.

For an illustrative request with 10,000 fresh input tokens and 5,000 output tokens, the standard text subtotal is $0.14. This is arithmetic, not measured usage or a quote per completed video. Rendering, encoding, retries and storage are additional. Cache-write pricing has separate duration tiers; the calculator's cached-input field represents reads, not writes.

How should I compare Opus 5.5 with an older version?

Use identical briefs, rendering constraints and scoring rules. Match duration, resolution and asset policy. A lower per-token rate is not a guaranteed lower finished-video cost if the new workflow takes more correction rounds. Record all generated output, including discarded attempts.

Compare the standard input, output and cache-read fields in the model records, then use actual usage from each response. A version-to-version rate difference is not a historical repricing event. The new model begins with a sourced baseline; its future channel changes are recorded separately in price history.

What would count as a successful test?

For motion design, add renderer checks: the timeline starts correctly, every required label remains legible, there are no missing assets, and frames at the start, middle and end differ as intended. Inspect the exported file for duration, resolution and frame count. An accepted prompt or HTTP 200 is insufficient.

We did not call the model, run its generated code or export a model-generated video in this check. No render success rate, animation-quality score or API latency is claimed. Keep a separate log of prompt versions, corrective requests, tokens, failures and render time before publishing a benchmark.