Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Sailboat riding animated waves in one self-contained HTML file

[
 {
  "duration_api_ms": 43135,
  "stop_reason": "end_turn",
  "session_id": "[REDACTED]",
  "total_cost_usd": 0.201637,
  "usage": {
   "input_tokens": 10,
   "cache_creation_input_tokens": 11230,
   "cache_read_input_tokens": 97485,
   "output_tokens": 4613,
   "output_tokens_details": {
    "thinking_tokens": 244
   },
   "server_tool_use": {
    "web_search_requests": 0,
    "web_fetch_requests": 0
   },
   "service_tier": "standard",
   "cache_creation": {
    "ephemeral_1h_input_tokens": 11230,
    "ephemeral_5m_input_tokens": 0
   },
   "inference_geo": "global",
   "iterations": [
    {
     "input_tokens": 2,
     "output_tokens": 483,
     "cache_read_input_tokens": 23069,
     "cache_creation_input_tokens": 307,
     "cache_creation": {
      "ephemeral_5m_input_tokens": 0,
      "ephemeral_1h_input_tokens": 307
     },
     "type": "message"
    }
   ],
   "speed": "standard",
   "fallback_credit": null
  },
  "modelUsage": {
   "claude-opus-5-5": {
    "inputTokens": 10,
    "outputTokens": 4613,
    "cacheReadInputTokens": 97485,
    "cacheCreationInputTokens": 11230,
    "webSearchRequests": 0,
    "costUSD": 0.201637,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 244,
    "canonicalModel": "claude-opus-5-5",
    "provider": "firstParty",
    "costBasis": "list"
   }
  },
  "permission_denials": [],
  "terminal_reason": "completed",
  "fast_mode_state": "off",
  "fast_mode_disabled_reason": "sdk_opt_in_required",
  "subagent_stats": {
   "spawned": 0,
   "requested": {
    "background": 0,
    "foreground": 0,
    "unset": 0
   },
   "started_in_background": 0,
   "max_depth": 0,
   "spawned_by_subagents": 0,
   "completed": 0,
   "failed": 0,
   "killed": {
    "parent": 0,
    "user": 0,
    "system": 0
   },
   "refused": {
    "depth_limit": 0,
    "concurrency_limit": 0,
    "budget": 0
   },
   "by_type": {}
  },
  "safety_stops": 0,
  "is_error": false,
  "num_turns": 5,
  "subtype": "success",
  "api_error_status": null,
  "result": "I wrote `sailboat.html` (about 5.6 KB). It shows a sailboat rocking on four layers of moving waves at sunset, with twinkling stars, drifting clouds, the sun's reflection shimmering on the water, a flapping pennant and lines of foam.\n\nHow it meets each check:\n1. **Size:** about 5.6 KB, well under the 100 KB limit.\n2. **No external requests:** everything is inline. A search found no `//`, `http`, `import` or `fetch` anywhere in the file, and there's no inline SVG, so no `xmlns` URL either.\n3. **Animation:** it uses `requestAnimationFrame` on a canvas, plus a CSS `@keyframes` animation on the caption.\n4. **Loops forever:** the animation loop never stops (there's no `cancelAnimationFrame` or `clearInterval`), and the caption's CSS animation is set to `infinite`.\n5. **Page animates:** I took headless Chrome screenshots at 800x600 at 1.5 s and 2.5 s, and they differ.\n6. **ID and title:** the canvas has `id=\"sailboat\"` and the title is \"Sailboat at Sunset\".\n\nAfter those tests I made one small change: the boat now tilts only 60% as much as the wave slope, because it was leaning too steeply. I didn't re-run the browser screenshots after that change. It only affects how far the boat tilts, not the animation loop or any of the checked content.",
  "ttft_ms": 3370,
  "type": "result",
  "duration_ms": 44767,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1757,
  "time_to_request_ms": 303,
  "first_content_frame_ms": 1757,
  "queued_turn_count": 0,
  "result_index": 0
 }
]