Claude Sonnet 5.5 on Build a 4-page bakery-cafe website (HTML/CSS)

AClaude Sonnet 5.5 · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-14 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.16
Wall time: 54s
Human step-ins: 0
Outcome: Pass

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Exact prompt

Build a complete static website for "Harbor & Pine", a family-run bakery-cafe in Portland, Maine. Output files in this directory: index.html, menu.html, about.html, contact.html, and styles.css (shared). Every page shares the same nav (links to all 4 pages) and footer (address: 41 Fore St, Portland, ME 04101; hours Tue-Sun 7am-3pm). index.html: hero, 3 signature items, testimonial section. menu.html: at least 3 categories (Breads, Pastries, Coffee) with at least 4 items each including prices. about.html: story and a team section with 3 people. contact.html: a form with name, email, message fields and an embedded-map placeholder. Responsive (mobile media query). No JS frameworks, no external images (use CSS or inline SVG). Do it in one pass.

Task prompt given to the agent (headless, offline, synthetic fixture inputs): Build a complete static website for "Harbor & Pine", a family-run bakery-cafe in Portland, Maine. Output files in this directory: index.html, menu.html, about.html, contact.html, and styles.css (shared). Every page shares the same nav (links to all 4 pages) and footer (address: 41 Fore St, Portland, ME 04101; hours Tue-Sun 7am-3pm). index.html: hero, 3 signature items, testimonial section. menu.html: at least 3 categories (Breads, Pastries, Coffee) with at least 4 items each including prices. about.html: story and a team section with 3 people. contact.html: a form with name, email, message fields and an embedded-map placeholder. Responsive (mobile media query). No JS frameworks, no external images (use CSS or inline SVG). Do it in one pass. Inspired by https://x.com/He1s_Sammy/status/2082864146010275884 (unverified; not checked with the author). This is an independent re-run on a reproducible synthetic task; it does not report or reproduce the original post's numbers. Cost shown is a list-price API-equivalent estimate (run on a Claude Pro subscription, not billed).

Success criteria: All automated rubric checks pass: index.html exists; menu.html exists; about.html exists; contact.html exists; styles.css exists and linked on all pages; nav links to all 4 pages on every page; footer address+hours on every page; menu has Breads/Pastries/Coffee with prices (>=12 prices); contact form name/email/message; mobile media query; no external images.

Setup notes: Cost is an ESTIMATE: Claude Code's list-price API-equivalent figure. The run used a Claude Pro subscription, so nothing was billed. input_tokens = all input incl. cache-creation and cache-read tokens; cached_tokens = cache reads (subset of input). Claude Code's cost bills cache writes at the 1h cache-write premium, so it can differ from a flat input-price recompute. Web disabled; tools Read/Write/Edit/Glob/Grep/Bash; single run; scored automatically (11/11 checks).

Estimated cost List-price estimate; not actually billed.

Metrics

Estimated cost: $0.16
Wall time: 54s
Human step-ins: 0
Turns: 6

Model usage
Model	Input tok	Output tok	Cost
AClaude Sonnet 5.5anthropic/claude-sonnet-5.5	45,590	9,439	$0.16

Reproduce this run

Use the use case prompt on the use case page.
Same setup: Claude Sonnet 5.5 (anthropic/claude-sonnet-5.5) via Claude Code 2.1.299 (headless -p), cloud.
It counts as a success only if it meets every success criterion: All automated rubric checks pass: index.html exists; menu.html exists; about.html exists; contact.html exists; styles.css exists and linked on all pages; nav links to all 4 pages on every page; footer address+hours on every page; menu has Breads/Pastries/Coffee with prices (>=12 prices); contact form name/email/message; mobile media query; no external images.
Log model, tokens, wall time, human step-ins and the evidence log, then submit it as a reproduction. A different model? Submit a head-to-head rerun.

How runs are scored: Methodology.

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Automated checks

Trust 80% comes from these checks (how Trust % works).

Run date is not in the future : passed
Model is in the dated pricing table : passed
Cost recomputed from tokens matches : passed
Cached tokens are consistent : passed
Output throughput is plausible : passed
Autonomy matches step-ins : passed
Step-ins do not exceed turns : passed
Retries agree with first-try result : passed
Evidence log SHA-256 matches : passed
Evidence log is substantial : passed

Evidence log

{
 "duration_api_ms": 52440,
 "stop_reason": "end_turn",
 "session_id": "[REDACTED]",
 "total_cost_usd": 0.157207,
 "usage": {
  "input_tokens": 4,
  "cache_creation_input_tokens": 14936,
  "cache_read_input_tokens": 30650,
  "output_tokens": 9439,
  "output_tokens_details": {
   "thinking_tokens": 57
  },
  "server_tool_use": {
   "web_search_requests": 0,
   "web_fetch_requests": 0
  },
  "service_tier": "standard",
  "cache_creation": {
   "ephemeral_1h_input_tokens": 14936,
   "ephemeral_5m_input_tokens": 0
  },
  "inference_geo": "global",
  "iterations": [
   {
    "input_tokens": 2,
    "output_tokens": 483,
    "cache_read_input_tokens": 18111,
    "cache_creation_input_tokens": 9364,
    "cache_creation": {
     "ephemeral_5m_input_tokens": 0,
     "ephemeral_1h_input_tokens": 9364
    },
    "type": "message"
   }
  ],
  "speed": "standard",
  "fallback_credit": null
 },
 "modelUsage": {
  "claude-sonnet-5-5": {
   "inputTokens": 4,
   "outputTokens": 9439,
   "cacheReadInputTokens": 30650,
   "cacheCreationInputTokens": 14936,
   "webSearchRequests": 0,
   "costUSD": 0.157207,
   "contextWindow": 1000000,
   "maxOutputTokens": 128000,
   "thinkingTokens": 57,
   "canonicalModel": "claude-sonnet-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": 6,
 "subtype": "success",
 "api_error_status": null,
 "result": "I wrote all five files to `./usecase-runner/runs/14-sonnet/work`. I haven't opened them in a browser or checked them in any other way.\n\n- **Shared parts:** every page has the same nav linking to Home, Menu, About and Contact, with the current page highlighted. Every page also has the same footer with 41 Fore St, Portland, ME 04101 and Tue\u2013Sun 7am\u20133pm. `styles.css` is shared and includes a mobile media query at 720px that stacks the grids and nav.\n- **`index.html`:** a hero, three signature items (Pine Sourdough, Maine Blueberry Croissant, Harbor Latte) and a testimonials section with three quotes.\n- **`menu.html`:** Breads, Pastries and Coffee, with five priced items in each.\n- **`about.html`:** a two-paragraph story and a team section with three people.\n- **`contact.html`:** a form with name, email and message fields, plus a styled map placeholder.\n- **Images and JavaScript:** there are no external images or JavaScript. All the artwork is inline SVG or CSS.\n\n- **Invented content:** I made up the team members (Eleanor, James and Maya Calloway), the 2016 opening year, the testimonials, the menu items and the prices. Swap in your real details before publishing.\n- **Contact form:** the form's `action` is `#`, so submitting it does nothing yet. You'll need to point it at a form handler.",
 "ttft_ms": 1493,
 "type": "result",
 "duration_ms": 52838,
 "uuid": "[REDACTED]",
 "ttft_stream_ms": 910,
 "time_to_request_ms": 349,
 "first_content_frame_ms": 910,
 "queued_turn_count": 0,
 "result_index": 0
}