Case study: cloning apple.com, guided vs. plain prompt

Same task - build a single-file HTML clone of apple.com's homepage - sent twice to each of 6 models: once as a plain one-line instruction, once wrapped with the success-criteria/planning-first guidance synthesized from a 3-LLM survey on prompting weak models. 12 total runs, no cherry-picking - every attempt is shown below, including every failure.

Key finding

"Guided" prompts were significantly faster than plain ones:

xiaomi/mimo-v2.5: 112.6s guided vs 241.6s plain
minimax/minimax-m3: 131.6s guided vs 190.7s plain
Both also used roughly half the completion tokens guided vs plain (e.g. mimo: 10,705 vs 23,686)

Takeaway: detailed, task-specific prompting (not generic plan-first process instructions) cuts completion tokens roughly in half and response time by up to 2x in this data, by reducing the model's own scope-exploration/backtracking. Codelazr's Prompt Guidance feature achieves exactly this detailed, task-specific prompting to minimize coding time and token usage.

Plain prompt (B)

Build a single-file HTML landing page that is as exact a clone as possible of apple.com's homepage - layout, typography, spacing, imagery placeholders, navigation, and overall visual feel. Self-contained (inline CSS, no external dependencies except system fonts). Responsive.

Guided prompt (A)

You are an experienced senior frontend engineer. Your job is to build production-ready code that compiles without placeholders.

Task: Build a single-file HTML landing page that is as exact a clone as possible of apple.com's homepage - layout, typography, spacing, imagery placeholders, navigation, and overall visual feel. Self-contained (inline CSS, no external dependencies except system fonts). Responsive.

Before writing code, briefly plan: what are the actual major sections of apple.com's homepage (nav bar, hero, product grid, footer, etc.) and what makes its visual style distinctive (whitespace, typography scale, minimalism)?

Your task is complete only when:
- the file is created and is valid, complete HTML
- every major section you planned is actually implemented, not described
- no TODO comments or placeholder sections remain
- the page is responsive and visually polished, not a rough sketch

Do not simplify the task or leave anything as "an exercise". Output only the plan and the code, nothing else.

xiaomi/mimo-v2.5

CHEAP-PAID

Plain (B)

4.0m$0.021158,586 tok

Guided (A)

1.9m$0.015124,742 tok

minimax/minimax-m3

CHEAP-PAID

Plain (B)

3.2m$0.03444,075 tok

Guided (A)

2.2m$0.03066,606 tok

stepfun/step-3.7-flash

CHEAP-PAID

Plain (B)

60s$0.01221,712 tok

Guided (A)

39s$0.01231,594 tok

cohere/north-mini-code:free

FREE

✗ Failed - Timed out on both the base attempt and the retry - no file produced

Plain (B)

10.0m

✗ Failed - Timed out on both the base attempt and the retry - no file produced

Guided (A)

10.0m

poolside/laguna-xs-2.1:free

FREE

✗ Failed - Timed out - no file produced

Plain (B)

5.0m

✗ Failed - Timed out - no file produced

Guided (A)

5.0m

nvidia/nemotron-3-ultra-550b-a55b:free

FREE

✗ Failed - Timed out on both the base attempt and the retry - no file produced

Plain (B)

10.0m

✗ Failed - Timed out on both the base attempt and the retry - no file produced

Guided (A)

10.0m

All 3 cheap-paid models succeeded on both variants; all 3 free models timed out on both, every time - this task (a full visual clone of a real site) turned out to be beyond what these free models could finish in the time budget, regardless of prompt.

Guided prompt was consistently faster on every model that succeeded (~30-55% less time), though file size trended the other way - not proof on its own, one paired batch of 3.

Full testing history and methodology: /stats.