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Rewrite · 6 checks · max 400 tokens · benched 2026-09-16

Claude Opus 5 vs Claude Sonnet 5 vs Claude Sonnet 4.6 vs Claude Haiku 4.5 on jargon to plain english for a 12-year-old

Anthropic models side by side on "Jargon to plain English for a 12-year-old": Claude Haiku 4.5 scores 9/10; Claude Haiku 4.5 is the cheapest answer scoring 8+ at $0.38 per 1,000 runs. Outputs, checks, judge reasons, latency and cost.

The prompt every model received

User

Rewrite this paragraph so a 12-year-old would understand it. Keep it under 70 words and do not use the words "leverage", "synergy" or "paradigm". Output only the rewritten paragraph.

Paragraph: Our next-generation battery architecture leverages a solid-state electrolyte paradigm to achieve synergy between energy density and thermal stability, enabling a 40% increase in range while mitigating the combustion risk profile associated with legacy lithium-ion chemistries.

Rubric for the judge: Simple vocabulary, keeps the 40% range gain and the safety point, under 70 words, banned words absent.

Side by side

Every cell is one OpenRouter call at temperature 0 with the prompt's token cap and reasoning effort "low" where the model supports it. Cost is usage × the catalogue rate in models.json. Quality is one judge call to anthropic/claude-haiku-4.5 against the prompt's rubric, cached per prompt version.

Claude Opus 5

anthropic/claude-opus-5

9/10
Latency
1.1s
Cost
$0.00331
Per 1,000
$3.31

168 in · 99 out · 57 words · checks 6/6

  • max_words
  • contains
  • contains
  • not_contains
  • not_contains
  • not_contains
Our new battery uses a solid material inside instead of the liquid found in older lithium-ion batteries. That swap lets the battery store more energy and stay cooler at the same time. The result? Electric cars can drive 40% farther on one charge, and the battery is much less likely to catch fire than the older kind.

Judge: Excellent rewrite: simple vocabulary, includes 40% range gain and safety point, 59 words (under 70), no banned words, and accurately conveys the technical concept to a 12-year-old audience.

Claude Sonnet 5

anthropic/claude-sonnet-5

9/10
Latency
1.2s
Cost
$0.00107
Per 1,000
$1.07

168 in · 73 out · 41 words · checks 6/6

  • max_words
  • contains
  • contains
  • not_contains
  • not_contains
  • not_contains
Our new battery uses a solid material instead of liquid inside it. This makes it store more energy and stay cooler, giving cars 40% more range. It's also much safer than old batteries, since it's far less likely to catch fire.

Judge: Excellent simplification for a 12-year-old, includes the 40% range gain and safety benefit, avoids all banned words, and is 48 words (well under 70-word limit); only minor deduction for slightly simplified explanation of 'solid-state' concept.

Claude Sonnet 4.6

anthropic/claude-sonnet-4.6

9/10
Latency
734ms
Cost
$0.00131
Per 1,000
$1.31

116 in · 64 out · 53 words · checks 6/6

  • max_words
  • contains
  • contains
  • not_contains
  • not_contains
  • not_contains
Our new battery design uses solid materials instead of liquid inside, which makes it safer and less likely to catch fire compared to older batteries. It also stores more energy, meaning electric vehicles can travel 40% farther on a single charge. This is a big improvement over the batteries most devices use today.

Judge: Excellent rewrite: simple vocabulary, includes 40% range gain and safety benefits, avoids all banned words, and is 59 words (under 70 limit); only minor issue is slight loss of technical precision about solid-state electrolyte specifics.

Claude Haiku 4.5

anthropic/claude-haiku-4.5

9/10
top judge scorecheapest scoring 8+
Latency
749ms
Cost
$0.00038
Per 1,000
$0.38

116 in · 53 out · 41 words · checks 6/6

  • max_words
  • contains
  • contains
  • not_contains
  • not_contains
  • not_contains
Our new battery design uses a solid material instead of liquid to store energy better and stay cooler. This helps cars go 40% farther on one charge. It's also much safer than old batteries because it won't catch fire as easily.

Judge: Excellent rewrite: simple vocabulary, includes 40% range gain and safety benefit, 42 words (well under 70), avoids all banned words, and is age-appropriate for a 12-year-old.

Frequently asked

What does this prompt test?

Rewrite: Simple vocabulary, keeps the 40% range gain and the safety point, under 70 words, banned words absent. The deterministic checks are max_words, contains, contains, not_contains, not_contains, not_contains.

Which model should I pick for this task?

If the judge's bar of 8/10 is good enough for you, Claude Haiku 4.5 at $0.38 per 1,000 runs. If you need the top score, Claude Haiku 4.5 at $0.38 per 1,000 runs.

Same prompt, other families

Run it yourself

Re-run this prompt on Anthropic with your own OpenRouter key, or tweak the wording and see what changes.

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