Rewrite · 5 checks · max 400 tokens · benched 2026-09-16

Gemini 3.1 Pro Preview vs Gemini 3.8 Flash vs Gemini 3.5 Flash Lite on rewrite a stiff notice in a friendly tone

Google models side by side on "Rewrite a stiff notice in a friendly tone": Gemini 3.5 Flash Lite scores 10/10; Gemini 3.5 Flash Lite is the cheapest answer scoring 8+ at $0.22 per 1,000 runs. Outputs, checks, judge reasons, latency and cost.

The prompt every model received

User

Rewrite the notice below in a warm, friendly, plain-English tone for a company-wide chat message. Keep every fact, including the date and time, in at most 80 words. Do not use the words "hereby" or "pursuant". Output only the rewritten message.

Notice: Staff are hereby informed that, pursuant to the scheduled electrical maintenance, the third-floor kitchen will be unavailable on Friday 3 October between 08:00 and 11:00. Alternative facilities are available on the second floor. Your cooperation is appreciated.

Rubric for the judge: Genuinely friendly tone, all facts kept (date, times, floor, alternative kitchen), under 80 words, no banned words.

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.

Gemini 3.1 Pro Preview

google/gemini-3.1-pro-preview

1/10

Latency: 2.3s
Cost: $0.00499
Per 1,000: $4.99

118 in · 396 out (382 reasoning) · 9 words · checks 3/5

max_words
contains
contains
not_contains
not_contains

Hi everyone! Just a quick heads-up that the third-floor

Judge: Output is incomplete and cuts off mid-sentence, failing to deliver the full rewritten message as required.

Gemini 3.8 Flash

google/gemini-3.8-flash

9/10

Latency: 1.4s
Cost: $0.00038
Per 1,000: $0.38

118 in · 79 out · 52 words · checks 5/5

max_words
contains
contains
not_contains
not_contains

Hi everyone! Just a quick heads-up: our third-floor kitchen will be closed this Friday, 3 October, from 08:00 to 11:00 for scheduled electrical maintenance. 

In the meantime, feel free to use the kitchen facilities on the second floor for your morning coffee or tea. 

Thanks so much for your patience and understanding!

Judge: Warm, friendly tone achieved; all facts preserved (date, times, floors, reason); 58 words well under limit; no banned words used; only minor issue is the slight addition of 'morning coffee or tea' which adds minor interpretation beyond stated facts.

Gemini 3.5 Flash Lite

google/gemini-3.5-flash-lite

10/10

top judge scorecheapest scoring 8+

Latency: 476ms
Cost: $0.00022
Per 1,000: $0.22

118 in · 75 out · 49 words · checks 4/5

max_words
contains
contains
not_contains
not_contains

Hi everyone! Just a quick heads-up that our third-floor kitchen will be closed for electrical maintenance on Friday, October 3rd, from 8:00 AM to 11:00 AM. 

While that's happening, feel free to use the alternative kitchen facilities on the second floor. Thanks so much for your patience and cooperation!

Judge: Perfectly rewrites the notice in warm, friendly plain English, includes all facts (date, time, floors, alternative facilities), stays well under 80 words (54 words), avoids banned words, and maintains genuine friendliness throughout.

Frequently asked

What does this prompt test?

Rewrite: Genuinely friendly tone, all facts kept (date, times, floor, alternative kitchen), under 80 words, no banned words. The deterministic checks are max_words, contains, 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, Gemini 3.5 Flash Lite at $0.22 per 1,000 runs. If you need the top score, Gemini 3.5 Flash Lite at $0.22 per 1,000 runs.

Same prompt, other families

Run it yourself

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