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

Kimi K3 vs Kimi K2.7 Code vs Kimi K2.6 vs Kimi K2.5 on rewrite a stiff notice in a friendly tone

Moonshotai models side by side on "Rewrite a stiff notice in a friendly tone": Kimi K2.7 Code scores 10/10; Kimi K2.7 Code is the cheapest answer scoring 8+ at $0.25 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.

Kimi K3

moonshotai/kimi-k3

10/10

Latency: 1.1s
Cost: $0.00152
Per 1,000: $1.52

200 in · 92 out (17 reasoning) · 48 words · checks 5/5

max_words
contains
contains
not_contains
not_contains

Hi everyone! Just a heads-up — due to scheduled electrical maintenance, the third-floor kitchen won't be available on Friday 3 October, from 08:00 to 11:00. No worries though — you can use the kitchen facilities on the second floor in the meantime. Thanks so much for your cooperation!

Judge: Rewrite is warm and friendly, includes all facts (date, time, floors, alternative location), is 58 words, avoids banned words, and matches the rubric perfectly.

Kimi K2.7 Code

moonshotai/kimi-k2.7-code

10/10

top judge scorecheapest scoring 8+

Latency: 428ms
Cost: $0.00025
Per 1,000: $0.25

121 in · 48 out · 34 words · checks 5/5

max_words
contains
contains
not_contains
not_contains

Heads up, everyone! The third-floor kitchen will be closed for electrical maintenance on Friday 3 October from 08:00 to 11:00. You can use the kitchen on the second floor instead. Thanks for your cooperation!

Judge: Rewrites notice in warm, friendly plain English; retains all facts (date, times, floors, reason); 39 words (well under 80); avoids banned words; perfectly meets rubric.

Kimi K2.6

moonshotai/kimi-k2.6

10/10

Latency: 1.6s
Cost: $0.00538
Per 1,000: $5.38

118 in · 1317 out (1267 reasoning) · 34 words · checks 4/5

max_words
contains
contains
not_contains
not_contains

Hi team! Due to scheduled electrical maintenance, the third-floor kitchen will be closed on Friday 3 October from 08:00 to 11:00. Please use the second-floor kitchen instead during that time. Thanks for your cooperation!

Judge: Rewrites notice in warm, friendly plain English; retains all facts (date, times, floors, alternative); 39 words (well under 80); avoids banned words; perfectly meets rubric.

Kimi K2.5

moonshotai/kimi-k2.5

10/10

Latency: 1.0s
Cost: $0.00294
Per 1,000: $2.94

119 in · 1281 out (1229 reasoning) · 38 words · checks 5/5

max_words
contains
contains
not_contains
not_contains

Hi everyone! A quick heads-up: the third-floor kitchen will be closed for scheduled electrical maintenance on Friday 3 October from 08:00 to 11:00. Alternative facilities are available on the second floor during this time. Thanks for your cooperation!

Judge: Rewrite is warm and friendly, includes all facts (date, times, floors, reason), uses plain English, stays well under 80 words (47 words), avoids banned words, and is formatted as a chat message.

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, Kimi K2.7 Code at $0.25 per 1,000 runs. If you need the top score, Kimi K2.7 Code at $0.25 per 1,000 runs.

Same prompt, other families

Run it yourself

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

Side by side

Kimi K3

Kimi K2.7 Code

Kimi K2.6

Kimi K2.5

Frequently asked

Same prompt, other families

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