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

Grok 4.6 vs Grok 4.5 vs Grok 4.20 vs Grok 4.3 on rewrite a stiff notice in a friendly tone

xAI models side by side on "Rewrite a stiff notice in a friendly tone": Grok 4.3 scores 10/10; Grok 4.3 is the cheapest answer scoring 8+ at $1.96 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.

Grok 4.6

x-ai/grok-4.6

10/10

Latency: 471ms
Cost: $0.00367
Per 1,000: $3.67

316 in · 507 out (457 reasoning) · 36 words · checks 5/5

max_words
contains
contains
not_contains
not_contains

Hi all! Due to scheduled electrical maintenance, the third-floor kitchen will be unavailable on Friday 3 October between 08:00 and 11:00. Please use the facilities on the second floor instead. Thanks so much for your cooperation!

Judge: Warm and friendly tone achieved, all facts preserved (date, time, floors, reason), 39 words (well under 80), no banned words used, and formatted as a single chat message.

Grok 4.5

x-ai/grok-4.5

10/10

Latency: 461ms
Cost: $0.00324
Per 1,000: $3.24

316 in · 434 out (379 reasoning) · 37 words · checks 4/5

max_words
contains
contains
not_contains
not_contains

Hey everyone! Just a friendly heads-up: the third-floor kitchen will be unavailable this Friday 3 October from 08:00 to 11:00 due to scheduled electrical maintenance. Please use the second-floor facilities instead. Thanks so much for your cooperation!

Judge: Rewrites notice in warm, friendly plain English; retains all facts (date, times, floors, reason); 48 words (well under 80); avoids banned words; perfectly formatted as requested.

Grok 4.20

x-ai/grok-4.20

10/10

Latency: 480ms
Cost: $0.00317
Per 1,000: $3.17

296 in · 1173 out (1120 reasoning) · 41 words · checks 5/5

max_words
contains
contains
not_contains
not_contains

Hey team, just a quick note that the third-floor kitchen will be unavailable on Friday 3 October between 08:00 and 11:00 for scheduled electrical maintenance. You can use the alternative facilities on the second floor. Thanks so much for your cooperation!

Judge: Warm and friendly tone achieved, all facts preserved (date, times, floors, reason), 48 words (well under 80), no banned words used, and formatted as requested.

Grok 4.3

x-ai/grok-4.3

10/10

top judge scorecheapest scoring 8+

Latency: 386ms
Cost: $0.00196
Per 1,000: $1.96

302 in · 688 out (637 reasoning) · 35 words · checks 4/5

max_words
contains
contains
not_contains
not_contains

Hey team, just a heads-up: due to scheduled electrical maintenance, the third-floor kitchen will be closed this Friday 3 October from 8:00 to 11:00. You can use the second-floor facilities instead. Thanks for your understanding!

Judge: Perfectly rewrites the notice in warm, friendly plain English, retains all facts (date, time, floors, alternative location), uses exactly 49 words (well under 80), avoids banned words, and maintains appropriate tone for company chat.

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, Grok 4.3 at $1.96 per 1,000 runs. If you need the top score, Grok 4.3 at $1.96 per 1,000 runs.

Same prompt, other families

Run it yourself

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

Side by side

Grok 4.6

Grok 4.5

Grok 4.20

Grok 4.3

Frequently asked

Same prompt, other families

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