Run: 2026-02-20-01KHY7VMN20YHAYYNS2WK390Z5

Run Details

Model:
Grok 4.1 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
6.1s
Cost:
$0.000309
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
77.88% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Mist hung low over Blackwood Manor. Guests dined in the grand hall. A crash echoed from the study. Lord Blackwood slumped over his desk. Poison frothed from his open lips. Butler discovered the body moments later. Panic gripped the assembled dinner guests. Inspector Graves arrived amid thunderous rain.
created_at"2026-02-20T19:19:06.667Z" 2/20/2026, 7:19:06 PM
model"x-ai/grok-4.1-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency407
moderation_latency(null)
generation_time5975
tokens_prompt46
tokens_completion284
native_tokens_prompt191
native_tokens_completion598
native_tokens_completion_images0
native_tokens_reasoning537
native_tokens_cached190
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.0003087
router(null)
provider_responses
0
endpoint_id"9821aa0e-dce3-4c27-9716-161359123d0b"
id"772e12ff-3d04-0473-ceee-ab17d5048d8a"
is_byokfalse
latency182
model_permaslug"x-ai/grok-4.1-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615146-somoc0DDxM9bTolBuOLP"
upstream_id"772e12ff-3d04-0473-ceee-ab17d5048d8a"
total_cost0.0003087
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
77.88% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
06
16
26
36
46
56
66
76