Run: 2026-02-20-01KHY8FM9WXRA0NZ5C9P940JTX

Run Details

Model:
Grok 4 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
8.9s
Cost:
$0.000474
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
88.94% 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
Fog blanketed the quiet town square. A scream shattered the midnight silence. She ran toward the old house. The door hung slightly ajar. Inside, shadows hid a gruesome scene. Blood pooled beneath the chandelier. Her husband lay stabbed on floor. Eyes wide in frozen terror. Who entered this locked mansion? Footprints vanished into the mist.
created_at"2026-02-20T19:30:01.67Z" 2/20/2026, 7:30:01 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency8085
moderation_latency(null)
generation_time8700
tokens_prompt46
tokens_completion97
native_tokens_prompt191
native_tokens_completion917
native_tokens_completion_images0
native_tokens_reasoning838
native_tokens_cached151
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"
usage0.00047405
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"909075a9-b3a5-5359-fd8f-650b73c5e7c1"
is_byokfalse
latency1247
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615801-k1u0ewu6BP1XrfvmJYFb"
upstream_id"909075a9-b3a5-5359-fd8f-650b73c5e7c1"
total_cost0.00047405
cache_discount0.00002265
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
88.94% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
06
16
26
35
46
55
66
75
85
95