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Run: 2026-04-24-01KQ0NKY3D1BNVT5R3HNSWP61N
Run Details
Model:
GPT-5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
14.2s
Cost:
$0.028975
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
At midnight, the bells of Blackthorn Hall shivered through rain, waking Clara Vale beside her dying fire and cold ashes. She smelled candle smoke before she heard the scream, thin as wire, rising from the locked library below in darkness. By the time she reached the stairs, every portrait seemed to watch her with varnished, accusing eyes from the walls. Lord Ashcombe lay across the Persian rug, one hand clenched around a silver chess queen, his blood black beneath him. The windows were bolted, the key remained inside, and no muddy footprint disturbed the polished floor near his silent body. Only the grandfather clock had stopped, its hands fixed at twelve minutes past a quarter past one that wet morning. Clara knelt, noticing a scrap of blue silk tucked beneath the dead man's collar like a small secret flag there. Behind her, someone whispered that murder had finally come home, and the candles guttered in agreement throughout the watching house.
created_at
"2026-04-24T21:16:32.245Z"
4/24/2026, 9:16:32 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
12612
moderation_latency
(null)
generation_time
14037
tokens_prompt
46
tokens_completion
555
native_tokens_prompt
41
native_tokens_completion
959
native_tokens_completion_images
0
native_tokens_reasoning
762
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.028975
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0e25fda346f3761d0169ebddb05ce48194968b33bfcc9b783e"
is_byok
false
latency
329
model_permaslug
"openai/gpt-5.5-20260423"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer
(null)
request_id
"req-1777065392-w4k8DoyfJJEVTEoEYm6z"
session_id
(null)
api_type
"completions"
id
"gen-1777065392-UnR4x62z8eMFQUslgBnL"
upstream_id
"resp_0e25fda346f3761d0169ebddb05ce48194968b33bfcc9b783e"
total_cost
0.028975
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20