NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-04-24-01KQ0N1TFFFWGSWQ9TVHBX7Z8G
Run Details
Model:
GPT-5.5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
5.2s
Cost:
$0.004105
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
89.63%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain needled the windows as Inspector Vale entered Ashbourne Hall. Twelve guests watched silently, their champagne forgotten beside cooling plates. At midnight, the grandfather clock began striking without its pendulum. Then Lady Marwick screamed from behind the locked library door. Vale forced it open, revealing Sir Julian facedown, bloodless, smiling. In his hand lay a violet ribbon, freshly torn. Every guest denied knowing why the ribbon smelled of smoke. Outside, muddy footprints circled the house, then simply vanished. Above the mantel, a portrait had been slashed open. Inside its canvas, Vale found one word: forgive me.
created_at
"2026-04-24T21:06:38.709Z"
4/24/2026, 9:06:38 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1207
moderation_latency
(null)
generation_time
4643
tokens_prompt
46
tokens_completion
165
native_tokens_prompt
41
native_tokens_completion
130
native_tokens_completion_images
0
native_tokens_reasoning
0
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
0.004105
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_070745fe2760d43e0169ebdb5ecf1c8197af61c8d718749ef4"
is_byok
false
latency
303
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-1777064798-UEzyNWslFvS71KNNFqb5"
session_id
(null)
api_type
"completions"
id
"gen-1777064798-4VDrcIBc0CnziYy7fOk7"
upstream_id
"resp_070745fe2760d43e0169ebdb5ecf1c8197af61c8d718749ef4"
total_cost
0.004105
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
89.63%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
10
1
10
2
10
3
10
4
10
5
9
6
10
7
9
8
9
9
9