NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-04-24-01KQ0NXEV7QJD8D4NV0TPQQYVN
Run Details
Model:
GPT-5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
11.4s
Cost:
$0.017155
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain stitched silver threads across Blackwell Manor's windows that midnight. Inspector Vale arrived late, summoned by bells nobody admitted ringing. Inside, the chandelier trembled above portraits with accusing glass eyes. Lady Blackwell lay beneath it, pearls scattered like frozen tears. Her right hand clutched a letter sealed with crimson wax. No blood marked her gown, only one darkening violet bruise. Around the body, five heirs practiced grief with perfect manners. The clock had stopped at twelve, though thunder continued counting. Vale noticed muddy footprints ending abruptly beside the locked library. Then the corpse's eyes opened, reflecting someone standing behind him.
created_at
"2026-04-24T21:21:44.369Z"
4/24/2026, 9:21:44 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
10810
moderation_latency
(null)
generation_time
11167
tokens_prompt
46
tokens_completion
518
native_tokens_prompt
41
native_tokens_completion
565
native_tokens_completion_images
0
native_tokens_reasoning
433
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
0.017155
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0e37d1b16a6635940169ebdee889dc81949bc32d195fa3a0e0"
is_byok
false
latency
469
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-1777065704-JWlrgBcltANoSnJ8Kf3m"
session_id
(null)
api_type
"completions"
id
"gen-1777065704-rIP6cnWDDqSg453Blb5T"
upstream_id
"resp_0e37d1b16a6635940169ebdee889dc81949bc32d195fa3a0e0"
total_cost
0.017155
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
10
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10