Run: 2026-04-24-01KQ0PW34JEXJA1V2HK243BJ8F

Run Details

Model:
GPT-5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
11.7s
Cost:
$0.013345
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain silvered Blackthorn Manor's windows. Inside, grandfather clocks stopped together. Detective Mara Vale arrived alone. The butler opened without blinking. Madam lies upstairs, he whispered. Her pearls circled spilled wine. A letter burned beside her. Only one sentence remained legible. Trust nobody after midnight, Eleanor. Thunder answered from the conservatory. Someone there laughed very softly. Mara found fresh blood underneath. The night had just confessed.
created_at"2026-04-24T21:38:28.127Z" 4/24/2026, 9:38:28 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency11270
moderation_latency(null)
generation_time11565
tokens_prompt46
tokens_completion441
native_tokens_prompt41
native_tokens_completion438
native_tokens_completion_images0
native_tokens_reasoning329
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.013345
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_079f04694044e6bf0169ebe2d450e48194863cb9281c666490"
is_byokfalse
latency674
model_permaslug"openai/gpt-5.5-20260423"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777066708-MeGoqfx635VkD0trZEl4"
session_id(null)
api_type"completions"
id"gen-1777066708-HwT4WximxvQRvMhm4pCb"
upstream_id"resp_079f04694044e6bf0169ebe2d450e48194863cb9281c666490"
total_cost0.013345
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences13
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125