Run: 2026-04-24-01KQ0NCH7ADQQF0TSKVPXC074B

Run Details

Model:
GPT-5.5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.3s
Cost:
$0.003115
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
37.09% 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

AI
Rain combed the windows of Blackthorn Manor while Detective Mara Venn counted twelve dinner guests and one missing host. The grandfather clock struck midnight, and beneath its last shuddering chime, someone screamed from the locked winter garden. Mara reached the glass doors first, finding Lord Blackthorn dead among orchids, a silver letter opener in his throat. Behind her, every guest protested innocence, but each reflection in the rain-dark panes watched the corpse with recognition.
created_at"2026-04-24T21:12:29.68Z" 4/24/2026, 9:12:29 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency986
moderation_latency(null)
generation_time4268
tokens_prompt46
tokens_completion128
native_tokens_prompt41
native_tokens_completion97
native_tokens_completion_images0
native_tokens_reasoning0
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"
usage0.003115
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_088b35b3fdaab0c90169ebdcbdc1a0819689704e1a081c0e4f"
is_byokfalse
latency367
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-1777065149-qjFKi7PgDmHL8LBhe1Hc"
session_id(null)
api_type"completions"
id"gen-1777065149-FSISwg9XU0CX6f9iLnXB"
upstream_id"resp_088b35b3fdaab0c90169ebdcbdc1a0819689704e1a081c0e4f"
total_cost0.003115
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
37.09% Matches word count n/a
neededCleanfalse
sentences4
wordCounts
019
118
219
318