Run: 2026-04-24-01KQ0MZ689T2X5AT4XN7CBQNRP

Run Details

Model:
GPT-5.5
Duration:
4.6s
Cost:
$0.003595
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

AI
Rain stitched silver threads across Blackwell Manor’s cracked windowpanes tonight. Detective Mara Vale arrived before the thunder swallowed midnight completely. Inside, candles trembled beside portraits whose eyes seemed accusingly alive. Lord Blackwell lay sprawled beneath the chandelier, smiling strangely still. A ruby-handled letter opener bloomed from his spotless evening waistcoat. The guests gathered silently, each hiding hands behind velvet shadows. Mara noticed muddy footprints ending abruptly at the locked library. Somewhere upstairs, a music box began playing its funeral waltz.
created_at"2026-04-24T21:05:12.465Z" 4/24/2026, 9:05:12 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1201
moderation_latency(null)
generation_time4478
tokens_prompt46
tokens_completion155
native_tokens_prompt41
native_tokens_completion113
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"
usage0.003595
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_020df3801785e0350169ebdb088a248195ab124b40dd5c5045"
is_byokfalse
latency273
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-1777064712-AoUtBru93LZLHaJLbc1t"
session_id(null)
api_type"completions"
id"gen-1777064712-WNyjR0sbe7TlUOLdgYQt"
upstream_id"resp_020df3801785e0350169ebdb088a248195ab124b40dd5c5045"
total_cost0.003595
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
sentences8
wordCounts
010
110
210
310
410
510
610
710