Run: 2026-04-24-01KQ0PC0A5M0T5F3NMFP50B7PW

Run Details

Model:
GPT-5.5
Duration:
4.5s
Cost:
$0.003835
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
59.10% 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 polished the manor windows while Inspector Vale arrived, counting thirteen candles and one chair turned toward the locked study. Inside, Lord Aster lay beneath scattered chessmen, his silver cufflink missing, and the grandfather clock stopped at midnight precisely. No one admitted hearing screams, though the guests stood pale and silent, each clutching secrets like knives under velvet. Vale noticed wet footprints crossing the Persian rug, beginning at the corpse and ending before a bookcase without handles. Then the widow laughed softly upstairs, and every candle in the hall extinguished at once, except the thirteenth.
created_at"2026-04-24T21:29:40.994Z" 4/24/2026, 9:29:40 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency665
moderation_latency(null)
generation_time4409
tokens_prompt46
tokens_completion161
native_tokens_prompt41
native_tokens_completion121
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"
usage0.003835
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_000486e759e7ed1b0169ebe0c513b881969b13d2f10ed203f8"
is_byokfalse
latency420
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-1777066180-09Z91bFGvMkMKGmo5aFY"
session_id(null)
api_type"completions"
id"gen-1777066180-xl5BFzXvONhy5SQ4BSxp"
upstream_id"resp_000486e759e7ed1b0169ebe0c513b881969b13d2f10ed203f8"
total_cost0.003835
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
59.10% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
020
119
219
319
418