Run: 2026-04-24-01KQ0MXEMW5Q1C1J4FAJ919TDB

Run Details

Model:
GPT-5.5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
4.4s
Cost:
$0.003505
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
83.80% 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 Blackmoor Manor’s cracked windows tonight. Detective Mara Vale arrived late, carrying roses and suspicion. Inside, the grandfather clock bled twelve notes into silence. Lord Ashcroft lay facedown beside the unlit marble hearth, cold. Around him, guests whispered alibis behind masks of grief. A toppled chessboard scattered kings, pawns, and crimson fingerprints nearby. Mara noticed one white bishop clenched in Ashcroft’s hand. Then the lights failed, and someone softly laughed upstairs.
created_at"2026-04-24T21:04:15.527Z" 4/24/2026, 9:04:15 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1073
moderation_latency(null)
generation_time4244
tokens_prompt46
tokens_completion139
native_tokens_prompt41
native_tokens_completion110
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"
usage0.003505
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0aa8f64f651994100169ebdacfa4948196bb360624172fb94b"
is_byokfalse
latency327
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-1777064655-VeUhYvdq0NbLC8XuoR9X"
session_id(null)
api_type"completions"
id"gen-1777064655-ZDxLQ1Dp8M4yaYKE3p01"
upstream_id"resp_0aa8f64f651994100169ebdacfa4948196bb360624172fb94b"
total_cost0.003505
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
83.80% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
010
19
29
310
49
510
69
79