Run: 2026-05-31-01KSYXDXGD9572X3FGPFYKCJNK

Run Details

Duration:
27.8s
Cost:
$0.075575
Provider:
Anthropic

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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The cold rain hammered against the old manor windows as Detective Sarah Cole stepped reluctantly across the creaking wooden threshold. Inside the dim foyer, a single bright chandelier flickered above the body sprawled awkwardly across the polished marble entrance floor. The murdered victim, wealthy industrialist Charles Whitmore, lay perfectly motionless with a jeweled dagger buried deep within his broad chest. Five anxious dinner guests huddled together near the grand staircase, each one now suddenly a suspect in this terrible crime. Detective Cole carefully surveyed their pale and frightened faces, knowing the killer stood quietly somewhere within this very tense room.
created_at"2026-05-31T11:41:40.253Z" 5/31/2026, 11:41:40 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4033
moderation_latency(null)
generation_time27721
tokens_prompt46
tokens_completion339
native_tokens_prompt60
native_tokens_completion3011
native_tokens_completion_images(null)
native_tokens_reasoning169
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"end_turn"
service_tier"default"
usage0.075575
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01UJPL8LuGFyjCuU6uTkKq9e"
is_byokfalse
latency995
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780227700-uYMAh2KOEb5o0OcDxgDB"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227700-11AyRG6jNp1N6BDszUa6"
upstream_id"msg_01UJPL8LuGFyjCuU6uTkKq9e"
total_cost0.075575
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
020
120
220
320
420