Run: 2026-05-31-01KSYXFS7JKM4WK4SBEC93QMCG

Run Details

Duration:
15.8s
Cost:
$0.037225
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered against the windows of the old Blackwood estate. Detective Sarah Cole stepped carefully across the cold wet stones. Inside, the lifeless body lay sprawled near the marble staircase. Blood pooled darkly beneath the dead man's expensive silk shirt. His glassy eyes stared blankly toward the flickering chandelier above. Sarah knelt down slowly and examined the deep fatal wound. A single gunshot had clearly ended this wealthy man's life. Footsteps echoed somewhere deep within the vast, silent old mansion. Sarah rose quickly and reached for her loaded service weapon. Someone else still remained inside, hiding among the shadows tonight.
created_at"2026-05-31T11:42:41.407Z" 5/31/2026, 11:42:41 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3108
moderation_latency(null)
generation_time15054
tokens_prompt46
tokens_completion304
native_tokens_prompt60
native_tokens_completion1477
native_tokens_completion_images(null)
native_tokens_reasoning134
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"
usage0.037225
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01Lq5LFxp1DD7iSzzuLx5WwS"
is_byokfalse
latency976
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-1780227762-ONJ2bPOPC174vyluKTuQ"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227762-LrOENmdz1h3sfSgMQLqR"
upstream_id"msg_01Lq5LFxp1DD7iSzzuLx5WwS"
total_cost0.037225
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
sentences10
wordCounts
010
110
210
310
410
510
610
710
810
910