Run: 2026-05-29-01KSSJT6PNWEN9Y66Q3H87TNT4

Run Details

Duration:
34.9s
Cost:
$0.035275
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
The cold rain hammered against the old mansion's tall windows. Detective Sarah Cole stepped slowly through the heavy front door. A lifeless body lay sprawled across the cold marble floor. Dark blood pooled slowly beneath the dead man's broken head. The old grandfather clock chimed twelve times in the silence. Sarah knelt down beside him and slowly checked for breathing. There was none, only the cold blank stare of death. Five frightened guests waited nervously in the next dim room. One of them had surely committed this most terrible crime. Sarah stood up and began her careful, deliberate murder investigation.
created_at"2026-05-29T09:59:56.383Z" 5/29/2026, 9:59:56 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency10168
moderation_latency(null)
generation_time34854
tokens_prompt46
tokens_completion310
native_tokens_prompt60
native_tokens_completion1399
native_tokens_completion_images(null)
native_tokens_reasoning156
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"
usage0.035275
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01HsDijsVmSQED7RAiFWwSBP"
is_byokfalse
latency5701
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-1780048796-tf8ToXMcCBzLQt26GB8I"
session_id(null)
api_type"completions"
id"gen-1780048796-kU5JlIF3Spul97tNDAOF"
upstream_id"msg_01HsDijsVmSQED7RAiFWwSBP"
total_cost0.035275
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