Run: 2026-06-01-01KT1H7GMSS8V2RHJ36FYJ3WBF

Run Details

Duration:
36.8s
Cost:
$0.048000
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 old mansion's tall and narrow windows. Detective Sarah Cole stepped carefully across the cold marble floor. A single body lay sprawled beneath the grand crystal chandelier. Blood pooled darkly around the wealthy man's expensive silk tie. His cold eyes stared blankly at the high vaulted ceiling. Sarah knelt down slowly and examined the deep fatal wound. Someone here had wanted this rich old man completely dead. Outside, the thunder cracked loudly across the dark stormy sky. Five frightened guests waited nervously in the warm sitting room. One of them had surely committed this truly terrible crime.
created_at"2026-06-01T12:06:10.847Z" 6/1/2026, 12:06:10 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency35246
moderation_latency(null)
generation_time36795
tokens_prompt46
tokens_completion215
native_tokens_prompt60
native_tokens_completion1908
native_tokens_completion_images(null)
native_tokens_reasoning51
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"
usage0.048
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01EcqkmtL7YJQYdoyZPojchq"
is_byokfalse
latency1787
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-1780315570-atuj1PO8bHxNwse6PyDw"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780315570-DSuf4LxNbiN94Bs0XK5P"
upstream_id"msg_01EcqkmtL7YJQYdoyZPojchq"
total_cost0.048
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