Run: 2026-06-01-01KT1HFTG28ADBV8Z9NKAM26AV

Run Details

Duration:
38.2s
Cost:
$0.033425
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 Mills stepped carefully across the polished marble floor. The pale body lay sprawled beneath the grand mahogany staircase. Crimson stained the carpet where the man had finally fallen. His cold eyes stared blankly toward the flickering chandelier above. Sarah knelt beside him and studied the deep fatal wound. Someone inside this house had murdered wealthy Edmund Blackwood tonight. Five guests remained trapped here by the relentless midnight storm. Each one harbored dark secrets worth killing to keep hidden. Sarah rose slowly and turned to face the assembled suspects.
created_at"2026-06-01T12:10:43.086Z" 6/1/2026, 12:10:43 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3631
moderation_latency(null)
generation_time38139
tokens_prompt46
tokens_completion301
native_tokens_prompt60
native_tokens_completion1325
native_tokens_completion_images(null)
native_tokens_reasoning138
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"
usage0.033425
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_017fEgjfmFLq7sQ3NRJ7ejfY"
is_byokfalse
latency1070
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-1780315843-3JolQ7FE2iIvzrFOg0oW"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780315843-dcRqwHI7BIOjoxlMteaA"
upstream_id"msg_017fEgjfmFLq7sQ3NRJ7ejfY"
total_cost0.033425
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