Run: 2026-06-01-01KT1HY6ZA3R0ZG0FQD8X3XABF

Run Details

Duration:
17.1s
Cost:
$0.046900
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 rain hammered against the old mansion windows as Detective Sarah Cole stepped carefully across the cold muddy front lawn. Inside, the body of the wealthy patriarch Edward Hartwell lay sprawled beneath the grand staircase, dark blood pooling around him. Five anxious relatives huddled together inside the parlor, their faces pale, each one secretly hoping nobody suspected their own guilt. Sarah knelt beside the cold corpse, noting the strange silver letter opener buried deep within the old man's broken chest. Outside, the thunder rolled menacingly across the darkened sky while the killer watched silently from the shadows near the doorway.
created_at"2026-06-01T12:18:34.607Z" 6/1/2026, 12:18:34 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3561
moderation_latency(null)
generation_time17056
tokens_prompt46
tokens_completion306
native_tokens_prompt60
native_tokens_completion1864
native_tokens_completion_images(null)
native_tokens_reasoning137
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"
usage0.0469
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_012s8XjbnCxhd6WGsWKpFPpR"
is_byokfalse
latency913
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-1780316314-ltqG6b2RsgkO5o8c1MHi"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780316314-Ss6o1C900BOQa4yC590m"
upstream_id"msg_012s8XjbnCxhd6WGsWKpFPpR"
total_cost0.0469
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