Run: 2026-05-31-01KSYXES6CDX7P12ZSFN8P3ZJ4

Run Details

Duration:
6.3s
Cost:
$0.006425
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
97.67% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain fell on the mansion. The party had ended hours ago. Margaret found the study door. She pushed it open slowly. Lord Ashford sat completely still. His wine glass had shattered. Dark red stained the carpet. Margaret stepped closer, then froze. A knife protruded from him. She opened her mouth wide. No sound escaped her lips. Behind her, footsteps approached quietly. The grandfather clock struck midnight. Someone in this house lied. Everyone had wanted him dead. Now somebody had finally acted. Margaret turned toward the sound. A familiar face emerged slowly. "We need to talk," they whispered.
created_at"2026-05-31T11:42:08.6Z" 5/31/2026, 11:42:08 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3059
moderation_latency(null)
generation_time6232
tokens_prompt46
tokens_completion180
native_tokens_prompt60
native_tokens_completion245
native_tokens_completion_images(null)
native_tokens_reasoning30
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"
usage0.006425
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01Koq2QWSzVYoDNQoQmjtXun"
is_byokfalse
latency1823
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-1780227728-bMH4YJTt4uSFFOa7icPx"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227728-dvBfhAw9hEvlimM4Z98K"
upstream_id"msg_01Koq2QWSzVYoDNQoQmjtXun"
total_cost0.006425
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
97.67% Matches word count n/a
neededCleanfalse
sentences19
wordCounts
05
16
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
186