Run: 2026-05-29-01KSSJM20N6P5PQ44X5J1V32SJ

Run Details

Model:
Claude Opus 4.8 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
5.7s
Cost:
$0.006725
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the old mansion. The clock struck past midnight. Detective Hayes arrived too late. A body lay on marble. Blood pooled beneath the chandelier. Everyone gathered in the parlor. Each face hid dark secrets. Someone here had killed tonight. The butler trembled near windows. A maid clutched her apron. Lightning flashed across pale faces. The victim was Lord Pembroke. His wine glass sat shattered. Hayes studied every nervous guest. One person knew the truth. Their lies would soon unravel. The game had truly begun.
created_at"2026-05-29T09:56:34.975Z" 5/29/2026, 9:56:34 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2814
moderation_latency(null)
generation_time5681
tokens_prompt46
tokens_completion192
native_tokens_prompt60
native_tokens_completion257
native_tokens_completion_images(null)
native_tokens_reasoning32
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"
usage0.006725
router(null)
provider_responses
0
endpoint_id"dfc0e5bd-d703-4fe2-a7bb-655eb95d5441"
id"msg_01AhvBuuVmC7jJTPYLDC9KWh"
is_byokfalse
latency1599
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-1780048594-i1S4QXL2zr0Jta29LKI2"
session_id(null)
api_type"completions"
id"gen-1780048594-LjMlmneLkY1iikocfdkh"
upstream_id"msg_01AhvBuuVmC7jJTPYLDC9KWh"
total_cost0.006725
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
sentences17
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165