Run: 2026-05-31-01KSYXE77R427Q1Q6S20XZ1874

Run Details

Duration:
9.8s
Cost:
$0.009800
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
99.26% 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. Detective Mara Cole stepped inside. The body lay face-down. Blood pooled beneath the chandelier. Nobody spoke a single word. Five guests watched her carefully. Each face hid dark secrets. The clock struck midnight slowly. Someone here was the killer. Mara studied every nervous gesture. The victim was Charles Ashford. He owned this entire estate. His wife clutched her pearls. The butler trembled near windows. Lightning flashed across pale faces. Mara noticed the broken glass. A knife lay strangely clean. Wine stained the white carpet. Footprints led toward the library. The fire crackled too loudly. Someone moved behind thick curtains. Mara turned around very quickly. Her hand reached her holster. The lights flickered then died. Darkness swallowed the entire room. A scream pierced the silence. Mara fumbled for her flashlight. The beam revealed another body. Now two people were dead. The hunt had truly begun.
created_at"2026-05-31T11:41:50.214Z" 5/31/2026, 11:41:50 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4842
moderation_latency(null)
generation_time9754
tokens_prompt46
tokens_completion288
native_tokens_prompt60
native_tokens_completion380
native_tokens_completion_images(null)
native_tokens_reasoning50
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"
usage0.0098
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_0137CWkJ2HJwkM1bfEDEXHmd"
is_byokfalse
latency3202
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-1780227710-A2uWWJg7BBI0NtEXwo83"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227710-PuLSU0g4KTpFFB20MmnW"
upstream_id"msg_0137CWkJ2HJwkM1bfEDEXHmd"
total_cost0.0098
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
99.26% Matches word count n/a
neededCleanfalse
sentences30
wordCounts
05
15
24
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195
205
215
225
235
245
255
265
275
285
295