Run: 2026-05-29-01KSSJS9KCXKK0SGPJDARTXSHR

Run Details

Duration:
6.7s
Cost:
$0.007375
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 windows. Detective Mara Cole stepped inside. The mansion smelled of death. A body lay near stairs. Blood pooled across marble tiles. Nobody had touched the victim. The guests waited in silence. Mara studied each frightened face. Someone here was the killer. Lightning flashed across the room. She removed her leather gloves. The clock struck midnight slowly. Every alibi sounded too perfect. The dead man clutched something. Mara knelt to look closer. A torn photograph remained hidden. She recognized one familiar face. This case felt strangely personal. The storm refused to stop. Her investigation began right now.
created_at"2026-05-29T09:59:26.583Z" 5/29/2026, 9:59:26 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3670
moderation_latency(null)
generation_time6607
tokens_prompt46
tokens_completion199
native_tokens_prompt60
native_tokens_completion283
native_tokens_completion_images(null)
native_tokens_reasoning39
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"
usage0.007375
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_015Lj2KZaBDtJuLjqg64cd9N"
is_byokfalse
latency1924
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-1780048766-OeHfWOQ3YWsx1xG5ytqu"
session_id(null)
api_type"completions"
id"gen-1780048766-FFJLZ1DLrdp7WWmAVT95"
upstream_id"msg_015Lj2KZaBDtJuLjqg64cd9N"
total_cost0.007375
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
sentences20
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195