Run: 2026-06-01-01KT1GSYJ8PBXEN6995CYWVAE7

Run Details

Duration:
26.4s
Cost:
$0.069700
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 morning fog rolled slowly across the quiet harbor town, wrapping the cobblestone streets in a thick, suffocating gray blanket. Detective Sarah Mills parked her old car near the lighthouse, where someone reported a dead body lying on the rocks. She stepped out very carefully, pulling her coat tighter against the biting cold wind that swept off the churning sea. The victim was a young man, perhaps thirty, dressed in an expensive gray suit now soaked with dark crimson blood. Sarah knelt down beside him, noticing the strange silver ring still clutched tightly within his pale, cold, lifeless left hand. No identification appeared anywhere on his person, only that mysterious ring engraved with a single chilling word reading simply: remember.
created_at"2026-06-01T11:58:46.348Z" 6/1/2026, 11:58:46 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3642
moderation_latency140
generation_time26269
tokens_prompt46
tokens_completion467
native_tokens_prompt60
native_tokens_completion2776
native_tokens_completion_images(null)
native_tokens_reasoning271
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"
usage0.0697
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01TFv9yKvBBWq5gNpecgss7Z"
is_byokfalse
latency1120
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-1780315126-38hmfy2jwuSNX2JMygKR"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780315126-Mtv8g9xHRTVAc4BZ9ycd"
upstream_id"msg_01TFv9yKvBBWq5gNpecgss7Z"
total_cost0.0697
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
sentences6
wordCounts
020
120
220
320
420
520