Run: 2026-05-31-01KSYXM38SFWKF3NW1TN28WREA

Run Details

Model:
Claude Opus 4.8 (Reasoning, High)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
7.4s
Cost:
$0.005900
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 window. Detective Morgan entered the room. A body lay there cold. Blood pooled across the floor. The clock had stopped ticking. Someone had locked every door. Morgan studied the dead man. His eyes stared at nothing. A knife rested nearby silently. Three guests waited downstairs nervously. Each one hid a secret. The killer remained among them. Morgan smiled and started working. This case would prove interesting. Outside, the storm grew worse.
created_at"2026-05-31T11:45:02.759Z" 5/31/2026, 11:45:02 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5386
moderation_latency(null)
generation_time7376
tokens_prompt46
tokens_completion188
native_tokens_prompt60
native_tokens_completion224
native_tokens_completion_images(null)
native_tokens_reasoning46
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"
usage0.0059
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01VWxmFXer89Csq9qJKs2iES"
is_byokfalse
latency3674
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-1780227902-DGuOJIgBQCSxZ0Le0aZM"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227902-76QGQchjgkccpK5AfLfo"
upstream_id"msg_01VWxmFXer89Csq9qJKs2iES"
total_cost0.0059
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
sentences15
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145