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Run: 2026-04-24-01KPZV5219NFWQWAWHBP592M8M
Run Details
Model:
Claude Opus 4.7
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
6.2s
Cost:
$0.009075
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
98.27%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain hammered the cobblestones outside the old Blackwood Manor gates. Detective Harlan Vance stepped carefully across the slick stone path. A single light burned in the third-floor library window. The butler waited silently beneath the dripping wrought iron archway. His face betrayed nothing beyond a practiced, professional cold composure. "She is upstairs, sir," he murmured through pale, trembling lips. Vance nodded once and followed him into the shadowed foyer. Portraits of dead ancestors watched them climb the creaking staircase. Somewhere deep below, a grandfather clock struck midnight with authority. The library door stood ajar, spilling amber light into darkness. Lady Blackwood lay sprawled across her husband's enormous mahogany desk. A silver letter opener protruded from her embroidered silk blouse. Blood had pooled beneath three scattered pages of torn correspondence. Vance crouched low and studied the victim's wide, frozen eyes. "Nobody leaves this house tonight," he said without turning around.
created_at
"2026-04-24T13:34:01.782Z"
4/24/2026, 1:34:01 PM
model
"anthropic/claude-4.7-opus-20260416"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1058
moderation_latency
211
generation_time
5924
tokens_prompt
46
tokens_completion
255
native_tokens_prompt
65
native_tokens_completion
350
native_tokens_completion_images
(null)
native_tokens_reasoning
0
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"end_turn"
usage
0.009075
router
(null)
provider_responses
0
endpoint_id
"0fa65117-00d9-4835-808d-9b68041d9ce4"
id
"416ab849-eb7f-4d38-ac9e-523154beb268"
is_byok
false
latency
1056
model_permaslug
"anthropic/claude-4.7-opus-20260416"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer
(null)
request_id
"req-1777037641-TIGvF0x6jxudLZN9PO1H"
session_id
(null)
api_type
"completions"
id
"gen-1777037641-Gpb0kjWqfJJaKsSJIrGj"
upstream_id
"416ab849-eb7f-4d38-ac9e-523154beb268"
total_cost
0.009075
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
98.27%
Matches word count
n/a
neededClean
false
sentences
15
wordCounts
0
10
1
10
2
9
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10