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Run: 2026-07-25-01KYCPMGC7TJE1YHC6GD21BAXY
Run Details
Model:
Claude Opus 5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
6.5s
Cost:
$0.006900
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
88.22%
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
The rain had not stopped falling since Tuesday last week. Inspector Marlowe Vance stepped over the threshold and removed her hat. Blood pooled beneath the grand piano in slow, widening circles. Lord Ashcombe lay face down across the ivory keys, motionless. Seven guests waited in the drawing room, none of them speaking. The butler had discovered the body at precisely half past ten. Nobody had heard a gunshot, though everybody claimed perfect hearing. Vance knelt and studied the dead man's oddly clean right hand. A single black glove rested on the windowsill, damp and abandoned. Outside, the gravel drive held no tire tracks or footprints. "Whoever killed him," Vance murmured quietly, "never left this house."
created_at
"2026-07-25T13:15:05.486Z"
7/25/2026, 1:15:05 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1721
moderation_latency
(null)
generation_time
6397
tokens_prompt
46
tokens_completion
187
native_tokens_prompt
60
native_tokens_completion
264
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"
service_tier
"default"
usage
0.0069
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNqWTwQ1q4eFwNqaH3Kq"
is_byok
false
latency
1721
model_permaslug
"anthropic/claude-opus-5-20260723"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer
(null)
request_id
"req-1784985305-fjCG7bxI40AO5S7Yibjn"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784985305-6yeZpHBvZZA4wfCNh324"
upstream_id
"msg_011CdNqWTwQ1q4eFwNqaH3Kq"
total_cost
0.0069
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
response_cache_source_id
(null)
data_region
"global"
Evaluation details
Result
Evaluator
Details
Meta Data
88.22%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
10
1
11
2
10
3
10
4
11
5
11
6
10
7
11
8
11
9
10
10
10