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Run: 2026-07-25-01KYCPN2FQ1A4J3T3AG625ANGE
Run Details
Model:
Claude Opus 5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
8.9s
Cost:
$0.008925
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
98.15%
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 windows of Blackthorn House like impatient fists. Inside, the grandfather clock struck three with unusual, hollow reluctance. Detective Inspector Marlowe removed her coat and studied the room. Eleven guests sat frozen around a table set for twelve. The empty chair belonged to Sir Edmund Blackthorn, now deceased. His body lay upstairs, discovered barely forty minutes before midnight. Nobody had left the house since the storm began at dusk. Marlowe counted the faces, memorizing each nervous tic and glance. "Somebody here killed him," she said, quietly folding her gloves. The fire spat once, then settled into a guilty silence. Mrs. Hensley, the housekeeper, dropped a teacup onto the floor. Its shatter sounded impossibly loud against the drumming of rain. Marlowe smiled without warmth and pulled out the twelfth chair. "Let us begin," she murmured, "with where everyone was standing."
created_at
"2026-07-25T13:15:24.031Z"
7/25/2026, 1:15:24 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1713
moderation_latency
(null)
generation_time
8234
tokens_prompt
46
tokens_completion
237
native_tokens_prompt
60
native_tokens_completion
345
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
0.008925
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNqXsDtrYTer9Lqtzt1Z"
is_byok
false
latency
1713
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-1784985324-06nS18CTmnu5veZake9x"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784985324-CvgDfXy8NUOnXDc45I2V"
upstream_id
"msg_011CdNqXsDtrYTer9Lqtzt1Z"
total_cost
0.008925
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
98.15%
Matches word count
n/a
neededClean
false
sentences
14
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
11
7
10
8
10
9
10
10
10
11
10
12
10
13
10