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Run: 2026-07-25-01KYCR2VK4RD02472PY0P2XKMS
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
18.1s
Cost:
$0.042525
Provider:
Amazon Bedrock
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 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 Hall all that night. Margaret Ellis found the body at precisely six that morning. She had come upstairs to light the fires as usual. The heavy library door stood open, which was never allowed. Inside, Sir Edmund Wrayburn lay sprawled across the writing desk. His silver fountain pen had rolled beneath the tall bookcase. A brass letter opener protruded from between his shoulder blades. Two whisky glasses stood upon the side table, both empty. Margaret did not scream, though she wanted to very badly. Instead she noticed the mantel clock had stopped at midnight. Someone had wound it wrong, or else stopped it deliberately. Eight guests slept upstairs, and one of them had lied. Margaret backed out slowly and went downstairs to fetch help. The rain kept falling, washing every footprint from the gravel.
created_at
"2026-07-25T13:40:24.299Z"
7/25/2026, 1:40:24 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3936
moderation_latency
(null)
generation_time
18027
tokens_prompt
46
tokens_completion
377
native_tokens_prompt
60
native_tokens_completion
1689
native_tokens_completion_images
(null)
native_tokens_reasoning
165
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
0.042525
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsSR4PERfX7P4R92EDU"
is_byok
false
latency
1284
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-1784986824-Y1HGlL4vx5mxn5AvrWRs"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986824-BkTmx7JT0DZQXIffQGFu"
upstream_id
"msg_011CdNsSR4PERfX7P4R92EDU"
total_cost
0.042525
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
100.00%
Matches word count
n/a
neededClean
false
sentences
14
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10