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Run: 2026-07-25-01KYCQY648612A5GTJP3JSW7RY
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
16.9s
Cost:
$0.037250
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
The rain had stopped, but the gutters still whispered secrets. Inspector Hale arrived at dawn wearing yesterday's rumpled gray coat. The body lay beneath the pier, face turned toward shore. A woman in a red scarf watched from the railing. She had called the station herself, twenty-three minutes past four. Hale noticed her shoes were dry despite the soaked planks. Sergeant Doyle crouched, lifting the victim's hand with gloved fingers. Three rings, no watch, and a wedding band turned inward. Somebody dressed him carefully before pushing him into the water. The woman spoke first, asking whether they wanted her statement. Hale said nothing, letting the silence stretch between them thin. Gulls circled overhead, patient as lawyers waiting for a verdict. Somewhere behind the warehouses, a church bell counted to seven. She smiled then, and Hale understood the morning had begun.
created_at
"2026-07-25T13:37:51.248Z"
7/25/2026, 1:37:51 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3842
moderation_latency
(null)
generation_time
16783
tokens_prompt
46
tokens_completion
352
native_tokens_prompt
60
native_tokens_completion
1478
native_tokens_completion_images
(null)
native_tokens_reasoning
131
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
0.03725
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsF8jK4gHXqGYxW3hfx"
is_byok
false
latency
1217
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-1784986671-P3QOXglDUlqi0ZENgDYR"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986671-9uWLesd3HnA1USuNjIAH"
upstream_id
"msg_011CdNsF8jK4gHXqGYxW3hfx"
total_cost
0.03725
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