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Run: 2026-07-25-01KYCR9J2V57D80F5K9WP1BNVT
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
16.6s
Cost:
$0.035525
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 had washed the greenhouse glass clean by half six. Margaret Vane found the body among her prizewinning white orchids. He lay face down, one hand curled around a trowel. The other hand held nothing, though the fingers stayed open. Margaret did not scream, because screaming had never helped anyone. She noted the time, the smell, the mud, the silence. Her nephew Colin had promised to arrive before eight o'clock. This man was not Colin, and that was somehow worse. She crouched, knees complaining, and turned the cold, heavy face. The gardener's eyes looked back at her, mildly surprised still. Behind her, somewhere in the house, a telephone began ringing. It rang eleven times while she decided what to say. Then it stopped, and the greenhouse was very quiet again. Margaret rose, brushed her skirt, and locked the glass door. Whoever telephoned would call again; killers are rarely that patient.
created_at
"2026-07-25T13:44:03.942Z"
7/25/2026, 1:44:03 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4654
moderation_latency
204
generation_time
16149
tokens_prompt
46
tokens_completion
461
native_tokens_prompt
60
native_tokens_completion
1409
native_tokens_completion_images
(null)
native_tokens_reasoning
235
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
0.035525
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsieSF9s2r7V7hNUwLL"
is_byok
false
latency
1404
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-1784987044-G9fwx1lr3NI675UBHBzK"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987044-cwu0yAKx3Ds3GLf3bRat"
upstream_id
"msg_011CdNsieSF9s2r7V7hNUwLL"
total_cost
0.035525
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
15
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
14
10