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Run: 2026-07-25-01KYCRPABA3GF1AEWBXQ8YF3A8
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
18.6s
Cost:
$0.042725
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 greenhouse roof like impatient fingers demanding entry. Detective Inspector Maren Holt stepped carefully around the shattered glass. The body lay among the orchids, face turned politely away. Sir Edmund Vale had died holding a single white rose. Nobody in this house grew roses, Maren noted with interest. Four guests waited in the drawing room, drinking cold tea. Each one had lied already, though she couldn't prove it. The gardener claimed the doors were locked from within, always. Yet someone had walked out leaving footprints in wet soil. Maren crouched, measuring the print against her own small hand. Whoever killed him had feet smaller than a grown child's. Behind her, the greenhouse door clicked shut, then locked softly. Maren straightened slowly, keeping her breathing shallow and completely silent. Somewhere among the orchids, someone else was breathing too.
created_at
"2026-07-25T13:51:02.002Z"
7/25/2026, 1:51:02 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3619
moderation_latency
(null)
generation_time
18506
tokens_prompt
46
tokens_completion
391
native_tokens_prompt
60
native_tokens_completion
1697
native_tokens_completion_images
(null)
native_tokens_reasoning
168
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
0.042725
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNtFRqaWAXEwqDHE4qWh"
is_byok
false
latency
1424
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-1784987462-fuiGULtZRzDUOETuCqaU"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987462-QvISwUUpq64Vt1r8QpTS"
upstream_id
"msg_011CdNtFRqaWAXEwqDHE4qWh"
total_cost
0.042725
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
10
7
10
8
10
9
10
10
10
11
10
12
10
13
9