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Run: 2026-07-25-01KYCPW1EJPXX7D0RHMB7WH6HN
Run Details
Model:
Claude Opus 5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
8.5s
Cost:
$0.007850
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
96.30%
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 Ashgrove Manor all that night. Detective Inspector Vera Coombes arrived just before the dawn. The front door hung open, swinging on one broken hinge. Inside, a grandfather clock had stopped precisely at eleven-thirteen. Lord Ashgrove lay face down across the library's Persian rug. A silver letter opener protruded from between his shoulder blades. Someone had arranged six white roses beside the dead man. The butler stood weeping quietly in the doorway behind her. Nine guests waited upstairs, none of them wearing dry shoes. Vera knelt and studied the wound with practiced, patient care. Whoever struck the blow had known exactly where to aim. She noticed the wine glass, wiped clean of every fingerprint. Outside, thunder rolled across the moors like distant, hungry applause. This killer had planned tonight for a very long time.
created_at
"2026-07-25T13:19:12.345Z"
7/25/2026, 1:19:12 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2123
moderation_latency
(null)
generation_time
8405
tokens_prompt
46
tokens_completion
216
native_tokens_prompt
60
native_tokens_completion
302
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
0.00785
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNqpfEYms1bsjvNiE9dg"
is_byok
false
latency
2123
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-1784985552-0oU1qbFVzqgHDgI7nNqi"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784985552-2kB3UhcbPyRpPfdbqIZw"
upstream_id
"msg_011CdNqpfEYms1bsjvNiE9dg"
total_cost
0.00785
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
96.30%
Matches word count
n/a
neededClean
false
sentences
14
wordCounts
0
10
1
9
2
10
3
9
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10