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Run: 2026-10-09-01M4G0Y6KKWPV73QN52EN4K1BH
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.8s
Cost:
$0.000625
Provider:
Claude Platform on AWS
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The rain had fallen over Ashford Manor since dawn, washing gravel paths grey and filling every gutter with cold water. Inside the drawing room, Lord Edmund Vale lay motionless beside the cold fireplace, one hand still clutching a crystal tumbler. Detective Inspector Margaret Holloway stood in the doorway, her umbrella dripping onto the rug, and studied the scene very carefully. Nothing about the room seemed out of place, yet something about it felt terribly wrong to her trained, experienced eye. Holloway knelt beside the body, noticing the faint smell of bitter almonds and the wet footprints leading toward the study.
created_at
"2026-10-09T09:47:03.161Z"
10/9/2026, 9:47:03 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2430
moderation_latency
(null)
generation_time
6832
tokens_prompt
46
tokens_completion
315
native_tokens_prompt
62
native_tokens_completion
1238
native_tokens_completion_images
(null)
native_tokens_reasoning
1018
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
0.0006252
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791539223-VZPDlWxSfZhhj2fy66bZ"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791539223-5IkuKEZaTk17C0CFQIy5"
upstream_id
"msg_011CfrT7vJkRESVb1LKLiS3P"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfrT7vJkRESVb1LKLiS3P"
is_byok
false
latency
735
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0006252
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Claude Platform on AWS"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
5
wordCounts
0
20
1
20
2
20
3
20
4
20