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Run: 2026-10-08-01M4DYT5NKXA235E00360SPCT3
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
9.4s
Cost:
$0.001077
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 fell steadily over Harrow Manor, washing the gravel paths clean of footprints while the dark night slowly deepened. Inside the drawing room, Detective Inspector Eleanor Vance stood beside the body of Lord Edmund Ashworth, the wealthy shipping magnate. His throat bore a thin red line, and the crystal decanter beside him lay shattered upon the faded Persian carpet. Nobody in the household had heard a single cry, and every clock in the house had stopped at exactly midnight. Vance crouched beside the fireplace, noticing a glove print etched faintly into the ash, far too small for any guest. Behind her, Sergeant Thomas Greaves cleared his throat, reminding her that the family had gathered in the great library downstairs. Every one of them had a motive, and every one of them had lied at least once since dinner ended. Vance pulled on her gloves, took a breath, and walked toward the library door, knowing the truth waited somewhere inside.
created_at
"2026-10-08T14:31:25.117Z"
10/8/2026, 2:31:25 PM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2290
moderation_latency
(null)
generation_time
9406
tokens_prompt
46
tokens_completion
527
native_tokens_prompt
62
native_tokens_completion
2142
native_tokens_completion_images
(null)
native_tokens_reasoning
1808
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
0.0010772
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791469885-zF8ht1R9dVjPI8epXAbZ"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791469885-Iaw3rGBCMTLhv5wD89Vx"
upstream_id
"msg_011CfpvzigKDF9ZibFmaFxBb"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpvzigKDF9ZibFmaFxBb"
is_byok
false
latency
790
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0010772
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20