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Run: 2026-10-08-01M4DAHW2Q2QT1CK1883K8FY2Z
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
13.4s
Cost:
$0.001785
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The rain fell hard on Ashford Manor that cold night. Detective Mara Quill arrived just after midnight, soaked and silent. The body lay face down beside the library's oak door. Lord Edmund Ashford had been found there just before dawn. A single bullet had pierced his heart before he fell. Nobody in the old household admitted hearing that fatal gunshot. Mara knelt beside the body and studied the scattered papers. Someone had carefully torn several pages from the victim's diary. Her partner, Inspector Tom Reyes, frowned at the fresh footprints. Those muddy prints led straight toward the locked east wing. Mara followed them, her flashlight trembling in the bitter cold. Halfway down the dim corridor, she stopped suddenly and listened. Somewhere above, a door creaked open, then quietly closed again. Heavy footsteps followed, slow and deliberate, descending the narrow stairs. Mara drew her revolver and whispered one sharp, urgent word. Nobody answered, and the footsteps suddenly stopped at the landing. In that silence, Mara heard only her own ragged breathing. Then a low voice whispered her name from the darkness.
created_at
"2026-10-08T08:37:21.628Z"
10/8/2026, 8:37:21 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
13385
moderation_latency
(null)
generation_time
13385
tokens_prompt
46
tokens_completion
286
native_tokens_prompt
62
native_tokens_completion
3557
native_tokens_completion_images
(null)
native_tokens_reasoning
3146
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
0.0017847
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448641-lfxxDfcGDOuynerTnn3Y"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448641-lu4XqWHkDAJXy43uIbOE"
upstream_id
"msg_011CfpTzmTMm5Z1rYhfeKUgK"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTzmTMm5Z1rYhfeKUgK"
is_byok
false
latency
766
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0017847
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
18
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
15
10
16
10
17
10