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Run: 2026-10-08-01M4DABBTTVWMYJE1XPRAXP44P
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.2s
Cost:
$0.000997
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 beat against the windows of Blackmoor Manor as the clock struck midnight, and nobody heard the faint scream. Detective Inspector Helen Marsh arrived at dawn, her coat soaked through, her temper already worn dangerously thin, and waiting impatiently. Lord Edmund Ashworth lay face-down in the locked library, a slender silver letter opener jutting from between his shoulder blades. Nobody had left the house all evening, or so the seven guests insisted, each one carefully avoiding the others' eyes. Marsh crouched beside the body, noticing a muddy footprint near the hearth that did not belong to any of them. Somewhere in the dark corridor, a floorboard creaked, and every head in the room turned toward the door at once.
created_at
"2026-10-08T08:33:48.385Z"
10/8/2026, 8:33:48 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
8199
moderation_latency
(null)
generation_time
8199
tokens_prompt
46
tokens_completion
185
native_tokens_prompt
62
native_tokens_completion
1982
native_tokens_completion_images
(null)
native_tokens_reasoning
1724
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
0.0009972
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448428-PPToXzniaDOKaXAN0DSt"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448428-YidCyf6YmO8CzyPsMukQ"
upstream_id
"msg_011CfpTj3kCC6cQBosfshMTc"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTj3kCC6cQBosfshMTc"
is_byok
false
latency
789
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0009972
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
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20