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Run: 2026-10-08-01M4DADBXDBMRHHG4DF7CB0ESS
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
15.5s
Cost:
$0.001908
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 been falling steadily over Harrow Manor since midnight, turning every gravel path into dark, muddy, sluggish streams. Detective Inspector Eleanor Vance stood at the mansion's threshold, her collar turned up against the bitter wind off the moors. Behind her, the constable juggled a flashlight, a clipboard, and a paper cup of tea gone stone cold long ago. Inside, the dead man's study was unnaturally warm, lit by a single brass lamp that had burned all night long. Victor Ashworth lay slumped across his mahogany desk, one hand still clutching an empty crystal tumbler stained with amber whiskey. Eleanor crossed the Persian rug in silence, noting the overturned chair, the shattered decanter, and the open window swinging gently. Nothing in the room suggested a violent struggle, which troubled Eleanor far more than any spilled blood could possibly have. Somewhere above them, a heavy oak door creaked open, and footsteps descended the grand staircase with unhurried, almost theatrical certainty.
created_at
"2026-10-08T08:34:54.005Z"
10/8/2026, 8:34:54 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
15433
moderation_latency
(null)
generation_time
15433
tokens_prompt
46
tokens_completion
253
native_tokens_prompt
62
native_tokens_completion
3803
native_tokens_completion_images
(null)
native_tokens_reasoning
3448
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
0.0019077
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448494-sO4uWQ9D5POY65clL0OT"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448494-UQB3O4ca64TCS0zCo7ON"
upstream_id
"msg_011CfpTotVE35EKTw7XD3RUD"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTotVE35EKTw7XD3RUD"
is_byok
false
latency
790
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0019077
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