Run: 2026-10-09-01M4FZ7CRT1X8TZZMQG899MJEM

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
5.9s
Cost:
$0.000503
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the cobblestones tonight. Detective Mara Voss arrived late. Blood pooled beneath the door. The victim was Edmund Hale. A brass letter opener protruded. Nobody had heard the shot. The housekeeper clutched trembling hands. Mara knelt beside the body. Something glittered under the desk. Gloved fingers reached for it. Then the lights went out. Someone screamed in the darkness. Someone in this house lied.
created_at"2026-10-09T09:17:07.233Z" 10/9/2026, 9:17:07 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2496
moderation_latency(null)
generation_time5873
tokens_prompt46
tokens_completion194
native_tokens_prompt62
native_tokens_completion994
native_tokens_completion_images(null)
native_tokens_reasoning827
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
service_tier"default"
usage0.0005032
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791537427-N0B7GaHn2HAV5DyEKIyM"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791537427-AtWkW4UtUFrQNDUsAkqk"
upstream_id"msg_011CfrQqXnEuAH63ZKbnPp8F"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfrQqXnEuAH63ZKbnPp8F"
is_byokfalse
latency677
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0005032
cache_discount(null)
upstream_inference_cost0
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
neededCleanfalse
sentences13
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125