Run: 2026-10-08-01M4DAJBC25RHM1FPP7TRZF10V

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Medium)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
7.2s
Cost:
$0.000591
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 drummed against Blackwood's windows. Detective Mara Quinn arrived late. Lord Edmund Blackwood lay dead. A silver letter opener protruded. Nobody had heard the scream. The butler wrung his hands. Mara knelt beside the body. Three guests remained locked inside. Each of them had motive. Someone had scrubbed the floor. She noticed the clock's absence. Its hands froze at midnight. Murder had arrived before her.
created_at"2026-10-08T08:37:37.29Z" 10/8/2026, 8:37:37 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2347
moderation_latency(null)
generation_time7198
tokens_prompt46
tokens_completion217
native_tokens_prompt62
native_tokens_completion1170
native_tokens_completion_images(null)
native_tokens_reasoning1001
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"
usage0.0005912
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448657-JNgPU9mGYhaWAn0b4ko7"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448657-F6gt1JFWaSsUKsebBspN"
upstream_id"msg_011CfpU1vSPJJXbPXgT6dqsq"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpU1vSPJJXbPXgT6dqsq"
is_byokfalse
latency798
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0005912
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