Run: 2026-09-29-01M3P2A4RW94ZNT8R9RR3R66YR

Run Details

Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
10.1s
Cost:
$0.010344
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 manor's windows. Inspector Hale shed his coat. The butler stood pale, trembling. Ashworth lay near the hearth. His eyes stared at nothing. A decanter lay shattered nearby. Hale knelt, studying the wound. Someone struck him from behind. "The door was locked, Inspector." "Locked from which side, exactly?" The butler swallowed very hard. "Inside, sir, with the key." "Then the killer never left." Thunder shook the whole house. Somewhere above, a floorboard creaked.
created_at"2026-09-29T07:50:48.024Z" 9/29/2026, 7:50:48 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3370
moderation_latency(null)
generation_time9901
tokens_prompt46
tokens_completion337
native_tokens_prompt62
native_tokens_completion1022
native_tokens_completion_images(null)
native_tokens_reasoning833
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"
usage0.010344
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668248-kAxB6GfGNvkMYOoyZfhl"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668248-3oLsbAlUaluuIZ3vBeOw"
upstream_id"msg_011CfXNAbpwEQbYdqBnvU9Gx"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNAbpwEQbYdqBnvU9Gx"
is_byokfalse
latency731
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.010344
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
sentences15
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145