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Run: 2026-07-09-01KX3ZZX3W3B8FVNJ0QPX2218M
Run Details
Model:
GPT-5.6 Terra (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.9s
Cost:
$0.013678
Provider:
OpenAI
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
Rain battered Blackthorn Hall as Inspector Mara Venn arrived, carrying a soaked warrant and an old grief beneath her coat. Inside, twelve guests stood silent around the library fire, watching the clock bleed minutes toward midnight without speaking or moving. At the center lay Gideon Vale, the wealthy host, smiling faintly despite the silver letter opener lodged in his throat. Nobody claimed to have heard a struggle, yet every face reflected the same private terror when lightning exposed the corpse. Mara noticed muddy footprints crossing the Persian rug, beginning beside the conservatory door and ending abruptly beneath Vale's overturned chair. Then the butler coughed, and a small brass key rolled quietly from his sleeve to rest against Mara's polished boot. Before anyone could speak, the grandfather clock struck twelve, and Vale's dead hand closed tightly around a second matching key.
created_at
"2026-07-09T17:49:44.454Z"
7/9/2026, 5:49:44 PM
model
"openai/gpt-5.6-terra-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
6263
moderation_latency
(null)
generation_time
8708
tokens_prompt
46
tokens_completion
235
native_tokens_prompt
41
native_tokens_completion
905
native_tokens_completion_images
0
native_tokens_reasoning
730
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
"completed"
service_tier
"default"
usage
0.0136775
router
(null)
provider_responses
0
endpoint_id
"3cc89000-ae34-4dde-9c7d-5ce009c8af0b"
id
"resp_02c2876d02f03038016a4fdf38867c81958e40c3a796a862d5"
is_byok
false
latency
213
model_permaslug
"openai/gpt-5.6-terra-20260709"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer
(null)
request_id
"req-1783619384-MzZy8RSlYet2dHglWkfq"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783619384-5M4mkXBWsh3gifWfeeLE"
upstream_id
"resp_02c2876d02f03038016a4fdf38867c81958e40c3a796a862d5"
total_cost
0.0136775
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
data_region
"global"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20