Run: 2026-05-29-01KSSK3R4K7JNMAB3J5JTFZ7RQ

Run Details

Model:
Claude Opus 4.8 (Reasoning)
Test:
Data extraction
Scenario:
What instrument does Lucy play?
Duration:
2.1s
Cost:
$0.000655
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
Pass Matches text (details)
Pass Matches Regex (details)
no eval Overall

Model input

User/Human
What instrument does Lucy play based on the following text? Only return the instrument, nothing else. In the school band, there are four instruments: drums, bass, flute, trumped. John plays the drums, Mary plays the flute, and Pete plays the trumpet. Lucy doesn't play a wind instrument.

Model response

AI
Bass
created_at"2026-05-29T10:05:09.149Z" 5/29/2026, 10:05:09 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1912
moderation_latency(null)
generation_time2105
tokens_prompt75
tokens_completion1
native_tokens_prompt106
native_tokens_completion5
native_tokens_completion_images(null)
native_tokens_reasoning0
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"
usage0.000655
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01MJEyzRZYxv8st5wsEqTfvE"
is_byokfalse
latency1912
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780049109-nh7s8WY1KDRQHgk0Uuwt"
session_id(null)
api_type"completions"
id"gen-1780049109-MB593SXuk5RziXiaftJH"
upstream_id"msg_01MJEyzRZYxv8st5wsEqTfvE"
total_cost0.000655
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
Pass Matches text
Case insensitive: bass
 n/a
Pass Matches Regex
/\bbass\b/i
 n/a
no eval