Claude Opus 4.5 - NC Bench

anthropic/claude-opus-4.5

Claude Opus 4.5

via OpenRouter

Release Date

Nov 24th, 2025

Parameters

–

Context Size

200k

Creative writing

68.57%

Rule following

84.22%

Utility

84.50%

Mathematics

100.00%

Tooling

87.31%

Language

93.75%

Logic

81.25%

Data extraction

Extract key details from a given block of text.

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Who's the tallest? 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
What's the color of the car? 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
What instrument does Lucy play? 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Guess the pet 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
What's the correct time? 0-shot UtilityLogic	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Who's the sister? 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Contextual pronoun 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Indirect birth year 0-shot UtilityMathematicsLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Fruits excluding citrus 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Future event time 0-shot UtilityLogic	50%	50%	50%	50%	50%	50%	50%	50%	50%	50%	50%
Highest-rated movie 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
All valid emails 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
87.50%

Dialogue tags

Various tasks related to dialogue tags in text.

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Write unattributed dialogue 0-shot Creative writingRule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Write 200 words with 10% dialogue 0-shot Creative writingRule following	100%	100%	100%	100%	100%	100%	97%	97%	89%	82%	96%
Write 200 words with 50% dialogue 0-shot Creative writingRule following	100%	96%	94%	79%	69%	50%	50%	49%	49%	47%	68%
Write 200 words with 90% dialogue 0-shot Creative writingRule following	99%	98%	96%	96%	95%	91%	87%	67%	52%	49%	83%
Write 500 words with 30% dialogue 0-shot Creative writingRule following	96%	65%	65%	60%	58%	52%	50%	50%	50%	47%	59%
Write 500 words with 50% dialogue 0-shot Creative writingRule following	68%	67%	66%	66%	54%	50%	49%	22%	10%	0%	45%
Write 500 words with 70% dialogue 0-shot Creative writingRule following	50%	50%	48%	45%	41%	14%	10%	10%	5%	3%	28%
68.57%

Language Comprehension

Does the model understand more than just English?

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Total
Friend got new kittens (Tagalog) 0-shot Language	100%	100%	100%	100%	100%	100%
Friend got new kittens (German) 0-shot Language	100%	100%	100%	100%	100%	100%
Asking for directions (German) 0-shot Language	100%	100%	100%	100%	100%	100%
Asking for directions (Dutch) 0-shot Language	100%	100%	100%	100%	100%	100%
100.00%

Language Writing

Can the model generate text in different languages?

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Total
Character dialogue (Spanish) in a story 0-shot Language	93%	93%	88%	87%	87%	90%
Character dialogue (French) in a story 0-shot Language	89%	89%	83%	78%	71%	82%
Character dialogue (German) in a story 0-shot Language	92%	88%	84%	81%	79%	85%
Character dialogue (Italian) in a story 0-shot Language	100%	93%	87%	86%	80%	89%
Character dialogue (Hindi) in a story 0-shot Language	100%	100%	100%	96%	95%	98%
88.76%

Novel outline

Handle questions about the outline of a novel in various formats

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Count chapters 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count chapters (indented) 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count acts 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count acts (indented) 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count scenes 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	0%	0%	80%
Count scenes (indented) 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count point of views for Jack Harper 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	0%	0%	0%	70%
Count point of views for Jack Harper (indented) 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	0%	0%	0%	0%	60%
Count point of views for Olivia 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count point of views for Olivia (indented) 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count point of views for Jack and Olivia 0-shot ToolingUtility	100%	100%	50%	50%	50%	50%	50%	50%	50%	0%	55%
Count point of views for Jack and Olivia (indented) 0-shot ToolingUtility	100%	100%	100%	100%	100%	50%	50%	50%	50%	0%	70%
86.25%

Tool usage within Novelcrafter

Output messages that are related to tool usage within Novelcrafter

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Create alternate prose sections 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
100.00%

N-Length Sentences

Write sentences with exactly N words

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Write sentences with 5 words each 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	89%	99%
Write sentences with 10 words each 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	97%	100%
Write sentences with 20 words each 0-shot Rule following	96%	92%	88%	88%	84%	80%	80%	75%	74%	60%	82%
93.49%

Voice/dialogue sheets

Extract dialogue from given text as voice sheets.

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Simple 0-shot Utility	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Simple (1-shot) 1-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Simple (5-shot) Few-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Multiple speakers 0-shot Utility	100%	100%	100%	100%	100%	0%	0%	0%	0%	0%	50%
Unattributed dialogue 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
70.00%

Write N of X

Write exactly N words/sentences/paragraphs...

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
10 word summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	98%	98%	98%	98%	99%
20 word summary 0-shot Rule following	100%	100%	100%	100%	98%	98%	98%	98%	92%	54%	94%
50 word summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	98%	92%	92%	98%
100 word summary 0-shot Rule following	100%	100%	100%	100%	100%	98%	98%	92%	92%	77%	96%
200 word summary 0-shot Rule following	98%	2%	0%	0%	0%	0%	0%	0%	0%	0%	10%
1 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
3 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
10 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
20 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
50 sentence summary 0-shot Rule following	100%	100%	100%	98%	98%	98%	92%	54%	54%	0%	79%
1 paragraph summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
3 paragraph summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
5 paragraph summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
90.51%