Anthropic: Claude Opus 4.1

by Anthropic

Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains in multi-file code refactoring, debugging precision, and detail-oriented reasoning. The model su...

*Artificial Analysis‡Kilo Code Leaderboard†OpenRouter
Release Date
August 5, 2025
Context Window
200,000 tokens
Max Output
32,000 tokens
Input Modalities
imagetextfile

Coding Performance

Coding benchmarks and performance metrics for development tasks

Coding Benchmarks

Artificial Analysis Coding Index

46.1%

Overall coding capability score

LiveCodeBench

65.4%

Real-world coding task performance

SciCode

40.9%

Scientific computing & algorithms

TerminalBench Hard

32.1%

CLI & terminal command generation

LCR (Long Context Reasoning)

66.3%

Understanding large codebases

IFBench

55.4%

Instruction following accuracy

Speed & Efficiency

Output Speed

39.3 tokens/sec

Median output tokens per second

Time to First Token

1.4s

Median responsiveness

Performance metrics from Artificial Analysis

Real-World Usage

Real-world usage statistics from the Kilo Code community

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Real-world metrics from the Kilo Code Leaderboard

Pricing

Cost per 1 million tokens

Input Tokens
$15.00
per 1M tokens
Output Tokens
$75.00
per 1M tokens
Blended (3:1 ratio)
$30.00
per 1M tokens

Example Cost

Analyzing a 10,000 line codebase (≈40k input tokens, 10k output tokens) costs approximately $1.3500

Coding Capabilities

Features and parameters relevant to coding tasks

Coding Features

Function Calling
Can call external functions/APIs
Tool Choice
Control over function selection
Structured Outputs
JSON schema validation
Reasoning Tokens
Extended thinking for complex problems

Pricing details from OpenRouter

Technical Details

Architecture and implementation specifications

Model ID
anthropic/claude-opus-4.1
Created
August 5, 2025
Tokenizer
Claude
Input Modalities
image, text, file
Context Window
200,000 tokens
Max Completion Tokens
32,000 tokens
Input Price
$15.00 per 1M tokens
Output Price
$75.00 per 1M tokens
Cache Read Price
$1.50 per 1M tokens
Cache Write Price
$18.75 per 1M tokens
Content Moderation
Disabled

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