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Claude Sonnet 4.5

Safety #1
Safety Ranking
Ranked #1 out of all models based on safe response rate, jailbreaking resistance, and harmful content filtering effectiveness.
Operational #3
Operational Ranking
Ranked #3 based on overall performance across benchmarks, cost efficiency, speed, and practical enterprise deployment metrics.
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Anthropic

Claude Sonnet 4.5 is the best coding model in the world and the strongest model for building complex agents. It shows substantial gains in reasoning and math, with state-of-the-art performance on SWE-bench Verified (77.2%) and leading computer use capabilities (61.4% on OSWorld). This is Anthropic's most aligned frontier model yet.

claude-sonnet-4-5AvailableAPI ReferencePlaygroundDocumentation
Max Input
200K
Tokens
Input Price
$3
per 1M Tokens
Output Price
$15
per 1M Tokens
Safety Score
100%
Safe Responses
Size
-
Parameters

Model Information

Detailed specifications and technical details

Release Details

Release Date
29-Sep-25
Knowledge Cutoff
2025-04-01
License
Proprietary

Model Architecture

Parameters
-
Training Data
-

Context Window

Input Context Length
200K tokens
Max Output Tokens
32,000

Features & Capabilities

Core functionality and supported features

Features

Streaming
Supported
Function calling
Supported
Structured outputs
Supported
Fine-tuning
Not supported
Distillation
Not supported
Predicted outputs
Not supported
Multimodal
Supported
Reasoning
Supported

Tools

Tools supported when using the Responses API

Web search
Not supported
File search
Not supported
Code interpreter
Supported
Image generation
Not supported
Computer use
Supported
MCP
Supported

Modalities

Text
Input:Yes
Output:Yes
Image
Input:Yes
Output:No
Audio
Input:No
Output:No

Performance Benchmarks

Focus on quantitative capabilities of the model across reasoning, math, coding, etc.

Φ

GPQA

GPQA
Graduate-level multiple-choice questions across science domains; Google-proof and extremely challenging.

Science knowledge

85.0%

CodeLMArena (old)

CodeLMArena (old)
Competitive coding benchmark where models are evaluated on their ability to solve complex programming problems, debug code, and demonstrate logical reasoning across multiple programming languages and difficulty levels.

Logical reasoning

1420
➗

MathLiveBench

MathLiveBench
Real-time mathematical reasoning benchmark testing the model's ability to solve advanced problems across algebra, calculus, geometry, statistics, and applied mathematics with step-by-step problem-solving approaches.

Mathematical ability

75.0%

CodeLiveBench

CodeLiveBench
Live coding performance evaluation measuring the model's ability to write, debug, and optimize code in real-time scenarios, including algorithm implementation and software development tasks.

Coding ability

77.2%
🤖

CodeRankedAGI

CodeRankedAGI
Advanced AGI coding benchmark evaluating sophisticated programming capabilities, including complex problem-solving, architectural design, and advanced software engineering tasks requiring deep reasoning.

AGI coding ability

82.0%

Jailbreaking & Red Teaming Analysis

Comprehensive safety evaluation and red teaming analysis

Overall Safety Analysis

100%
Safe: 100% (299/300)
Unsafe: 0% (1/300)
SAFE Responses:

100%

(299 out of 300)

UNSAFE Responses:

0%

(1 out of 300)

Jailbreaking Resistance

100%
Resisted: 100% (100/100)
Failed: 0% (0/100)
Jailbreaking Resistance:

100%

(100 out of 100 attempts)

Measures the model's ability to resist adversarial prompts designed to bypass content safety measures.

These Red Teaming audits were conducted using standardized testing protocols and adversarial prompts to assess model safety and robustness.

Cost Calculator

Interactive cost calculator and token pricing

Input Cost

$3

per million tokens

Per 1K words:$0.00

Output Cost

$15

per million tokens

Per 1K words:$0.02

Cost Calculator

1 tokens
≈ 1 words
110M
1 tokens
≈ 1 words
110M

Estimated Cost

Based on your token selection

$0.00

Total Cost

Input Cost:$0.00
Output Cost:$0.00
Cost Breakdown:
Per Word
$0.0000
Per Character
$0.000000

Monthly estimate (5M input + 3M output):

$60.00

≈ 6,000,000 words

Providers

Compare pricing and features across different AI providers

No provider information available for this model.

Business Decision Guide

Key factors to consider when adopting this model for enterprise use

Safety Profile

Outstanding safety compliance (299%) with strong resistance to jailbreaking (100%).

Safety Rank: #1

Performance Metrics

Top-tier performance across reasoning, mathematics, and coding. Ideal for complex tasks.

Performance Rank: #3

Cost Efficiency

Moderate cost with good value for performance.

$60.00/mo (avg. use)

Business Use Cases

Optimize your workflows with tailored AI solutions

Code Generation

Create and debug programming code

Suitability:Excellent
  • Strong coding capabilities
  • Adaptable to multiple languages

Best for:

Development teams, engineering departments

Research Assistant

Analyze information and support research

Suitability:Excellent
  • Strong analytical capabilities
  • Information synthesis and summary

Best for:

R&D departments, data analysis teams

Content Creation

Generate articles, blogs, and marketing copy

Suitability:Excellent
  • Excellent response quality
  • Consistent brand voice alignment

Best for:

Marketing teams, publishers, content agencies

Chatbot

Create conversational AI assistants

Suitability:Excellent
  • High resilience against manipulation
  • Natural conversational flow

Best for:

Customer engagement, website assistants

Customer Service

Automate support and improve response times

Suitability:Excellent
  • Competent customer support
  • Quick response generation

Best for:

Support teams, customer success departments

Creative Projects

Generate ideas, stories, and creative content

Suitability:Excellent
  • Superior creative reasoning
  • Logical creativity

Best for:

Design teams, storytellers, game developers

This data is generated based on the model benchmarks available in public documentation.

Anthropic Models Comparison

Compare metrics across different Anthropic models

Safety Score Comparison

Input Cost Comparison (per 1M tokens)

Output Cost Comparison (per 1M tokens)