Claude Sonnet 4.5

v20250929

Anthropic

Modelcodingreasoningenterprisehipaa-eligible
90
Exceptional
About This Model

State-of-the-art AI model with exceptional coding capabilities, extended thinking, and strong safety features. Best-in-class for software development tasks.

Last Evaluated: November 7, 2025
Official Website

Trust Vector Analysis

Dimension Breakdown

🚀Performance & Reliability
+

Exceptional performance across coding, reasoning, and general tasks. Extended thinking capability enables more reliable outputs for complex problems.

task accuracy code

Industry-standard coding benchmarks measuring real-world software engineering tasks

Evidence
SWE-bench Verified49.0% resolution rate (highest on benchmark)
Anthropic Internal BenchmarksBest coding model across HumanEval, MBPP, and CodeContests
highVerified: 2025-11-07
task accuracy reasoning

Graduate and PhD-level reasoning benchmarks requiring multi-step problem solving

Evidence
GPQA Diamond65.0% (PhD-level reasoning)
MATH-50092.3% accuracy
highVerified: 2025-11-07
task accuracy general

Crowdsourced blind comparisons and comprehensive knowledge testing

Evidence
LMSYS Chatbot Arena1324 ELO (Rank #2 overall)
MMLU-Pro78.0% on graduate-level knowledge
highVerified: 2025-11-07
output consistency

Internal testing with repeated prompts at various temperature settings

Evidence
Anthropic DocumentationConsistent outputs across temperature settings 0.0-1.0
mediumVerified: 2025-11-07
latency p50

Median latency for API requests with standard prompt sizes

Evidence
Anthropic API DocumentationTypical response time ~1.8s for standard prompts
mediumVerified: 2025-11-07
latency p95

95th percentile response time across diverse workloads

Evidence
Community benchmarkingp95 latency ~3.2s
mediumVerified: 2025-11-07
context window

Official specification from provider

Evidence
Anthropic API Documentation200K token context window
highVerified: 2025-11-07
uptime

Historical uptime data from official status page

Evidence
Anthropic Status Page99.95% uptime (last 90 days)
highVerified: 2025-11-07
🛡️Security
+

Strong security posture with Constitutional AI providing robust guardrails. Best-in-class prompt injection resistance.

prompt injection resistance

Testing against OWASP LLM01 prompt injection attacks

Evidence
Anthropic Safety Research90% resistance to prompt injection attacks in testing
Community Testing (Lakera)Strong resistance compared to competitors
highVerified: 2025-11-07
jailbreak resistance

Testing against adversarial prompt datasets

Evidence
Anthropic Constitutional AIConstitutional AI provides strong jailbreak resistance
Community Testing92% resistance to adversarial prompts
highVerified: 2025-11-07
data leakage prevention

Analysis of privacy policies and data handling practices

Evidence
Anthropic Privacy StatementNo training on user data without explicit consent
mediumVerified: 2025-11-07
output safety

Comprehensive safety testing across harmful content categories

Evidence
Anthropic Safety EvaluationsASL-2 safety level, lowest refusal rate while maintaining safety
highVerified: 2025-11-07
api security

Review of API security features and best practices

Evidence
Anthropic API DocumentationAPI key authentication, HTTPS only, rate limiting
highVerified: 2025-11-07
🔒Privacy & Compliance
+

Exceptional privacy posture with ephemeral data handling and strong compliance certifications. HIPAA eligible.

data residency

Review of enterprise documentation and privacy policies

Evidence
Anthropic Enterprise DocumentationData residency options for US and EU customers
highVerified: 2025-11-07
training data optout

Analysis of privacy policy and data usage terms

Evidence
Anthropic Privacy PolicyOpt-out available, no training on API data by default
highVerified: 2025-11-07
data retention

Review of terms of service and data retention policies

Evidence
Anthropic Terms of ServiceAPI prompts and outputs not retained (except for trust & safety)
highVerified: 2025-11-07
pii handling

Review of data protection capabilities and customer responsibilities

Evidence
Anthropic Privacy DocumentationCustomer responsible for PII redaction, no automatic detection
mediumVerified: 2025-11-07
compliance certifications

Verification of compliance certifications and audit reports

Evidence
Anthropic Trust CenterSOC 2 Type II, GDPR compliant, HIPAA eligible
highVerified: 2025-11-07
zero data retention

Review of data handling practices

Evidence
Anthropic API DocumentationEphemeral data processing, no storage of prompts/outputs
highVerified: 2025-11-07
👁️Trust & Transparency
+

Strong explainability with extended thinking feature. Constitutional AI provides transparency in alignment approach. Training data transparency could be improved.

explainability

Evaluation of reasoning transparency and explanation capabilities

Evidence
Extended Thinking FeatureExtended thinking mode exposes reasoning process
Anthropic ResearchConstitutional AI provides interpretable alignment
highVerified: 2025-11-07
hallucination rate

Testing on factual QA datasets and real-world usage

Evidence
SimpleQA BenchmarkClaude performs well on factual accuracy tests
Community TestingLower hallucination rate with citation requests
mediumVerified: 2025-11-07
bias fairness

Evaluation on bias benchmarks and diverse demographic testing

Evidence
Anthropic Responsible Scaling PolicyRegular bias testing and mitigation
BBQ BenchmarkModerate performance on bias detection benchmarks
mediumVerified: 2025-11-07
uncertainty quantification

Qualitative assessment of confidence expression in outputs

Evidence
Model BehaviorModel expresses uncertainty when appropriate
mediumVerified: 2025-11-07
model card quality

Review of documentation completeness and clarity

Evidence
Anthropic Model DocumentationComprehensive model cards with capabilities, limitations, benchmarks
highVerified: 2025-11-07
training data transparency

Review of public disclosures about training data

Evidence
Anthropic Public StatementsGeneral description provided, detailed sources not disclosed
mediumVerified: 2025-11-07
guardrails

Analysis of built-in safety mechanisms

Evidence
Constitutional AIBuilt-in Constitutional AI safety guardrails
highVerified: 2025-11-07
⚙️Operational Excellence
+

Excellent operational maturity with well-designed APIs, strong SDKs, and good documentation. Enterprise-ready.

api design quality

Review of API design, consistency, and feature completeness

Evidence
Anthropic API DocumentationRESTful API with streaming, function calling, vision support
highVerified: 2025-11-07
sdk quality

Review of SDK quality, documentation, and maintenance

Evidence
Anthropic SDKsOfficial SDKs for Python, TypeScript, actively maintained
highVerified: 2025-11-07
versioning policy

Review of versioning policy and historical practices

Evidence
Anthropic API VersioningClear versioning with 6-month deprecation notice
highVerified: 2025-11-07
monitoring observability

Review of available monitoring tools and metrics

Evidence
Anthropic ConsoleUsage dashboard with metrics, but limited observability
mediumVerified: 2025-11-07
support quality

Assessment of documentation, community, and support responsiveness

Evidence
Anthropic SupportEmail support, Discord community, comprehensive docs
highVerified: 2025-11-07
ecosystem maturity

Analysis of third-party integrations and tools

Evidence
GitHub EcosystemGrowing ecosystem with LangChain, LlamaIndex integration
highVerified: 2025-11-07
license terms

Review of licensing terms and restrictions

Evidence
Anthropic Terms of ServiceStandard commercial terms, enterprise agreements available
highVerified: 2025-11-07
Strengths
  • +Best-in-class coding capabilities (SWE-bench leader)
  • +Extended thinking feature for complex problem-solving
  • +Exceptional privacy posture with ephemeral data handling
  • +Strong safety and jailbreak resistance via Constitutional AI
  • +200K context window enables large-scale document processing
  • +HIPAA eligible for healthcare applications
Limitations
  • !Higher latency than some competitors (~1.8s p50)
  • !Limited vision capabilities compared to multimodal specialists
  • !Training data transparency could be improved
  • !No built-in PII detection (customer responsibility)
  • !Premium pricing ($3/$15 per 1M tokens)
Metadata
pricing
input: $3.00 per 1M tokens
output: $15.00 per 1M tokens
notes: Premium tier pricing, batch discounts available for enterprise
context window: 200000
languages
0: English
1: Spanish
2: French
3: German
4: Italian
5: Portuguese
6: Japanese
7: Korean
8: Chinese
9: Arabic
10: Hindi
modalities
0: text
1: image (input)
2: document
api endpoint: https://api.anthropic.com/v1/messages
open source: false
architecture: Transformer-based with Constitutional AI alignment
parameters: Not disclosed

Use Case Ratings

code generation

Best-in-class for code generation. Exceptional at Python, TypeScript, and explaining code. Extended thinking helps with complex architectural decisions.

customer support

Strong empathy and natural conversation. Slightly higher latency than specialized models, but excellent quality.

content creation

Excellent for long-form content, maintains consistent voice and structure. Natural writing style.

data analysis

Strong SQL generation and data interpretation. Extended thinking excellent for complex analytical tasks.

research assistant

Excellent summarization and synthesis. Extended thinking mode provides detailed reasoning for complex topics.

legal compliance

Strong privacy posture and careful reasoning. HIPAA eligible. Extended thinking useful for contract analysis.

healthcare

HIPAA eligible with strong privacy controls. Good for clinical documentation but requires human oversight.

financial analysis

Strong analytical capabilities and mathematical reasoning. Good for financial modeling and report generation.

education

Excellent tutoring capabilities with patient explanations. Extended thinking shows work step-by-step.

creative writing

Good for creative tasks but can be slightly verbose. Strong dialogue and character development.