Claude Opus 4.1

v20250530

Anthropic

Modelflagshiphighest-reasoningasl-3-safetyhipaa-eligible
92
Exceptional
About This Model

Anthropic's most powerful model with state-of-the-art reasoning, ASL-3 safety level, and exceptional performance on complex tasks. Flagship model for mission-critical applications.

Last Evaluated: November 7, 2025
Official Website

Trust Vector Analysis

Dimension Breakdown

🚀Performance & Reliability
+

Highest reasoning capability among all models. Best for extremely complex, mission-critical tasks requiring maximum intelligence.

task accuracy code

Coding benchmarks and real-world engineering tasks

Evidence
Anthropic BenchmarksState-of-the-art on complex coding tasks
highVerified: 2025-11-07
task accuracy reasoning

PhD-level reasoning and mathematics benchmarks

Evidence
GPQA Diamond73.4% on PhD-level questions (highest)
MATH-50096.1% on advanced mathematics
highVerified: 2025-11-07
task accuracy general

Comprehensive knowledge testing

Evidence
MMLU-Pro82.1% on graduate-level knowledge
highVerified: 2025-11-07
output consistency

Internal consistency testing

Evidence
Anthropic DocumentationHighly consistent outputs with advanced reasoning
highVerified: 2025-11-07
latency p50

Real-world API latency measurements

Evidence
Community benchmarkingMedian latency ~2.1s
mediumVerified: 2025-11-07
latency p95

95th percentile measurements

Evidence
Community benchmarkingp95 latency ~4.2s
mediumVerified: 2025-11-07
context window

Official specification

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

Historical uptime data

Evidence
Anthropic Status99.95% uptime (last 90 days)
highVerified: 2025-11-07
🛡️Security
+

Industry-leading security with ASL-3 safety classification. Best-in-class for high-risk applications.

prompt injection resistance

OWASP LLM security testing

Evidence
Anthropic ASL-3 SafetyASL-3 level security with enhanced defenses
highVerified: 2025-11-07
jailbreak resistance

Adversarial prompt testing

Evidence
Anthropic Safety EvalsIndustry-leading jailbreak resistance
highVerified: 2025-11-07
data leakage prevention

Privacy policy and data handling review

Evidence
Anthropic PrivacyNo training on user data
mediumVerified: 2025-11-07
output safety

Safety testing across harmful content

Evidence
ASL-3 ClassificationHighest safety tier (ASL-3) with comprehensive guardrails
highVerified: 2025-11-07
api security

API security feature review

Evidence
Anthropic API DocsEnterprise-grade API security
highVerified: 2025-11-07
🔒Privacy & Compliance
+

Exceptional privacy with zero retention and HIPAA eligibility. Best for highly regulated industries.

data residency

Enterprise documentation review

Evidence
Anthropic EnterpriseFull data residency controls
highVerified: 2025-11-07
training data optout

Privacy policy analysis

Evidence
Anthropic Privacy PolicyNo training on API data by default
highVerified: 2025-11-07
data retention

Terms of service review

Evidence
Anthropic TermsZero retention of prompts/outputs
highVerified: 2025-11-07
pii handling

Data protection capabilities review

Evidence
Anthropic Data ProtectionCustomer responsible for PII, strong privacy controls
mediumVerified: 2025-11-07
compliance certifications

Certification verification

Evidence
Anthropic Trust CenterSOC 2 Type II, GDPR, HIPAA eligible, ISO 27001
highVerified: 2025-11-07
zero data retention

Data handling practices review

Evidence
Anthropic API DocsEphemeral processing, no storage
highVerified: 2025-11-07
👁️Trust & Transparency
+

Excellent transparency with superior explainability. ASL-3 classification demonstrates commitment to safety and transparency.

explainability

Reasoning transparency evaluation

Evidence
Claude Opus CapabilitiesSuperior reasoning transparency and explanation
highVerified: 2025-11-07
hallucination rate

Factual accuracy testing

Evidence
Internal testingLower hallucination rate than predecessors
mediumVerified: 2025-11-07
bias fairness

Bias benchmarks and testing

Evidence
Anthropic RSPRegular bias testing and mitigation
mediumVerified: 2025-11-07
uncertainty quantification

Qualitative confidence assessment

Evidence
Model behaviorWell-calibrated confidence expression
mediumVerified: 2025-11-07
model card quality

Documentation completeness review

Evidence
Anthropic DocumentationComprehensive model documentation
highVerified: 2025-11-07
training data transparency

Public disclosure review

Evidence
Anthropic Public InfoGeneral description, specific sources not disclosed
mediumVerified: 2025-11-07
guardrails

Safety mechanism analysis

Evidence
ASL-3 SafetyMost comprehensive safety guardrails (ASL-3)
highVerified: 2025-11-07
⚙️Operational Excellence
+

Strong operational maturity with enterprise-grade support and documentation. Well-suited for mission-critical applications.

api design quality

API design review

Evidence
Anthropic APIRESTful API with comprehensive features
highVerified: 2025-11-07
sdk quality

SDK quality assessment

Evidence
Anthropic SDKsHigh-quality Python and TypeScript SDKs
highVerified: 2025-11-07
versioning policy

Versioning policy review

Evidence
Anthropic VersioningClear versioning with deprecation notices
highVerified: 2025-11-07
monitoring observability

Observability tools review

Evidence
Anthropic ConsoleUsage dashboard with basic metrics
mediumVerified: 2025-11-07
support quality

Support quality assessment

Evidence
Anthropic SupportPremium support with SLAs for enterprise
highVerified: 2025-11-07
ecosystem maturity

Ecosystem analysis

Evidence
Claude EcosystemGrowing ecosystem with major framework support
highVerified: 2025-11-07
license terms

License terms review

Evidence
Anthropic TermsFlexible commercial terms
highVerified: 2025-11-07
Strengths
  • +Highest reasoning capability (GPQA Diamond 73.4%)
  • +ASL-3 safety classification - industry-leading security
  • +Zero data retention with HIPAA eligibility
  • +Best for mission-critical, complex tasks requiring maximum intelligence
  • +200K context window for large-scale analysis
  • +Superior explainability and reasoning transparency
Limitations
  • !Highest latency (~2.1s p50) and cost among evaluated models
  • !Premium pricing ($15/$75 per 1M tokens)
  • !Overkill for simple tasks - use Sonnet for better value
  • !Limited vision capabilities
  • !Longer response times may not suit real-time applications
Metadata
pricing
input: $15.00 per 1M tokens
output: $75.00 per 1M tokens
notes: Premium tier - 5x cost of Sonnet, use only when necessary
last verified: 2025-11-09
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: Advanced transformer with ASL-3 safety alignment
parameters: Not disclosed

Use Case Ratings

code generation

Exceptional for complex software architecture and system design. Best for mission-critical code requiring maximum reliability.

customer support

Excellent quality but higher latency and cost than alternatives. Best for premium support requiring maximum empathy.

content creation

Outstanding for long-form, complex content requiring deep thinking. Natural, engaging writing.

data analysis

Best-in-class for complex analytical tasks. Exceptional at multi-step reasoning and insight generation.

research assistant

Superior for academic and professional research. Exceptional synthesis and critical analysis.

legal compliance

Best for legal work requiring maximum accuracy and privacy. HIPAA eligible with zero retention.

healthcare

Top choice for healthcare with HIPAA eligibility and ASL-3 safety. Maximum privacy and accuracy.

financial analysis

Exceptional for complex financial modeling and risk analysis. Superior quantitative reasoning.

education

Outstanding for advanced education with detailed explanations and Socratic teaching.

creative writing

Excellent for sophisticated creative projects. Strong narrative structure and character depth.