Claude Sonnet 4
v20250514Anthropic
RETIRED: Anthropic retired Claude Sonnet 4 (claude-sonnet-4-20250514) on 2026-06-15 (deprecated 2026-04-14); API requests now fail. Recommended replacement: Claude Sonnet 4.6. Historically a May 2025 hybrid model with exceptional coding capabilities, advanced reasoning, and extended thinking mode.
Trust Vector Analysis
Dimension Breakdown
🚀Performance & Reliability+
Historical evaluation: exceptional coding performance at release (72.7% SWE-bench) with extended thinking and 200K context. Model retired 2026-06-15 and is no longer served.
Industry-standard coding benchmarks
Graduate-level reasoning benchmarks
Knowledge testing benchmarks
Internal testing with repeated prompts
Median latency for API requests
95th percentile response time
Official specification
Historical uptime data
🛡️Security+
Excellent security with Constitutional AI providing strong guardrails. Best-in-class safety for enterprise use.
Testing against OWASP LLM01 attacks
Testing against adversarial prompts
Analysis of privacy policies
Safety testing across harmful content categories
Review of API security features
🔒Privacy & Compliance+
Exceptional privacy with ephemeral data handling. HIPAA eligible. Strong compliance posture for regulated industries.
Review of enterprise documentation
Analysis of privacy policy
Review of terms of service
Review of data protection capabilities
Verification of compliance certifications
Review of data handling practices
👁️Trust & Transparency+
Strong transparency with Constitutional AI and extended thinking feature. Comprehensive model card available.
Evaluation of reasoning transparency
Testing on factual QA datasets
Evaluation on bias benchmarks
Qualitative assessment
Review of documentation
Review of public disclosures
Analysis of safety mechanisms
⚙️Operational Excellence+
Model retired 2026-06-15 on Anthropic-operated platforms; API requests fail. Migration target is Claude Sonnet 4.6. Versioning, ecosystem, and overall scores reduced to reflect retirement.
Review of API design
Review of SDK quality
Review of versioning
Review of monitoring tools
Assessment of support
Analysis of ecosystem
Review of licensing
- +Exceptional coding performance (72.7% SWE-bench)
- +Hybrid model with extended thinking for complex reasoning
- +Excellent privacy posture with ephemeral data handling
- +HIPAA eligible for healthcare applications
- +Large 200K context window for document processing
- +Constitutional AI provides robust safety
- !RETIRED 2026-06-15 — no longer available on the Claude API; requests fail (migrate to Claude Sonnet 4.6)
- !Higher latency in extended thinking mode
- !Training data cutoff March 2025
- !No built-in PII detection
- !Premium pricing ($3/$15 per 1M tokens)
- !Superseded by Sonnet 4.5, 4.6, and Claude Sonnet 5
Use Case Ratings
code generation
Historically exceptional coding (72.7% SWE-bench). Retired — use Sonnet 4.6 or newer.
customer support
Excellent for customer support with empathetic responses and fast latency.
content creation
Strong content creation with natural writing style. Large context window helpful.
data analysis
Strong analytical capabilities with extended thinking for complex analysis.
research assistant
Excellent for research with strong summarization and 200K context window.
legal compliance
Strong privacy posture (HIPAA eligible) and careful reasoning for legal tasks.
healthcare
HIPAA eligible with strong privacy. Good for clinical documentation with oversight.
financial analysis
Strong financial analysis with extended thinking for complex modeling.
education
Good for educational content with patient explanations and strong knowledge.
creative writing
Strong creative writing with natural style. Good dialogue and character development.