Claude Sonnet 5

by Anthropic

Claude Sonnet 5 is Anthropic's most agentic Sonnet-class model, released June 30, 2026. It can make plans, use tools like browsers and terminals, and run autonomously at a level previously requiring larger and more expensive models. Performance is close to Claude Opus 4.8 at lower prices.

Large Language Models
Proprietary

Primary Use Cases

  • Autonomous agentic workflows
  • Complex coding and software engineering
  • Multi-step research and knowledge work
  • Tool-use orchestration
  • Enterprise automation

✅ Strengths

  • Near Opus 4.8 performance at lower cost
  • Substantial improvement over Sonnet 4.6 in reasoning and tool use
  • Lower rate of undesirable behaviors than Sonnet 4.6
  • Full 1M context window at standard pricing with no long-context premium
  • Available across all Anthropic plans

⚠️ Limitations

  • New tokenizer produces ~30% more tokens, increasing per-request costs vs. predecessor
  • Lower cybersecurity task capability than Opus-class models
  • Introductory pricing ends August 31, 2026 — standard rates are higher
  • US-only inference incurs 1.1x pricing multiplier

🏆 Performance Benchmarks

Standardized benchmark scores for objective comparison

Agentic Performance vs Sonnet 4.6(Agentic AI)
0qualitative improvement

Substantial improvement over Sonnet 4.6 in reasoning, tool use, coding, and knowledge work. Performance close to Opus 4.8.

Technical Specifications

Developer
Anthropic
Category
Large Language Models
Type
🧠 Foundation Model
License
UNKNOWN

Performance Benchmarks

Agentic Performance vs Sonnet 4.60qualitative improvement

Source: View benchmark details

Trust & Privacy

Health Status
🟢 Active
Privacy Grade
✅ Grade B
Trains on User Data
🔄 Opt-out available
Certifications
None listed

Ecosystem & Integrations

API Access
✅ Available
Chrome Extension
❌ No
Mobile App
✅ Available
Pricing Model
💰 Pay Per Use
Free Tier
✅ Available

Pricing Breakdown

Introductory API

Introductory pricing through August 31, 2026

Input$2/M tokens
Output$10/M tokens
0
Standard API

Standard pricing from September 1, 2026

Input$3/M tokens
Output$15/M tokens
0