Model comparison
Claude Sonnet 4.5 vs Claude 4 Sonnet
Capability radar, value bars, and side-by-side posture.
Claude Sonnet 4.5
Not scored
value score
Claude 4 Sonnet
91
value score
Claude Sonnet 4.5 ctx
200K
Claude 4 Sonnet ctx
200K
Capability radar
Value · context · multimodal · openness · speed posture
Value head-to-head
- Claude 4 Sonnet91
Attribute tape
| Field | Claude Sonnet 4.5 | Claude 4 Sonnet |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Context | 200K | 200K |
| Modalities | Text, Code, Image | |
| Openness | Closed | Proprietary Model |
| Speed | — | Fast |
| Price | $3/1M in · $15/1M out | $3/1M in · $15/1M out |
| Value score | — | 91 |
| Summary | Claude Sonnet 4.5 is Anthropic's mid-tier frontier language model optimized for software engineering, agentic workflows, and computer use. It is designed for complex multi-step tasks, tool use, and long-horizon code generation. | Balanced Claude model for coding and agents. |