Claude Sonnet 4 vs Claude Sonnet 4.5
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Claude Sonnet 4 vs Claude Sonnet 4.5: side by side
| Spec | Claude Sonnet 4 | Claude Sonnet 4.5 | Winner |
|---|---|---|---|
| Intelligence | — | — | Tie |
| Output speed | — | — | Tie |
| Output price | $15.00/1M | $15.00/1M | Tie |
| Context | 1000K | 1000K | Tie |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | Anthropic | Anthropic | Tie |
Claude Sonnet 4
Pros
- +Strong reasoning and coherence over long inputs
- +Careful safety alignment
- +High-quality, detailed responses
- +Effective multimodal integration
Cons
- –Conservative refusals on sensitive topics
- –No native audio or video support
- –May prioritize caution over maximum helpfulness
Claude Sonnet 4.5
Pros
- +Strong safety alignment
- +Reliable handling of large contexts
- +Careful and detailed reasoning
- +Effective multimodal file support
Cons
- –Can be overly cautious with refusals
- –Vision performance varies by image complexity
- –May produce verbose responses
Frequently asked questions
It depends on your needs. Claude Sonnet 4 and Claude Sonnet 4.5 are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.