Grok 4 vs Claude Sonnet 4.5
Side-by-side specs, pricing and capabilities. Both models run on Clade under one subscription, so you can switch between them in the same conversation.
Grok 4 comes from xAI and Claude Sonnet 4.5 from Anthropic. The practical difference for most people is context, price, and which input types each one accepts.
Claude Sonnet 4.5 holds more in a single conversation — 1M tokens against 256K — which matters for long documents and large codebases.
| Specification | Grok 4 | Claude Sonnet 4.5 |
|---|---|---|
| Provider | xAI | Anthropic |
| Model ID | grok-4-0709 | claude-sonnet-4-5-20250929 |
| Context window | 256K | 1M |
| Max output | — | 64K |
| Input price | $3.00 / 1M tokens | $3.00 / 1M tokens |
| Output price | $15.00 / 1M tokens | $15.00 / 1M tokens |
| Knowledge cutoff | — | 2025-01 |
| Input types | text, image, file, audio | text, image, file |
| Output types | text | text |
| Plan | Premium | Premium |
Which should you use?
Pick Claude Sonnet 4.5 when…
- You need the larger context window — 1M against 256K.
- You want longer single responses — up to 64K output tokens.
Related comparisons
Try both on Clade
You do not have to choose. One Clade subscription gives you Grok 4, Claude Sonnet 4.5, and every other model on the platform.