Claude Sonnet 4.5 vs Grok-4
Both have similar output pricing, while Claude Sonnet 4.5 offers a larger context window. Choose Claude Sonnet 4.5 or Grok-4 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 4.5 | Grok-4 |
|---|---|---|
| Provider | Anthropic | Poe |
| Input / 1M tokens | $3.00 | $3.00 |
| Output / 1M tokens | $15.00 | $15.00 |
| Context window | 1M | 256K |
| Parameters | — | 3T |
| Open weights | No | No |
| Released | Sep 2025 | Jul 2025 |
| LiveBench score | 67.9 | — |
| SWE-bench Verified score | 74.8 | — |
| LMArena (Chatbot Arena) Elo score | 1438 | 1411 |
| FrontierMath score | 15.2 | 19.7 |
| LMArena WebDev Elo score | 1394 | — |
| Epoch Capabilities Index score | 147 | 146 |
| SWE-bench Multilingual score | 67.0 | — |
| GPQA Diamond score | 82.3 | 87.0 |
| Aider Polyglot score | — | 79.6 |
| LMArena Vision Elo score | — | 1210 |
FAQ
Is Claude Sonnet 4.5 or Grok-4 cheaper?
Claude Sonnet 4.5 and Grok-4 have comparable output pricing.
Which has the larger context window, Claude Sonnet 4.5 or Grok-4?
Claude Sonnet 4.5 has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.