Side-by-side comparison
Grok 4 vs Claude Sonnet 4.5
Anthropic
Claude Sonnet 4.5
👁 Vision
🔧 Tools
{} JSON
Input / 1M
$3.0000
Output / 1M
$15.0000
| Grok 4 | Claude Sonnet 4.5 | |
|---|---|---|
| Provider | xAI | Anthropic |
| Context window Maximum tokens (input + output) the model can process in a single request. Glossary → | 256,000 | 1,000,000 |
| Capabilities Optional capabilities the model advertises: vision (images), tools (function calling), json_mode (structured output). | vision, tools, json_mode | vision, tools, json_mode |
| Input $ / 1M tokens Cost for tokens you send (prompt + context). Cheaper side highlighted. Glossary → | 3.0000 | 3.0000 |
| Output $ / 1M tokens Cost for tokens the model generates. Output is normally 3–5× pricier than input. Glossary → | 15.0000 | 15.0000 |
Frequently asked questions
Which is cheaper, Grok 4 or Claude Sonnet 4.5?
Grok 4 is cheaper than Claude Sonnet 4.5 on a 50/50 input/output blend by about $0 per 1M tokens. Exact savings depend on your input-vs-output ratio — use the cost calculator on this page for a workload-specific estimate.
Which has a larger context window, Grok 4 or Claude Sonnet 4.5?
Claude Sonnet 4.5 has the larger context window at 1M tokens versus 256k tokens for Grok 4. That means Claude Sonnet 4.5 can ingest about 3.9x as much text per request.
What is the difference between Grok 4 and Claude Sonnet 4.5?
Grok 4 comes from xAI; Claude Sonnet 4.5 comes from Anthropic. They differ in pricing, context window, and supported capabilities — see the side-by-side table on this page for the exact figures, refreshed nightly.