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Claude Sonnet 4.5 vs Grok 4
A detailed comparison of Claude Sonnet 4.5 (Anthropic) and Grok 4 (xAI) across pricing, performance, and features.
Pricing Comparison
| Metric | Claude Sonnet 4.5 | Grok 4 | Difference |
|---|---|---|---|
| Input / 1M tokens | $3.00 | $3.00 | — |
| Output / 1M tokens | $15.00 | $15.00 | — |
| Context window | 200K | 128K | — |
| Max output | 16K | 16.384K | — |
Benchmark Comparison
| Benchmark | Claude Sonnet 4.5 | Grok 4 |
|---|---|---|
| MMLU-Pro | 84.5% | 86% |
| HumanEval | 93% | 93% |
| GPQA | 68.2% | 72% |
Capabilities
| Capability | Claude Sonnet 4.5 | Grok 4 |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
| web-search | ✗ | ✓ |
Claude Sonnet 4.5 Strengths
- ✓Well-tested and stable
- ✓Strong coding and analysis
Claude Sonnet 4.5 Weaknesses
- ✗Superseded by Sonnet 4.6
- ✗Same price as the newer model
Grok 4 Strengths
- ✓Built-in web search and real-time data
- ✓Strong reasoning
- ✓$25 free credits for new users
Grok 4 Weaknesses
- ✗Premium pricing for its benchmark tier
- ✗Additional charges for tool invocations ($2.50-$5/1K calls)
- ✗Smaller ecosystem than OpenAI/Anthropic
Quick Verdict
Best value: Grok 4 is the more affordable option at $3/$15 per 1M tokens.
Higher benchmarks: Grok 4 scores higher on average across available benchmarks (83.7% avg).
Larger context: Claude Sonnet 4.5 supports 200K tokens.
Choose Grok 4 if cost matters most. Choose Claude Sonnet 4.5 if you need the best possible quality for complex tasks.