LLM Comparison
Claude Sonnet 4.6 vs Grok 4 Fast
Side-by-side specs, pricing & capabilities · Updated April 2026
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2/6 modelsSame tier:
 Claude Sonnet 4.6 | ||
|---|---|---|
| Organization |  Anthropic | |
| OpenTools Score | 67 7.5 | |
| Family | Claude | Grok |
| Status | Current | Current |
| Release Date | Feb 2026 | Sep 2025 |
| Context Window | 1.0M tokens | 2.0M tokens |
| Input Price | $3.00/M tokens | $0.20/M tokens |
| Output Price | $15.00/M tokens | $0.50/M tokens |
| Pricing Notes | Cache read: $0.3000/M tokens | Cache read: $0.0500/M tokens |
| Capabilities | textvisioncodetool-use | textvisioncode |
| Max Output | 128K tokens | 30K tokens |
| API Identifier | anthropic/claude-sonnet-4.6 | x-ai/grok-4-fast |
| Benchmarks | ||
| MMLU | 88 | — |
| HumanEval | 93.7 | — |
| MATH | 79.5 | — |
| GPQA | 68.9 | — |
| View Claude Sonnet 4.6 | View Grok 4 Fast | |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Grok 4 FastCheapest | $0.20 | $0.25 | $0.45 | — |
| Claude Sonnet 4.6 | $3.00 | $7.50 | $10.50 | +2233% |
Anthropic
Claude Sonnet 4.6
Claude Sonnet 4.6 is a multimodal llm from Anthropic. Supports up to 1,000,000 token context window. Achieves 88.0% on MMLU. Available from $3.00/M input tokens.
xAI
Grok 4 Fast
Grok 4 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.
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