LLM Comparison
Grok 4 Fast vs Claude Sonnet 4.6
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 | 47 5.2 | |
| Family | Grok | Claude |
| Status | Current | Current |
| Release Date | Sep 2025 | Feb 2026 |
| Context Window | 2.0M tokens | 1.0M tokens |
| Input Price | $0.20/M tokens | $3.00/M tokens |
| Output Price | $0.50/M tokens | $15.00/M tokens |
| Pricing Notes | Cache read: $0.0500/M tokens | Cache read: $0.3000/M tokens |
| Capabilities | textvisioncode | textvisioncodetool-use |
| Max Output | 30K tokens | 128K tokens |
| API Identifier | x-ai/grok-4-fast | anthropic/claude-sonnet-4.6 |
| Benchmarks | ||
| MMLU | — | 86.7anthropic |
| GPQA Diamond | — | 42.7anthropic |
| SWE-bench Verified | — | 37.2anthropic |
| Terminal-Bench 2.0 | — | 51anthropic |
| MATH 500 | — | 54.2anthropic |
| LiveCodeBench | — | 41.5anthropic |
| Berkeley Function Calling | — | 88.3anthropic |
| HLE | — | 27.5anthropic |
| GPQA-AA Elo | — | 144.6anthropic |
| View Grok 4 Fast | View Claude Sonnet 4.6 | |
Cost Calculator
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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% |
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.
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.
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