Claude 3.5 Sonnet vs Grok 4.1 Fast
Compare Anthropic and xAI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Claude 3.5 Sonnet
Grok 4.1 Fast
Cost Differences
Grok 4.1 Fast costs less than Claude 3.5 Sonnet
Feature Comparison
| Feature | Claude 3.5 Sonnet | Grok 4.1 Fast |
|---|---|---|
| Provider | Anthropic | xAI |
| Input Price | $3.00/1M tokens | $0.20/1M tokens |
| Output Price | $15.00/1M tokens | $0.50/1M tokens |
| Context Window | 200,000 tokens | 2,000,000 tokens |
| Max Output | 8,192 tokens | 131,072 tokens |
| Category | balanced | efficient |
| Capabilities | textvisioncode | textreasoningcode |
| Release Date | 10/22/2024 | 1/15/2026 |
Claude 3.5 Sonnet vs Grok 4.1 Fast: Which Should You Choose?
Choosing between Claude 3.5 Sonnet and Grok 4.1 Fast depends on your priorities: cost efficiency, context length, or raw capability. Grok 4.1 Fast is the more affordable option at $0.20/1M input tokens — 93% cheaper than Claude 3.5 Sonnet. Meanwhile, Grok 4.1 Fast offers a significantly larger context window at 2,000,000 tokens vs 200,000 for Claude 3.5 Sonnet.
These models come from different providers — Anthropic and xAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to xAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: Claude 3.5 Sonnet is a balanced model while Grok 4.1 Fast is efficient. This means they're optimized for different workloads. Grok 4.1 Fast targets more demanding workloads, while Claude 3.5 Sonnet provides a cost-effective option for everyday tasks.
Output costs matter too. Claude 3.5 Sonnet charges $15.00/1M output tokens vs $0.50 for Grok 4.1 Fast. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok 4.1 Fast has the edge here at $0.50/1M output tokens.
Multimodal capabilities: Claude 3.5 Sonnet supports vision (image inputs) while Grok 4.1 Fast is text-only. If your application needs image understanding, this narrows your choice.
Best Use Cases
Choose Claude 3.5 Sonnet when:
- • You're already using Anthropic's API ecosystem
Choose Grok 4.1 Fast when:
- • Budget is a primary concern
- • You need a larger context window (2,000,000 tokens)
- • You need longer outputs (up to 131,072 tokens)
- • You're already using xAI's API ecosystem
- • You're running high-volume, latency-sensitive workloads
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Claude 3.5 Sonnet (Anthropic)
Grok 4.1 Fast (xAI)
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