GPT-4.1 nano vs Grok 4.1 Fast
Compare OpenAI and xAI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-4.1 nano
Grok 4.1 Fast
Cost Differences
Grok 4.1 Fast costs more than GPT-4.1 nano
Feature Comparison
| Feature | GPT-4.1 nano | Grok 4.1 Fast |
|---|---|---|
| Provider | OpenAI | xAI |
| Input Price | $0.10/1M tokens | $0.20/1M tokens |
| Output Price | $0.40/1M tokens | $0.50/1M tokens |
| Context Window | 128,000 tokens | 2,000,000 tokens |
| Max Output | 8,192 tokens | 131,072 tokens |
| Category | efficient | efficient |
| Capabilities | text | textreasoningcode |
| Release Date | 4/14/2025 | 1/15/2026 |
GPT-4.1 nano vs Grok 4.1 Fast: Which Should You Choose?
Choosing between GPT-4.1 nano and Grok 4.1 Fast depends on your priorities: cost efficiency, context length, or raw capability. GPT-4.1 nano is the more affordable option at $0.10/1M input tokens — 50% cheaper than Grok 4.1 Fast. Meanwhile, Grok 4.1 Fast offers a significantly larger context window at 2,000,000 tokens vs 128,000 for GPT-4.1 nano.
These models come from different providers — OpenAI and xAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with OpenAI, switching to xAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
Both models are in the efficient category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: GPT-4.1 nano would save you roughly $45.00/month compared to Grok 4.1 Fast. For startups and indie developers, that difference can be significant.
Output costs matter too. GPT-4.1 nano charges $0.40/1M 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. GPT-4.1 nano has the edge here at $0.40/1M output tokens.
Best Use Cases
Choose GPT-4.1 nano when:
- • Budget is a primary concern
- • You're already using OpenAI's API ecosystem
- • You're running high-volume, latency-sensitive workloads
Choose Grok 4.1 Fast when:
- • You need a larger context window (2,000,000 tokens)
- • You need more capabilities (reasoning, code)
- • 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
GPT-4.1 nano (OpenAI)
Grok 4.1 Fast (xAI)
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