Grok 4.1 Fast vs DeepSeek V3.2
xAI's Grok 4.1 Fast against DeepSeek's DeepSeek V3.2 — pricing, benchmarks, context, and best use cases compared side by side.
Grok 4.1 Fast leads on quality (Elo 1355 vs 1320), while DeepSeek V3.2 compensates with 0% lower pricing. Grok 4.1 Fast offers a larger context window (2M vs 128K).
| Input Price | $0.20/1M | $0.28/1M |
| Output Price | $0.50/1M | $0.42/1M |
| Blended Price | $0.35/1M | $0.35/1M |
| LMSYS Elo | 1355 | 1320 |
| Context Window | 2,000,000 | 128,000 |
| Provider | xAI | DeepSeek |
Pricing breakdown
When comparing LLM API pricing, Grok 4.1 Fast charges $0.20 per 1M input tokens compared to DeepSeek V3.2's $0.28 — a 29% difference. For output tokens, DeepSeek V3.2 costs $0.42/1M versus $0.50/1M for Grok 4.1 Fast. On a blended basis (averaging input and output), Grok 4.1 Fast comes in at $0.35/1M tokens versus $0.35/1M for DeepSeek V3.2.
Quality & benchmarks
On the LMSYS Chatbot Arena leaderboard — a crowd-sourced benchmark based on blind human preference voting — Grok 4.1 Fast scores 1355 Elo compared to DeepSeek V3.2's 1320, a 35-point advantage. While Grok 4.1 Fast has the edge, both models are competitive. Grok 4.1 Fast excels at massive context processing, budget real-time apps, and high-throughput tasks, while DeepSeek V3.2 is well-suited for budget general-purpose tasks, self-hosting, and cost-sensitive deployments.
Context window comparison
Grok 4.1 Fast provides a significantly larger context window at 2M tokens compared to DeepSeek V3.2's 128K tokens — 15.6x more capacity for processing long documents, large codebases, or extended conversations. With 2M tokens, Grok 4.1 Fast can handle entire books, repositories, or multi-document analysis in a single prompt.
Monthly cost estimate
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