Grok 4.1 Fast offers a 2M token context window at $0.20/$0.50 per 1M tokens — the cheapest massive-context option on the market. It is ideal for long-document analysis, massive codebases, and high-throughput workloads that need huge context.
Pricing Breakdown
| Volume | Input Cost | Output Cost | Combined (50/50) |
|---|---|---|---|
| 1,000 tokens | $0.0002 | $0.0005 | $0.0003 |
| 10,000 tokens | $0.0020 | $0.0050 | $0.0035 |
| 100,000 tokens | $0.0200 | $0.0500 | $0.0350 |
| 1,000,000 tokens | $0.2000 | $0.5000 | $0.3500 |
Strengths
- ✓2M token context at $0.20/$0.50 per 1M — unbeatable for long context
- ✓Very fast inference
- ✓Real-time X data access
- ✓Reasoning and non-reasoning variants
Weaknesses
- ✗Weaker on hardest tasks vs. Grok 4.20
- ✗Ecosystem still smaller than OpenAI
Compare Grok 4.1 Fast With
Frequently Asked Questions
How much does Grok 4.1 Fast cost?
Grok 4.1 Fast costs $0.20/1M per 1M input tokens and $0.50/1M per 1M output tokens.
What is Grok 4.1 Fast's context window?
Grok 4.1 Fast has a context window of 2M tokens, which means it can process up to 2,000,000 tokens in a single request.
Is Grok 4.1 Fast open source?
No, Grok 4.1 Fast is a proprietary model by xAI and is not open source.
What is Grok 4.1 Fast best used for?
Grok 4.1 Fast is best suited for: long-context, low-cost, fast-response, summarization, research. 2M token context at $0.20/$0.50 per 1M — unbeatable for long context.
What is Grok 4.1 Fast's ELO score?
Grok 4.1 Fast has an ELO score of 1305 on the LMSYS Chatbot Arena leaderboard, placing it among top-tier models.