GPT-5.4 vs Grok 4.1 Fast
Pricing, context window, and benchmark comparison · Last updated April 2026
Grok 4.1 Fast is cheaper than GPT-5.4 at $0.20/1M/1M vs $2.50/1M/1M input tokens — a 12.5x cost difference. GPT-5.4 scores higher on quality benchmarks (ELO 1420). Choose Grok 4.1 Fast for cost-sensitive workloads; choose GPT-5.4 for maximum quality.
Which is cheaper: GPT-5.4 or Grok 4.1 Fast?
Grok 4.1 Fast is the cheaper option at $0.20/1M per 1M input tokens, compared to $2.50/1M for GPT-5.4. That is a 12.5x cost difference on input tokens. Output pricing follows a similar pattern: GPT-5.4 charges $15.00/1M/1M vs $0.50/1M/1M for Grok 4.1 Fast.
Which has better quality: GPT-5.4 or Grok 4.1 Fast?
Based on LMSYS Chatbot Arena rankings, GPT-5.4 achieves a higher ELO score (1420 vs 1305), suggesting stronger performance on open-ended tasks. GPT-5.4 excels at openai flagship — top-tier reasoning, coding, and multimodal. Grok 4.1 Fast is known for 2m token context at $0.20/$0.50 per 1m — unbeatable for long context.
Which should you choose: GPT-5.4 or Grok 4.1 Fast?
- → OpenAI flagship — top-tier reasoning, coding, and multimodal
- → Native computer use and tool search
- → 272K standard context (expandable to 1M)
- → 2M token context at $0.20/$0.50 per 1M — unbeatable for long context
- → Very fast inference
- → Real-time X data access
Frequently Asked Questions
Which is cheaper: GPT-5.4 or Grok 4.1 Fast?
Grok 4.1 Fast is cheaper at $0.20/1M per 1M input tokens, making it 12.5x more affordable.
Which has better quality: GPT-5.4 or Grok 4.1 Fast?
GPT-5.4 scores higher on the LMSYS Chatbot Arena with an ELO of 1420, suggesting better overall quality for most tasks.
Which has a larger context window: GPT-5.4 or Grok 4.1 Fast?
Grok 4.1 Fast has a larger context window at 2000K tokens.
Should I choose GPT-5.4 or Grok 4.1 Fast?
Choose Grok 4.1 Fast if cost is the priority. Choose GPT-5.4 if benchmark quality is most important. Consider your specific use case: GPT-5.4 is best for coding and reasoning, while Grok 4.1 Fast excels at long-context and low-cost.
Is GPT-5.4 or Grok 4.1 Fast open source?
GPT-5.4 is proprietary. Grok 4.1 Fast is proprietary.