Grok 4.20 vs o4-mini
Pricing, context window, and benchmark comparison · Last updated April 2026
o4-mini is cheaper than Grok 4.20 at $1.10/1M/1M vs $2.00/1M/1M input tokens — a 1.8x cost difference. Grok 4.20 scores higher on quality benchmarks (ELO 1380). Choose o4-mini for cost-sensitive workloads; choose Grok 4.20 for maximum quality.
Which is cheaper: Grok 4.20 or o4-mini?
o4-mini is the cheaper option at $1.10/1M per 1M input tokens, compared to $2.00/1M for Grok 4.20. That is a 1.8x cost difference on input tokens. Output pricing follows a similar pattern: Grok 4.20 charges $6.00/1M/1M vs $4.40/1M/1M for o4-mini.
Which has better quality: Grok 4.20 or o4-mini?
Based on LMSYS Chatbot Arena rankings, Grok 4.20 achieves a higher ELO score (1380 vs 1350), suggesting stronger performance on open-ended tasks. Grok 4.20 excels at 2m token context window — tied for largest available. o4-mini is known for cheapest reasoning model in the openai lineup.
Which should you choose: Grok 4.20 or o4-mini?
- → 2M token context window — tied for largest available
- → Real-time X (Twitter) data access
- → Strong reasoning and multi-agent variants
- → Cheapest reasoning model in the OpenAI lineup
- → Strong performance on code and math for the price
- → 200K context window
Frequently Asked Questions
Which is cheaper: Grok 4.20 or o4-mini?
o4-mini is cheaper at $1.10/1M per 1M input tokens, making it 1.8x more affordable.
Which has better quality: Grok 4.20 or o4-mini?
Grok 4.20 scores higher on the LMSYS Chatbot Arena with an ELO of 1380, suggesting better overall quality for most tasks.
Which has a larger context window: Grok 4.20 or o4-mini?
Grok 4.20 has a larger context window at 2000K tokens.
Should I choose Grok 4.20 or o4-mini?
Choose o4-mini if cost is the priority. Choose Grok 4.20 if benchmark quality is most important. Consider your specific use case: Grok 4.20 is best for reasoning and research, while o4-mini excels at reasoning and coding.
Is Grok 4.20 or o4-mini open source?
Grok 4.20 is proprietary. o4-mini is proprietary.