xAI's newest flagship model with industry-leading speed and agentic tool calling.
Google's most intelligent Flash model, with significant gains over 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Grok 4.20 and Gemini 3.8 Flash are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.
Gemini 3.8 Flash has a lower blended cost. Grok 4.20: $1.25 input / $2.50 output. Gemini 3.8 Flash: $0.75 input / $3.75 output.
Grok 4.20 has a larger context window: Grok 4.20 supports 2M tokens vs Gemini 3.8 Flash at 1M tokens.
Yes, both Grok 4.20 and Gemini 3.8 Flash support vision/image input.
Grok 4.20 and Gemini 3.8 Flash have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.
If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Grok 4.20 and Gemini 3.8 Flash for free on idapt.app to see which performs better for your specific needs.