xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
Fast workhorse model with built-in thinking and audio support.
No shared demos for these models yet.
No captured outputs for these models yet.
Based on the Capability Index, Grok 4.5 scores higher (88.5 vs 72.9). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Gemini 2.5 Flash has a lower blended cost. Grok 4.5: $2.00 input / $6.00 output. Gemini 2.5 Flash: $0.30 input / $2.50 output.
Gemini 2.5 Flash has a larger context window: Grok 4.5 supports 500K tokens vs Gemini 2.5 Flash at 1M tokens.
Yes, both Grok 4.5 and Gemini 2.5 Flash support vision/image input.
Key differences: Grok 4.5 has a notably higher capability index (15.6 point gap); Gemini 2.5 Flash is significantly cheaper. Compare full specs on this page.
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 4.5 and Gemini 2.5 Flash for free on idapt.app to see which performs better for your specific needs.