Inception's latest diffusion LLM and the fastest reasoning model available, producing and refining tokens in parallel instead of one at a time.
Fast agentic model with 2M context window and tool calling.
No shared demos for these models yet.
No captured outputs for these models yet.
This model hasn't been benchmarked yet.
Both Mercury 2.5 and Grok 4.1 Fast 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.
Grok 4.1 Fast has a larger context window: Mercury 2.5 supports 260K tokens vs Grok 4.1 Fast at 2M tokens.
Grok 4.1 Fast supports vision/image input, but Mercury 2.5 does not.
Key differences: only Grok 4.1 Fast supports vision input; only Mercury 2.5 offers extended reasoning mode. 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 Mercury 2.5 and Grok 4.1 Fast for free on idapt.app to see which performs better for your specific needs.