xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
GPT 3.5 Turbo with extended 16K context window.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Grok 4.5 and GPT 3.5 Turbo 16K 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 4.5 has a lower blended cost. Grok 4.5: $2.00 input / $6.00 output. GPT 3.5 Turbo 16K: $3.00 input / $4.00 output.
Grok 4.5 has a larger context window: Grok 4.5 supports 500K tokens vs GPT 3.5 Turbo 16K at 16K tokens.
Grok 4.5 supports vision/image input, but GPT 3.5 Turbo 16K does not.
Key differences: only Grok 4.5 supports vision input; only Grok 4.5 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 Grok 4.5 and GPT 3.5 Turbo 16K for free on idapt.app to see which performs better for your specific needs.