xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
OpenAI's balanced GPT-5.6 tier — GPT-5.5-class quality for everyday work at half the price.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Grok 4.5 and GPT 5.6 Terra 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 5.6 Terra: $2.50 input / $15.00 output.
GPT 5.6 Terra has a larger context window: Grok 4.5 supports 500K tokens vs GPT 5.6 Terra at 1.1M tokens.
Yes, both Grok 4.5 and GPT 5.6 Terra support vision/image input.
Grok 4.5 and GPT 5.6 Terra 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 4.5 and GPT 5.6 Terra for free on idapt.app to see which performs better for your specific needs.