What happened
xAI's new Grok 4.5 model demonstrated strong performance in an app build-off conducted by tryai.dev against OpenAI's GPT-5.5 and Anthropic's Claude Opus 4.8 and Fable 5. Grok 4.5 successfully generated interactive applications like a Breakout game and a particle gravity sandbox. The model achieved 110 tokens/second throughput and a 0.002¢ per reply cost, streaming at roughly twice the speed and half the cost of competitors, despite requiring a retry on a complex 3D Rubik's Cube task.
Why it matters
High-volume coding and agentic workloads now have a significantly more cost-effective option with xAI's Grok 4.5. Platform engineers and CTOs evaluating model deployment can reduce inference costs by 50% and double throughput compared to leading alternatives, shifting unit economics for code generation and automated task execution. This follows recent reports of GPT-5.5 showing reasoning limits, suggesting a diversifying landscape for model capabilities and performance.
