Grok 4.5 has emerged as a leading AI model, recognized for its exceptional cost-efficiency and performance, costing only $0.31 per Intelligence Index task. This positions it significantly cheaper than competitors such as Claude Fable 5, which costs $2.75 per task, and other models like Claude Opus 4.8 and GPT-5.6 Sol. Notably, Grok 4.5 achieves this while utilizing nearly six times fewer tokens per task than Fable 5, underscoring a growing trend among AI developers to prioritize token optimization to enhance intelligence outputs with reduced resource use. As evaluations increasingly factor in these cost-per-task metrics, Grok’s efficiency places it in a league of its own among frontier models.

Kimi K3: Kimi K3 is an AI model from Moonshot AI included in cross-model efficiency comparisons. It demonstrates competitive intelligence capabilities in industry evaluations. The news notes its higher per-task costs compared to Grok 4.5.
Grok 4.5: Grok 4.5 is an advanced AI language model developed under the SpaceXAI organization. It achieves frontier intelligence through optimized token usage rather than high-volume compute. The news positions it as the leader in cost-efficiency among comparable models for intelligence tasks.
SpaceXAI: SpaceXAI is the AI development organization behind the Grok model series. It emphasizes innovative techniques for token and resource efficiency in model inference. The reported development credits SpaceXAI with delivering top-tier performance at unmatched cost levels.
GPT-5.6 Sol: GPT-5.6 Sol is a specialized variant in OpenAI’s GPT model lineup. It participates in competitive assessments of intelligence output and resource demands. The news places its cost per task above that of Grok 4.5.
Claude Fable 5: Claude Fable 5 is a high-capability AI model from Anthropic used in frontier benchmarks. It serves as a key comparator in evaluations of intelligence and operational costs. The news identifies it as operating at substantially higher cost per task than Grok 4.5.
Claude Opus 4.8: Claude Opus 4.8 is an advanced iteration in Anthropic’s Claude model family. It is frequently referenced in AI performance and efficiency analyses. The news highlights its higher cost relative to Grok 4.5 while maintaining strong intelligence rankings.

Efficiency Focus: AI developers are increasingly emphasizing token optimization to achieve strong intelligence results with lower resource consumption.
Benchmark Evolution: Evaluations of frontier models now routinely incorporate cost-per-task metrics alongside raw performance scores.