Quick Take

This comparison highlights the divide between a specialized, high-performance reasoning engine and an accessible, lightweight model. Claude Opus 4.5 (released November 2025) establishes itself as a powerhouse with high intelligence and coding indices. Gemma 4 12B (released June 2026) serves as a non-reasoning, zero-cost model designed for efficiency and broad accessibility.

Benchmark Read

Claude Opus 4.5 significantly outperforms Gemma 4 12B across all shared metrics.

• Intelligence & Coding: Claude Opus 4.5 leads with an Intelligence index of 49.7 and a Coding index of 47.8, compared to Gemma 4 12B’s 19.5 and 17.5, respectively.
• Reasoning & Math: Claude Opus 4.5 excels in complex tasks, achieving a 91.3 Math index and an AIME 2025 score of 0.913.
• Standardized Benchmarks: Claude Opus 4.5 scores 0.866 on GPQA and 0.895 on MMLU Pro, while Gemma 4 12B records 0.661 on GPQA. In technical benchmarks like TerminalBench Hard, Claude Opus 4.5 scores 0.469 compared to Gemma 4 12B’s 0.113.

Cost and Speed

The pricing models represent opposite ends of the spectrum. Gemma 4 12B is entirely free, with input and output costs at $0.00/1M tokens. Claude Opus 4.5 operates on a premium tier, with a blended cost of $10.94/1M tokens ($6.25 input / $25.00 output).

Regarding performance, Claude Opus 4.5 delivers an output speed of 53.747 tok/s with a time to first token of 11.337s. Specific speed metrics for Gemma 4 12B are currently unknown, though Google has introduced Multi-Token Prediction (MTP) drafters for the Gemma 4 family to improve inference speed.

Best Fit

Claude Opus 4.5 is best suited for enterprise-grade automation, complex mathematical modeling, and high-stakes coding projects. Gemma 4 12B is ideal for developers seeking a zero-cost model for prototyping or those integrated into the Google Colab environment.