Claude Opus 4.5 and Gemini 3 Pro are the latest flagship AI models from Anthropic and Google, both launched in November 2025. These models represent major advances in AI capabilities, with each excelling in different areas.
Performance Comparison
Claude Opus 4.5 demonstrates superior coding performance, achieving 80.9% accuracy on SWE-bench Verified compared to Gemini 3 Pro's 76.2%. On Terminal-bench 2.0, Opus 4.5 scored 59.3% versus Gemini 3 Pro's 54.2%. Notably, Opus 4.5 scored higher on Anthropic's performance engineering hiring exam than any human candidate within the two-hour time limit.
Gemini 3 Pro excels at multimodal understanding and academic reasoning, achieving 37.5% on Humanity's Last Exam and 91.9% on GPQA Diamond. The model features a massive 1-million-token context window compared to Opus 4.5's 200K, enabling it to process vast amounts of multimodal inputs including text, images, audio, and video simultaneously.
Key Features
Claude Opus 4.5 introduces a unique effort parameter that allows users to adjust response thoroughness, latency, and token consumption on a per-call basis. It features enhanced computer use capabilities with a new zoom action for detailed screen inspection. The model maintains reasoning continuity by automatically preserving all previous thinking blocks throughout conversations.
Gemini 3 Pro is built as a multimodal AI from the ground up, with advanced agentic abilities that allow it to act as an autonomous agent planning and executing tasks. It integrates seamlessly across Google's ecosystem, providing immediate availability to over 2 billion users through Google Search and Workspace.
Pricing
Claude Opus 4.5 costs $5 per million input tokens and $25 per million output tokens, representing a 67% price reduction from its predecessor Opus 4.1. Gemini 3 Pro offers more aggressive pricing at $2/$12 for standard usage, or $4/$18 for contexts exceeding 200K tokens, making it the most cost-effective frontier model.