Claude (Anthropic) — Opus 4.6 / Sonnet 4.6

Claude Opus 4 excels at complex, long-running tasks and agent workflows, with particular strengths in coding and advanced reasoning. Claude is also widely regarded as the strongest for nuanced writing, safety-conscious outputs, and extended reasoning.

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GPT-5 (OpenAI) — GPT-5.4

GPT-5.4 earns its position through ecosystem breadth and terminal/tool-use strength. GPT-5.2 features a significantly expanded context window of 400K tokens and achieves a perfect 100% score on the AIME 2025 math benchmark. 

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Gemini 3.1 Pro (Google)

Gemini 3.1 Pro handles coding, analysis, writing, and document reasoning without needing to switch models, and is a natural fit for Google Workspace. It's broadly considered the best balance of quality and cost among frontier models.