GPT-5.4 Mini vs Claude Opus 5.5

OpenAI's more affordable mid-tier model, built to balance capability and cost at scale. GPT-5.4 Mini handles chat, coding assistants, and agent workflows with reliable instruction following and solid multi-step reasoning. It reads text and images across a large context window, and supports web search and function calling. A practical production choice when you want current GPT quality without the flagship price.

Anthropic's newest flagship, and the first in its Claude 5.5 family. Anthropic positions Opus 5.5 to perform at the level of its most capable model on most work, while costing meaningfully less to run than the previous Opus. It reads text and images, holds a very large context, and reasons before every answer with adjustable effort. Anthropic calls it their daily driver for serious coding, computer use, and knowledge work, with its knowledge current to mid-2026.