Claude Opus 5.5 vs. GPT-6 Astra, Gemini 3.8, Grok 4.7 and Chinese LLMs. Is Anthropic returning to the top?

Claude Opus 5.5 is Anthropic's latest model designed primarily for agentic programming, long tasks, tool use, and professional knowledge work.

In initial independent tests, it ranked at the absolute top of the world, taking first place in Arena Code WebDev.

At the same time, it costs significantly less than Claude Fable 5.1 and GPT-6 Astra.

Has Anthropic created the best AI model currently available, or just another leader in one of the increasingly balanced races?

In this analysis, we separate manufacturer data from independent benchmark results and our own conclusions.

This is important because, in 2026, a single table published by a model's manufacturer says less and less about how the system will perform in real-world work.

How do we label sources?

MANUFACTURER Official documentation from Anthropic, OpenAI, Google, SpaceXAI, DeepSeek, Alibaba, or Moonshot.