OpenAI’s GPT-5.5 vs Claude Opus 4.7: Which is better?

OpenAI released GPT-5.5 just a week after Anthropic’s Claude Opus 4.7, intensifying the race between flagship AI models.

Early benchmark and leaderboard results suggest GPT-5.5 leads overall, but Opus 4.7 still has strengths in some advanced coding and agentic tasks.

The comparison matters for enterprises and developers evaluating model quality, coding performance, pricing, and API access.

The latest results from arenas like Arc Prize, the Arena leaderboard, and Epoch Capabilities Index will likely shape adoption decisions.