OpenAI’s release of GPT-5.5 has set up an immediate comparison with Anthropic’s Claude Opus 4.7, with benchmark data and platform rankings suggesting that while GPT-5.5 leads on most measured tests, Claude Opus 4.7 may retain an advantage in advanced and agentic coding tasks.
Benchmark Scores Show Split Picture
GPT-5.5 was released on April 23, a week after Anthropic introduced Claude Opus 4.7. The comparison presented there concludes that Claude Opus 4.7 has an edge in advanced and agentic coding, while GPT-5.5 performs better across most benchmarks.
GPT-5.5 is not yet ranked on all AI leaderboards, though it is expected to be highly competitive with Claude Opus 4.7. On verified benchmark tests such as Arc Prize, GPT-5.5 is said to outperform Opus 4.7. At the same time, the popular Arena leaderboard, which is based on user testing, places Claude Opus 4.7 Thinking in the top overall spot. The same material notes that Anthropic’s unreleased Claude Mythos is not yet ranked and is described by the company as performing even better than Opus 4.7.
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Performance Tests Favour GPT-5.5 Overall
The reports rely primarily on self-reported scores from OpenAI and Anthropic for standard benchmark comparisons. In those figures, GPT-5.5 is shown ahead in most categories, including Terminal-Bench 2.0, Humanity’s Last Exam, BrowseComp, ARC-AGI-1 and ARC-AGI-2. Claude Opus 4.7 is shown ahead on SWE-Bench Pro, Humanity’s Last Exam with tools, and GPQA Diamond.
Both models post strong results, but presents GPT-5.5 as having the broader benchmark advantage. It also notes that GPT-5.4 Pro currently holds the top score on the Epoch Capabilities Index leaderboard, ahead of Gemini 3.1 Pro and GPT-5.4.
Pricing, Access and Features Define the Trade-Off
Both models are available only to paying subscribers. GPT-5.5 is available to OpenAI Plus, Pro, Business and Enterprise users in ChatGPT and Codex, while Claude Opus 4.7 is available to Anthropic Pro and Max customers. In the API, GPT-5.5 pricing is listed at $5 per one million input tokens and $30 per one million output tokens, while Opus 4.7 is listed at $5 per million input tokens and $25 per million output tokens.
GPT-5.5 offers noticeable improvements in agentic coding, computer use, knowledge work and early scientific research, while Anthropic says Claude Opus 4.7 improves advanced coding, visual intelligence and document analysis. It concludes that the two systems offer broadly similar overall feature sets for research, coding, creative projects and professional work, but suggests GPT-5.5 has the edge for everyday professional use because of ChatGPT’s wider overall toolset, while Claude Opus 4.7 may be the stronger option for advanced and agentic coding.
About the author – Rehan Khan is a law student and legal journalist with a keen interest in cybercrime, digital fraud, and emerging technology laws. He writes on the intersection of law, cybersecurity, and online safety, focusing on developments that impact individuals and institutions in India.
