OpenAI GPT-5.5 vs Claude Opus 4.7: Full Comparison
▼ Summary
– OpenAI released GPT-5.5 on April 23, a week after Anthropic released Claude Opus 4.7.
– GPT-5.5 outperforms Opus 4.7 on most benchmarks, such as Terminal-Bench 2.0 (82.7% vs 69.4%) and ARC-AGI-2 (83.3% vs 68.3%).
– Claude Opus 4.7 leads in advanced and agentic coding, scoring higher on SWE-Bench Pro (64.3% vs 58.6%).
– Both models are available only to paid subscribers; GPT-5.5 API pricing starts at $5 per 1M input tokens and $30 per 1M output tokens, while Opus 4.7 costs $5 and $25, respectively.
– GPT-5.5 has a broader feature set for everyday work due to ChatGPT’s tools, including image generation, while Opus 4.7 excels in agentic coding.
The latest chapter in the AI arms race unfolded last week. OpenAI launched GPT-5.5 on April 23, arriving just a week after Anthropic dropped Claude Opus 4.7. With the two titans of tech trading blows so closely together, we put both models under the microscope.
Here is the short version: Claude Opus 4.7 appears to take the crown for advanced and agentic coding tasks, but GPT-5.5 pulls ahead on the vast majority of standard benchmark tests.
Benchmark Battle: Who Wins on Paper?
GPT-5.5 hasn’t appeared on every leaderboard yet, but early data suggests it will be a fierce competitor. On the verified Arc Prize benchmarks, GPT-5.5 outperforms Opus 4.7.
Looking at the Arena leaderboard (which relies on user preference), Claude Opus 4.7 Thinking currently sits at number one. Interestingly, Opus 4.6 is actually ranked higher than its successor for now, though that is expected to shift. Anthropic dominates the top four spots overall, and the company claims its unreleased Claude Mythos model is even more capable than Opus 4.7.
On the Epoch Capabilities Index (ECI) leaderboard, which aggregates multiple benchmarks, GPT-5.4 Pro currently holds the highest score, with Gemini 3.1 Pro and GPT-5.4 trailing behind.
Head-to-Head on Key Tests
Relying on self-reported data from both labs, GPT-5.5 clearly leads in most categories. Here is the breakdown:
- SWE-Bench Pro: GPT-5.5 scored 58.6%; Opus 4.7 scored 64.3%Pricing and AccessOpenAI calls GPT-5.5 its “smartest and most intuitive to use model yet.” Anthropic positions Opus 4.7 as the most advanced model available to Claude users, though it acknowledges that Claude Mythos Preview is actually the stronger model.Only paying subscribers get access to these frontier systems. GPT-5.5 is live for Plus, Pro, Business, and Enterprise users in ChatGPT and Codex. Pro, Business, and Enterprise tiers can also use GPT-5.5 Pro, while GPT-5.5 Thinking is available to all paying tiers except ChatGPT Go.OpenAI has raised API prices for GPT-5.5, but claims it is more token-efficient. Pricing starts at $5 per 1M input tokens and $30 per 1M output tokens, with a 1M context window.For Anthropic, Opus 4.7 is available to Pro and Max customers. API pricing sits at $5 per million input tokens and $25 per million output tokens.Feature ComparisonOpenAI highlights improvements in agentic coding, computer use, knowledge work, and early scientific research. Anthropic emphasizes gains in advanced coding, visual intelligence, and document analysis.Both platforms support research, coding, creative projects, and professional work. You can use both models in their respective coding environments: Codex and Claude Code.The real differentiator lies in their ecosystems. GPT-5.5 is not an image model itself, but within ChatGPT, users can leverage ChatGPT Images 2.0 for full image generation. Claude Design, meanwhile, only handles data visualizations, graphics, and slides. For projects requiring rich visuals or interactive graphics, GPT-5.5 has the broader toolset.ChatGPT also boasts more app and shopping integrations. However, with its recent OpenClaw acquisition, Anthropic has gained an edge in agentic capabilities.The VerdictFor everyday professional work, GPT-5.5 is the better choice, thanks to ChatGPT’s wider feature set. But if your priority is advanced, agentic coding, Claude Opus 4.7 is the model to beat.
