OpenAI's most advanced reasoning model, built on GPT 5.4's unified architecture.
Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.
No shared demos for these models yet.
No captured outputs for these models yet.
Both GPT 5.4 Pro and Claude Sonnet 5.5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.
Claude Sonnet 5.5 has a lower blended cost. GPT 5.4 Pro: $30.00 input / $180.00 output. Claude Sonnet 5.5: $2.00 input / $10.00 output.
GPT 5.4 Pro has a larger context window: GPT 5.4 Pro supports 1.1M tokens vs Claude Sonnet 5.5 at 1M tokens.
Yes, both GPT 5.4 Pro and Claude Sonnet 5.5 support vision/image input.
Key differences: Claude Sonnet 5.5 is significantly cheaper. Compare full specs on this page.
If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.4 Pro and Claude Sonnet 5.5 for free on idapt.app to see which performs better for your specific needs.