Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.
OpenAI's previous frontier model for complex professional workloads, built on GPT-5.4 with stronger reasoning and higher reliability.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Sonnet 5.5 and GPT 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. Claude Sonnet 5.5: $2.00 input / $10.00 output. GPT 5.5: $5.00 input / $30.00 output.
GPT 5.5 has a larger context window: Claude Sonnet 5.5 supports 1M tokens vs GPT 5.5 at 1.1M tokens.
Yes, both Claude Sonnet 5.5 and GPT 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 Claude Sonnet 5.5 and GPT 5.5 for free on idapt.app to see which performs better for your specific needs.