OpenAI's latest frontier model, unifying the Codex and GPT lines into one system.
Anthropic's new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
No shared demos for these models yet.
No captured outputs for these models yet.
Both GPT 5.4 and Claude Opus 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.
GPT 5.4 has a lower blended cost. GPT 5.4: $2.50 input / $15.00 output. Claude Opus 5.5: $4.00 input / $20.00 output.
GPT 5.4 has a larger context window: GPT 5.4 supports 1.1M tokens vs Claude Opus 5.5 at 1M tokens.
Yes, both GPT 5.4 and Claude Opus 5.5 support vision/image input.
GPT 5.4 and Claude Opus 5.5 have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.
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 and Claude Opus 5.5 for free on idapt.app to see which performs better for your specific needs.