Anthropic's new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
NousResearch's flagship large-scale reasoning model based on Llama 4.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Opus 5.5 and Hermes 4 405B 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.
Hermes 4 405B has a lower blended cost. Claude Opus 5.5: $4.00 input / $20.00 output. Hermes 4 405B: $1.00 input / $3.00 output.
Claude Opus 5.5 has a larger context window: Claude Opus 5.5 supports 1M tokens vs Hermes 4 405B at 131K tokens.
Claude Opus 5.5 supports vision/image input, but Hermes 4 405B does not.
Key differences: Hermes 4 405B is significantly cheaper; only Claude Opus 5.5 supports vision input. 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 Opus 5.5 and Hermes 4 405B for free on idapt.app to see which performs better for your specific needs.