OpenAI's high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.
Anthropic's upgraded Mythos-class flagship, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work.
No shared demos for these models yet.
No captured outputs for these models yet.
Both GPT 5.5 Pro and Claude Fable 5.1 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 Fable 5.1 has a lower blended cost. GPT 5.5 Pro: $30.00 input / $180.00 output. Claude Fable 5.1: $10.00 input / $50.00 output.
GPT 5.5 Pro has a larger context window: GPT 5.5 Pro supports 1.1M tokens vs Claude Fable 5.1 at 1M tokens.
Yes, both GPT 5.5 Pro and Claude Fable 5.1 support vision/image input.
Key differences: Claude Fable 5.1 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 5.5 Pro and Claude Fable 5.1 for free on idapt.app to see which performs better for your specific needs.