GPT 5.4 Pro vs Claude Fable 5
OpenAI's most advanced reasoning model, built on GPT 5.4's unified architecture.
Anthropic's Mythos-class flagship for ambitious, long-running professional work.
No captured outputs for these models yet.
Frequently Asked Questions: GPT 5.4 Pro vs Claude Fable 5▼
Which is better, GPT 5.4 Pro or Claude Fable 5?
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Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 89.1). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, GPT 5.4 Pro or Claude Fable 5?
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Claude Fable 5 has a lower blended cost. GPT 5.4 Pro: $30.00 input / $180.00 output. Claude Fable 5: $10.00 input / $50.00 output.
Which has a larger context window, GPT 5.4 Pro or Claude Fable 5?
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GPT 5.4 Pro has a larger context window: GPT 5.4 Pro supports 1.1M tokens vs Claude Fable 5 at 1M tokens.
Do both GPT 5.4 Pro and Claude Fable 5 support vision?
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Yes, both GPT 5.4 Pro and Claude Fable 5 support vision/image input.
What are the key differences between GPT 5.4 Pro and Claude Fable 5?
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Key differences: Claude Fable 5 is significantly cheaper. Compare full specs on this page.
Which model should I choose for my use case?
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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 Fable 5 for free on idapt.app to see which performs better for your specific needs.