Claude Fable 5 vs GPT 5.1 Codex Max
Anthropic's Mythos-class flagship for ambitious, long-running professional work.
Extended-context coding model for large codebase operations.
No captured outputs for these models yet.
Frequently Asked Questions: Claude Fable 5 vs GPT 5.1 Codex Max▼
Which is better, Claude Fable 5 or GPT 5.1 Codex Max?
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Both Claude Fable 5 and GPT 5.1 Codex Max 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.
Which is cheaper, Claude Fable 5 or GPT 5.1 Codex Max?
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GPT 5.1 Codex Max has a lower blended cost. Claude Fable 5: $10.00 input / $50.00 output. GPT 5.1 Codex Max: $1.25 input / $10.00 output.
Which has a larger context window, Claude Fable 5 or GPT 5.1 Codex Max?
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Claude Fable 5 has a larger context window: Claude Fable 5 supports 1M tokens vs GPT 5.1 Codex Max at 400K tokens.
Do both Claude Fable 5 and GPT 5.1 Codex Max support vision?
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Yes, both Claude Fable 5 and GPT 5.1 Codex Max support vision/image input.
What are the key differences between Claude Fable 5 and GPT 5.1 Codex Max?
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Key differences: GPT 5.1 Codex Max 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 Claude Fable 5 and GPT 5.1 Codex Max for free on idapt.app to see which performs better for your specific needs.