Claude Mythos 5.1 vs Claude Fable 5.1
Claude Mythos 5.1 from Anthropic and Claude Fable 5.1 from Anthropic, side by side. Every figure comes from the model registry. No markup on model usage: you pay the provider's list price.
| Attribute |   Claude Mythos 5.1 | Claude Fable 5.1 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Model id | anthropic/claude-mythos-5-1 | anthropic/claude-fable-5-1 |
| Status | Available via Safeguard | Available via Safeguard |
| Input / 1M tokens | $10 | $10 |
| Output / 1M tokens | $50 | $50 |
| Price notes | Base price, same as Claude Fable 5.1. Anthropic requires the organization to be verified through one of its programs before use. Cache hits $0.25/1M. Batch 50% off. | Base price, full 1M context at standard rate. Cache hits $0.25/1M. Batch 50% off. US-only inference 1.1x. |
| Context | 1M | 1M |
| Parameters | Not published | Not published |
| Max output | 128,000 tokens | 128,000 tokens |
| Modality | Text and image | Text and image |
| Weights | Closed | Closed |
| Zero data retention | Not offered | Not offered |
| Prompts go to | Anthropic (global routing by default) | Anthropic (global routing by default) |
| Retention | Not used for model training without express permission. Claude Mythos 5.1 is a Covered Model that requires 30-day data retention and is not available under ZDR unless Anthropic expressly authorizes it | Not used for model training without express permission. Claude Fable 5.1 is a Covered Model that requires 30-day data retention and is not available under ZDR unless Anthropic expressly authorizes it |
| Region | Global by default, US-only inference via inference_geo at 1.1x pricing (Claude 4.6 and later) | Global by default, US-only inference via inference_geo at 1.1x pricing (Claude 4.6 and later) |
| Price checked | 2026-10-08 | 2026-10-08 |
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