Claude Fable 5.1 vs Claude Opus 5.5
Claude Fable 5.1 from Anthropic and Claude Opus 5.5 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 Fable 5.1 | Claude Opus 5.5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Model id | anthropic/claude-fable-5-1 | anthropic/claude-opus-5-5 |
| Status | Available via Safeguard | Available via Safeguard |
| Input / 1M tokens | $10 | $4 |
| Output / 1M tokens | $50 | $20 |
| Price notes | Base price, full 1M context at standard rate. Cache hits $0.25/1M. Batch 50% off. US-only inference 1.1x. | Base price, full 1M context at standard rate. Cache hits $0.20/1M. 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 | Available |
| Prompts go to | Anthropic (global routing by default) | Anthropic (global routing by default) |
| Retention | 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 | Not used for model training without express permission, per Anthropic's API retention doc, conversation content is not retained by default except for Covered Models that require 30-day retention, flagged content and legal holds can be kept longer |
| 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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