Compare models
Pick two to four models. No markup on model usage: you pay the provider's list price.
| Attribute |   Claude Mythos 5.1 |  Muse Spark 1.3 |
|---|---|---|
| Provider | Anthropic | Meta |
| Model id | anthropic/claude-mythos-5-1 | meta/muse-spark-1.3 |
| Status | Available via Safeguard | Available via Safeguard |
| Input / 1M tokens | $10 | $1.25 |
| Output / 1M tokens | $50 | $4.25 |
| 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. | Standard tier (no training on your data). Cached input $0.15. No long-context premium. Contributor tier (muse-spark-1.3-contributor) is $0.10 / $0.20 in exchange for allowing training. Audio input not fully supported on 1.3. |
| Context | 1M | 1.05M |
| Parameters | Not published | Not published |
| Max output | 128,000 tokens | Not published |
| Modality | Text and image | Text and image |
| Weights | Closed | Closed |
| Zero data retention | Not offered | Not stated |
| Prompts go to | Anthropic (global routing by default) | Meta (Meta Model API) |
| 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 | Standard tier: prompts and completions not used to train Meta models, Contributor tier allows training in exchange for lower prices. No retention period published in the API docs |
| Region | Global by default, US-only inference via inference_geo at 1.1x pricing (Claude 4.6 and later) | Not stated |
| Price checked | 2026-10-10 | 2026-10-10 |
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