GPT-6.1 Sol vs Claude Mythos 5.1
GPT-6.1 Sol from OpenAI and Claude Mythos 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 |   GPT-6.1 Sol |   Claude Mythos 5.1 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Model id | openai/gpt-6.1-sol | anthropic/claude-mythos-5-1 |
| Status | Available via Safeguard | Available via Safeguard |
| Input / 1M tokens | $2 | $10 |
| Output / 1M tokens | $10 | $50 |
| Price notes | Standard tier, prompts <=272K input tokens. Over 272K: $4 in / $15 out. Cached input $0.10. | 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. |
| Context | 1.05M | 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 | Available | Not offered |
| Prompts go to | OpenAI (no processing-region constraint by default) | Anthropic (global routing by default) |
| Retention | API data not used for training unless you opt in, abuse monitoring logs that can include prompts and responses kept up to 30 days by default, some features store application state | 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 |
| Region | Global by default, data residency projects in US, EU and other regions (approval required, 10% uplift for models released on or after 2026-03-05) | 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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