Last refreshed 2026-09-01. Next refresh: weekly.
Why use Claude Mythos 5.1 on Microsoft Foundry?
Microsoft Foundry offers Claude Mythos 5.1 with pay-as-you-go pricing at $10.00/1M input tokens. Microsoft Foundry is a unified Azure platform-as-a-service offering for enterprise AI operations, model builders, and application development.
Compare Claude Mythos 5.1 across 4 providers to find the best fit for your use caseSetup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: claude-mythos-5-1claude-mythos-5-1Request example
claude-mythos-5-1.Gotchas
No curated gotchas have been sourced for this exact provider/model route yet.
Compare Claude Mythos 5.1 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Anthropic | $10.00 | $50.00 |
| AWS Bedrock | — | — |
| GCP Vertex AI | — | — |
| Microsoft Foundry | $10.00 | $50.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $10.00 |
| Output tokens | $50.00 |
Capabilities
About Claude Mythos 5.1
Anthropic's invitation-only Mythos-class model, released September 1, 2026. Same underlying model as Claude Fable 5.1 without the cybersecurity and biology safeguards. Access is limited to a small set of vetted organizations through trusted access / Project Glasswing; Anthropic currently makes it available to a set of US organizations and is working to expand. Claude API id claude-mythos-5-1. Pricing starts at $10 per 1M input tokens and $50 per 1M output tokens (limited availability; no cheaper public tier published). Cache reads $0.25 per 1M. 1M-token context, 128K max output, adaptive thinking always on, text and image input to text output.