Claude Mythos Preview
Anthropic — Claude Mythos Preview
Model Details
According to Anthropic, Claude Mythos Preview (gated research preview) is a new class of intelligence built for ambitious projects focusing on cybersecurity, autonomous coding, and long-running agents.
Available only as a gated research preview with access prioritized for defensive cybersecurity use cases.
Model launch date: Apr 07, 2026
Model EOL date: N/A
End User License Agreements and Terms of Use: View
Model lifecycle: Preview
Context window: 1M tokens
Max output tokens: 128K
Reasoning: Supported
Knowledge cutoff: Dec 2025
| Input Modalities | Output Modalities | APIs supported | Endpoints supported |
|---|---|---|---|
 Audio | Embedding | Responses | bedrock-runtime |
 Image | Image | Chat Completions | bedrock-mantle |
| Speech | Speech | Invoke | |
| Text | Text | Converse | |
| Video | Video | Messages |
Capabilities and Features
Bedrock Features
Features supported using bedrock-mantle endpoint
Pricing
For pricing, please refer to the Amazon Bedrock Pricing
Programmatic Access
Use the following model IDs and endpoint URLs to access this model programmatically. For more information about the available APIs and endpoints, see APIs supported and Endpoints supported.
| Endpoint | Model ID | In-Region endpoint URL | Geo inference ID | Global inference ID |
|---|---|---|---|---|
bedrock-mantle |
anthropic.claude-mythos-preview |
https://bedrock-mantle.{region}.api.aws/v1 |
N/A | N/A |
For example, if region is us-east-1 (N. Virginia), then the bedrock-mantle endpoint URL will be "https://bedrock-mantle.us-east-1.api.aws/v1".
Service Tiers
Amazon Bedrock offers multiple service tiers to match your workload requirements. Standard provides pay-per-token access with no commitment. Priority offers higher throughput with a time-based commitment. Flex provides lower-cost access for flexible, non-time-sensitive workloads. Reserved provides dedicated throughput with a term commitment for predictable workloads. For more information, see service tiers.
| Standard | Priority | Flex | Reserved |
|---|---|---|---|
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Regional Availability
Regional availability at a glance
Bedrock offers three inference options: In-Region keeps requests within a single Region for strict compliance, Geo Cross-Region routes across Regions within a geography (US, EU, etc.) for higher throughput while respecting data residency, and Global Cross-Region routes anywhere worldwide for maximum throughput when there are no residency constraints. Refer to the Regional availability page for more details.
| Region | In-Region | Geo | Global |
|---|---|---|---|
us-east-1 (N. Virginia) | | | |
