Claude Mythos Models by Anthropic
AnthropicProprietary
Anthropic releases · 15 in the last 12 months · this family litChangelog →
3 models2026Up to 1M ctxFrom $10.00/1M input
Last refreshed 2026-09-01. Next refresh: weekly.
Details
ResearcherAnthropic
LicenseProprietary
Commercial useRestricted
Models3
Released2026
Max context1M
Capabilities
VisionAll models
MultimodalAll models
ReasoningAll models
JSON / Tool useAll models
Structured OutputsAll models
Code ExecutionAll models
Links
WebsiteAbout
Anthropic's frontier research model family, positioned above the public Claude 4 line. Released exclusively to invitation-only partners via Project Glasswing for defensive cybersecurity workflows.
Decision facts
- Best fit
- securityagentcoding
- Capability starting point
- Claude Mythos 5.1 with 1M context and reasoning, JSON / Tool use, structured outputs, and multimodal inputs
- Lowest tracked input
- Claude Mythos 5 · $10.00/1M · Anthropic
- Closest related family
- Computer Use
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
3 in view
Claude Mythos 5.1Current
Use when the workload needs security, 1M context, and reasoning.
2026-09security1M contextreasoning
Claude Mythos 5Current
Use when the workload needs security, 1M context, and reasoning.
2026-06security1M contextreasoning
Claude Mythos PreviewCurrent
Use when the workload needs security, 1M context, and reasoning.
2026-05security1M contextreasoning
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| Claude Mythos 5.1 | Use when the workload needs security, 1M context, and reasoning. | 2026-09 | security1M contextreasoning | Current |
| Claude Mythos 5 | Use when the workload needs security, 1M context, and reasoning. | 2026-06 | security1M contextreasoning | Current |
| Claude Mythos Preview | Use when the workload needs security, 1M context, and reasoning. | 2026-05 | security1M contextreasoning | Current |
Release Timeline
3 release groups2026-09
1 current
Claude Mythos 5.1
Currentsecurity1M contextreasoning
2026-06
1 current
Claude Mythos 5
Currentsecurity1M contextreasoning
2026-05
1 current
Claude Mythos Preview
Currentsecurity1M contextreasoning
Specifications(3 models)
| Model | Released | Context | Vision | Multimodal | Reasoning | JSON / Tool use | Structured Outputs | Code Exec |
|---|---|---|---|---|---|---|---|---|
| Claude Mythos 5.1 | 2026-09 | 1M | Yes | Yes | Yes | Yes | Yes | Yes |
| Claude Mythos 5 | 2026-06 | 1M | Yes | Yes | Yes | Yes | Yes | Yes |
| Claude Mythos Preview | 2026-05 | 1M | Yes | Yes | Yes | Yes | Yes | Yes |
Available From(4 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| Claude Mythos 5 | Anthropic | $10 | $50 | Serverless |
| Claude Mythos 5.1 | Anthropic | $10 | $50 | Serverless |
| Claude Mythos 5.1 | Microsoft Foundry | $10 | $50 | Serverless |
| Claude Mythos 5.1 | AWS Bedrock | $11 | $55 | Serverless |
| Claude Mythos Preview | Anthropic | $25 | $125 | Serverless |
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