Claude Mythos Models by Anthropic
AnthropicProprietary
3 models2026Up to 1m ctxFrom $10/1M input
Last refreshed 2026-09-01. Next refresh: weekly.
Details
ResearcherAnthropic
LicenseProprietary
Commercial useCommercial use: conditional
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 · $10/1M · 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 Preview | Anthropic | $25 | $125 | Serverless |
Popular comparisons in this family
- Claude Mythos Preview vs Grok 41K
- Claude Mythos Preview vs GPT-5.5537
- Claude Mythos Preview vs DeepSeek V4 Pro360
- ByteDance Doubao Seed 2.0 Pro vs Claude Mythos Preview340
- Claude Mythos Preview vs Grok 4.3315
- ByteDance Doubao Seed 2.0 Code vs Claude Mythos Preview191
- Claude Mythos Preview vs GPT-5.5 Pro189
- Claude Mythos Preview vs DeepSeek V4 Flash166
- Claude Mythos Preview vs Xiaomi MiMo-V2.5-Pro150
- Claude Mythos Preview vs Mistral Medium 3.5144
