Claude Mythos 5.1
Claude Mythos 5.1 is the trusted-access sibling of Claude Fable 5.1. Ready to experience the power of AI? Start your journey here!
Platform: Replicate
Reasoning AIRestricted AccessCybersecurity AIScientific Research
Input: $10 per million tokens; Cache read: $0.25 per million tokens; Output: $50 per million tokens; trusted access required
Commercial🚀Function Overview
A high-capability model available only through Anthropic trusted-access programs, with the Fable 5.1 specification profile and a different safeguard boundary.
Key Features
- Stable model ID claude-mythos-5-1 for approved accounts
- Same underlying model and specification profile as Claude Fable 5.1
- 1M-token context window and 128K-token maximum output
- Adaptive thinking is always on
- Text and image input with text output
- Access is invitation-only and is not a general self-serve API option
Use Cases
- •Approved defensive cybersecurity research
- •Vetted life-science research under Anthropic's access program
- •Controlled long-horizon scientific and technical investigation
- •Governed evaluations where Fable safeguards would redirect the required task
⚙️Input Parameters
prompt
stringText instructions for an approved trusted-access workflow
image
stringOptional image input for multimodal analysis
system_prompt
stringSystem-level instructions and governance constraints
effort
stringReasoning effort control for adaptive thinking
max_tokens
integerMaximum output length, up to 128K tokens
💡Usage Examples
Example 1
Input Parameters
{
"prompt": "Review the approved defensive research question and propose an auditable evaluation plan within the program's access controls.",
"system_prompt": "Stay within the authorized research scope and preserve evidence for independent review.",
"effort": "high",
"max_tokens": 8192
}Output Results
I will define the authorized objective, excluded actions, evidence sources, and stop conditions before analysis.
The evaluation will separate observed results from inference and retain an auditable record of each decision.
Any step outside the approved access boundary will be returned for human review rather than executed.
Quick Actions
Technical Specifications
- Hardware Type
- Commercial Use
- Supported
- Pricing
- Input: $10 per million tokens; Cache read: $0.25 per million tokens; Output: $50 per million tokens; trusted access required
- Platform
- Replicate