Using Claude Mythos Preview on Anthropic

Quick Start

1. 1
   Create an account at Anthropic and generate an API key.
2. 2
   Use the Anthropic SDK or REST API to call claude-mythos-preview — see the documentation for request format.
3. 3
   You'll be billed $25.00/1M input, $125.00/1M output tokens. See full pricing.

Code Examples

import anthropic

client = anthropic.Anthropic()  # reads ANTHROPIC_API_KEY from env
message = client.messages.create(
    model="claude-mythos-preview",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}]
)
print(message.content[0].text)

About Anthropic

Creator of Claude AI models, accessed via the Anthropic API and the Anthropic Console (console.anthropic.com). The Console hosts the Workbench prompt playground, API keys, usage analytics, and team billing.

Anthropic is a safety-focused AI research company and creator of the Claude model family, offering API access through the Anthropic Console for text generation, analysis, and coding tasks.

Pricing on Anthropic

Capabilities

About Claude Mythos Preview

Claude Mythos Preview is Anthropic's frontier research model, positioned above the public Claude 4 family and released exclusively via invitation-only Project Glasswing to roughly 12 launch partners and over 40 organizations working on critical infrastructure. No public API or self-serve access. Specializes in defensive cybersecurity — autonomously identified zero-day vulnerabilities including a 27-year-old OpenBSD TCP SACK remote code execution bug and a 17-year-old FreeBSD NFS RCE. Codenamed Capybara internally. Scores 93.9% on SWE-bench Verified, 82.0% on Terminal-Bench 2.0, and 97.6% on USAMO 2026. Partner pricing: $25/$125 per million tokens (input/output). Max output: 128K tokens. Knowledge cutoff: December 2025.