Anthropic
Anthropic Claude model for long-running agentic coding and knowledge work.
1M ctxUSD 4 / 1M input tok; USD 20 / 1M output tok
Introducing Claude Mythos PreviewAnthropicReleased March 15, 2026
Claude Mythos Preview
A preview of Anthropic’s next-generation autonomous reasoning system with 1M context, deployed for frontier safety evaluation.
reasoning-llmResearch Only$10.00 / 1M tok (Mythos Preview)Context: 1M (1,000,000 tokens)Arena ELO: 1510
Technical Specifications
Architecture Type
Autonomous Frontier Research Architecture
Total Parameters
Next-Gen Research Scale
Context Window
1M (1,000,000 tokens)
Max Output Tokens
128K (128,000 tokens)
Knowledge Cutoff
January 2026
Supported Modalities
text, code, vision, reasoning
License & Access
Anthropic Research Preview Terms
Benchmark Evaluations
Mmlu Pro
90.4
Gpqa Diamond
85
Swe Bench Verified
82.5
Chatbot Arena ELO
1510
Deep Architectural Overview
Claude Mythos Preview tested full-horizon autonomy and self-directed scientific experimentation under rigorous Responsible Scaling Policy (RSP) Tier 3 safety protocols.
Strengths & Considerations
Core Strengths
- 1,000,000 token context window
- 128k output buffer for comprehensive artifact generation
- Advanced multi-day research synthesis
Known Limitations
- Restricted preview access under Anthropic safety agreements
Token & API Pricing
Input Tokens (1M)$10.00
Output Tokens (1M)$50.00
Cached Input (1M)$1.0000
Pricing is verified directly against Anthropic's developer documentation and API rate sheets.
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