Claude Mythos 5.1 Pricing - Cost Calculator

Claude Mythos 5.1: Anthropic’s most capable model for cybersecurity, biology research, advanced coding, scientific discovery, and complex long-running reasoning.

Claude Mythos 5.1, released 1 September 2026, is a multimodal model from Anthropic. It works across a 1,000,000-token context window and returns up to 128,000 tokens, taking text, image and file input and returning text. Training data ends 30 June 2026, and the model reasons step by step. It costs between $5.00 and $10.00 per million input tokens, depending on service tier.

Last updated Sep 14, 2026

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Model Details

Released
Sep 1, 2026
Knowledge Cutoff
Jun 30, 2026
Context Length
1,000,000
Max Output
128,000
Modalities
Text Image File → Text
Capabilities
Tool use Structured outputs Prompt caching Code execution Computer use

Where is Claude Mythos 5.1 a perfect fit?

Claude Mythos 5.1 is Anthropic’s highest-capability restricted model, combining frontier reasoning, coding, cybersecurity, biology, scientific research, and agentic workflows with safeguards designed for vetted organizations.
- Advanced cybersecurity research and defensive security
- Vulnerability discovery and security analysis
- Biological and life-sciences research
- Scientific discovery and computational research
- Complex software engineering and codebase analysis
- Long-running autonomous coding agents
- Multidisciplinary reasoning and difficult knowledge work
- Research workflows requiring extensive tool use

Quick Model Estimate

(USD 10.0000 per 1M tokens)
(USD 50.0000 per 1M tokens)

Your Claude Mythos 5.1 Cost Estimate

💰 Total Cost

—

for 1000 input + 1000 output tokens

📥 Input (1000 × $10.000000) —
📤 Output (1000 × $50.000000) —

Cost Breakdown

📥 Input 📤 Output

Prices updated daily from official provider data.

Pricing

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Modality ↕
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Input Price
(per 1M tokens) ↕
Output Price
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Cached Input
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Cached Output
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Context Size ↕
View
Anthropic LogoAnthropicTextStandard$10.0000$50.0000$0.2500$20.00001,000,000 tokens→
Anthropic LogoAnthropicTextBatch$5.0000$25.0000N/AN/A1,000,000 tokens→

FAQs about Claude Mythos 5.1

How much does Claude Mythos 5.1 cost per 1M tokens?

Claude Mythos 5.1 costs between $5.00 and $10.00 per million input tokens, and between $25.00 and $50.00 per million output tokens. The range covers Standard and Batch pricing.

What does a typical workload cost with Claude Mythos 5.1?

1,000 requests of 2,000 input and 500 output tokens each — 2,000,000 input and 500,000 output tokens in total — costs $22.50 with Claude Mythos 5.1 at its lowest rates. Use the calculator on this page for your own volumes.

Where can I use Claude Mythos 5.1?

Claude Mythos 5.1 is available through Anthropic, from $5.00 per million input tokens.

Is there cheaper Claude Mythos 5.1 pricing than the standard rate?

Yes. Batch pricing for Claude Mythos 5.1 starts at $5.00 per million input tokens against $10.00 on the standard tier, about 50% lower.

What is Claude Mythos 5.1's context window?

Claude Mythos 5.1 has a context window of 1,000,000 tokens, and returns up to 128,000 tokens in a single response.

What input types does Claude Mythos 5.1 support?

Claude Mythos 5.1 accepts text, image and file input, and returns text.

What is Claude Mythos 5.1's knowledge cutoff?

Claude Mythos 5.1's training data runs to 30 June 2026. It has no built-in knowledge of events after that date.