Claude Mythos 5

Closed Active Multimodal claude-mythos-5

Same model as Claude Fable 5 with some safeguards lifted; limited to Project Glasswing defenders.

Released
Jun 9, 2026
Context window
1M tokens
Max output
128K tokens
Parameters
Not disclosed
Input price
$10.00 per 1M
Output price
$50.00 per 1M

Prices are first-party list prices in USD at the standard tier. Last verified Oct 30, 2026.

Pricing

Launch priceJun 9, 2026
$10.00 in / $50.00 out
Current price since Jun 9, 2026
$10.00 in / $50.00 out
Cached input $1.00 per 1M
TierEffectiveInputOutputCached
Standard Jun 9, 2026 – now $10.00 $50.00 $1.00
Batch Jun 9, 2026 – now $5.00 $25.00 -

Specifications

Developer
Anthropic
Model type
Multimodal
Architecture
Not disclosed
Parameters
Not disclosed
Input
Text Image
Output
Text
Knowledge cutoff
Not disclosed
License
Proprietary
API access
First-party API
Capabilities
Agentic Coding Flagship Long context Reasoning Vision