Claude Mythos 5

proprietary

Available through Project Glasswing. Successor to Claude Mythos Preview.

Intelligence
Reasoning
Context
1M
Max output
128K
Input price
$10/1M tokens
Output price
$50/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDclaude-mythos-5
Provider Anthropic
Creator anthropic
Familyclaude-mythos
Licenseproprietary
Statusactive
Typechat
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1M tokens
Max input—
Max output128K tokens
Reasoning tokens—
Thinking modesAdaptive
Knowledge cutoff—
Release date—
Retirement date
Priority tierYes
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Endpoints

MessagesPOST
Create messages with multi-turn conversationshttps://api.anthropic.com/v1/messages

Pricing

Input
$10
Output
$50
Cache write (5m)
$12.5
Cache write (1h)
$20
Cache read
$1
Batch in
$5
Batch out
$25

Family Comparison: claude-mythos

ModelContextMax outPricing
Claude Mythos 5.1——$10$50
Claude Mythos 51M128K$10$50

API

GET/v1/models/anthropic/claude-mythos-5

Claude Mythos 5

claude-mythos-5

Available through Project Glasswing. Successor to Claude Mythos Preview.

Changes · 3 entries
claude-mythos-5createca7a400Nov 2, 2026, 03:02 AM
claude-mythos-5update3170597Sep 19, 2026, 06:34 AM
retirement_date2027-06-09
claude-mythos-5update88d97e5Jun 30, 2026, 04:49 AM
tools["function_calling","computer_use","mcp"]→["function_calling"]