AI Radar

Claude Mythos 5

Available · Language, Multimodal, Reasoning · Milestone

Claude Mythos 5 is a language model in Anthropic's Claude Mythos line, launched on 9 June 2026 alongside Claude Fable 5 and offered by invitation only through Project Glasswing to a small group of cyber defenders and infrastructure providers. Anthropic says it is the same underlying model as Fable 5 with safeguards lifted in some areas, deployed as an upgrade to Claude Mythos Preview. [1] [2] Primary source

Timeline of Claude Mythos 5 →

Claims and evidence

  • Released Primary source[1] [2]Availability: Released
  • Status AvailableInvitation only, through Project Glasswing. Primary source[3]Model status table [2]Availability: Status [4]update of Jul 1, 2026
  • Change · Other Priced at 10 USD input and 50 USD output per million tokens, against 25 and 125 USD for Mythos Preview.Compared with Claude Mythos Preview Primary source[2] [1] [6]pricing and access paragraph
  • Change · Reasoning Adaptive thinking is the only thinking mode; disabling thinking or setting a manual thinking budget returns an error.Compared with Claude Mythos Preview Primary source[5]Migrating from Claude Mythos Preview [7]June 9, 2026
  • Input text, image Primary source[2]Capabilities: Input and output
  • Output text Primary source[2]Capabilities: Input and output
  • Context window 1M tokens Primary source[2]Capabilities: Context window
  • Parameters Not disclosedNot disclosed by Anthropic. No claim madeNo source
  • Access API, cloud partnerInvitation only, through Project Glasswing. Primary source[2]Availability: Platforms

Lineage

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Variants and derived

None recorded.

Siblings

None recorded.

All ancestors

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Variants

No variants recorded in this record.

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