Anthropic
Claude Mythos 5
Anthropic's June 9, 2026 restricted-access counterpart to Fable 5, available by invitation through Project Glasswing. It shares Fable 5's capabilities but does not include the same safety classifiers, so behavior is not identical. It supports text and image input, a 1M-token context window, up to 128K output and always-on thinking. Mythos 5.1 was released September 1; Mythos 5 remains listed as active.
1M tokens
Multimodal
Max
- Provider
- Anthropic
- Context
- 1MEstimated · As of Aug 11, 2026Stale · 31d old
- yno subscription tier
- Max
- Released
- Jun 9, 2026
- Speed
- Medium
- Reasoning
- Expert
- Modality
- Multimodal
Benchmarks
Quality
- AA Intelligence Index
- 62pointsEstimated · As of Aug 11, 2026Stale · 31d old
- GPQA Diamond
- 93%Estimated · As of Aug 11, 2026Stale · 31d old
Speed and latency
- Output speed
- 63tokens/sEstimated · As of Aug 11, 2026Stale · 31d old
API pricing
Not available
AA measurements unavailable
Indexes use points; evaluations use accuracy percentages. API measurements do not measure yno application performance. Methodology
Capabilities
- Reasoning
- Code
- Agentic
- Vision
- Long Horizon
- Research
Use cases
- Long-horizon agents
- Complex software engineering
- Deep research
- Multi-step automation
Strengths
- Fable 5-class capability
- Restricted Project Glasswing access
- 1M context / 128K output
- Always-on thinking
Best for
Project Glasswing participants who need Fable 5-class capability under restricted access
Use Claude Mythos 5 in yno.ai
No credit card required
Related models
Frequently asked
- What is Claude Mythos 5?
- Anthropic's June 9, 2026 restricted-access counterpart to Fable 5, available by invitation through Project Glasswing. It shares Fable 5's capabilities but does not include the same safety classifiers, so behavior is not identical. It supports text and image input, a 1M-token context window, up to 128K output and always-on thinking. Mythos 5.1 was released September 1; Mythos 5 remains listed as active.
- How much does Claude Mythos 5 cost in yno.ai?
- Claude Mythos 5 is available on the Max tier of yno.ai.
- What can Claude Mythos 5 do?
- Claude Mythos 5 is best for Project Glasswing participants who need Fable 5-class capability under restricted access. Its main capabilities include Reasoning, Code, Agentic, Vision, Long Horizon, Research.
- How does Claude Mythos 5 compare to other models?
- Claude Mythos 5 excels at Fable 5-class capability and is recommended for Long-horizon agents, Complex software engineering, Deep research, Multi-step automation. See related models below.
- How do I use Claude Mythos 5 in yno.ai?
- Sign up for yno.ai, select Claude Mythos 5 from the model picker, and start chatting.