Plain-English Summary
An invitation-only Claude 5 model for specialized, high-end professional and agentic workloads.
Claude Mythos 5
An invitation-only Claude 5 model for specialized, high-end professional and agentic workloads.
Claude 5
Reasoning LLM
Limited access
Open weights: No
API: Limited
Technical Notes
Limited-access multimodal model with adaptive reasoning, 1M context, 128K output, and tool support.
Best For
Selected enterprise and advanced research use cases
Watch Out For
Invitation only; availability and product terms are restricted.
Model Specs
- Maker
- Anthropic
- Country
- USA
- Family
- Claude 5
- Type
- Reasoning LLM
- Release date
- 2026-06-09
- Date confidence
- Exact
- Status
- Limited access
- Context window
- 1,000,000 tokens
- Max output
- 128,000
- Parameters
- Not disclosed
- Active parameters
- Not disclosed
- Architecture
- Proprietary multimodal transformer
- Reasoning
- Yes — adaptive
- Tool calling
- Yes
- Structured output
- Yes
- API available
- Limited
- Open weights
- No
- Self-hostable
- No
- License
- Proprietary
- Inputs
- Text, image
- Outputs
- Text
- Approx. price
- $10 input / $50 output per 1M tokens
- How to access
- Provider website
- Model / API ID
- claude-mythos-5
- Knowledge cutoff
- 2026-01
- Fine-tuning
- Prompting / RAG
- Completeness
- 90 %
- Verified
- Jul 18, 2026
- Snapshot date
- Jul 18, 2026
- Source
- Official source