Claude Mythos 5
Anthropic's experimental Claude model for open-ended scientific inquiry and long-horizon reasoning, documented as limited to approved Project Glasswing researchers.
Provider
Anthropic
Model family
Anthropic Claude
Multimodal LLM
Cost tier
Mythos
Status
Preview
Why teams choose it
Complex reasoning
Useful for workflows that require structured thinking, multi-step logic, and deeper analysis than lightweight models provide.
Long-context analysis
Helps teams summarize, compare, and extract insights from long documents without losing important nuance.
Coding and tools
Works well for code assistance, tool calling, and agent workflows where instructions must stay consistent across steps.
Cost-efficient routing
Useful as part of a routing stack where cheap models handle drafts and confirmations and this tier handles genuinely hard passages.
Tradeoffs to know
- Availability is limited; do not present it as a generally available production model.
When not to use this
- Self-hosting outcomes depend on hardware, quantization, and ops maturity—budget time beyond swapping an API hostname.
- May demand more instrumentation than SaaS-managed APIs to duplicate latency, failover, and support guarantees.
- Benchmark prompts and regressions continuously before rewriting entire routing tables around weights.
Technical specs
- Inputs
- text, image
- Outputs
- text
- Capabilities
- scientific reasoning, long-horizon reasoning, multimodal, experimentation
- License
- Proprietary limited access
- Model string
claude-mythos-5
Benchmarks
No benchmark data yet.
Anthropic Claude family lineup
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Previous versions
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