Claude Mythos 5
Model overview
claude-mythos-5
A limited-access Project Glasswing model sharing Fable 5's underlying capabilities without the same safety classifiers.
general LLMreasoningcodingvision-languageagentcomputer uselong contextsoftware engineering agententerprise accessevaluation
Representative version
claude-mythos-5
| Company | Anthropic |
|---|---|
| Release | 2026-06-09 |
| Release type | Preview release |
| Parameters | Not disclosed |
| Architecture | Not disclosed |
| Context | 1,000,000 |
| Input modalities | text / image |
| Output modalities | text |
| Tool use / function calling | Confirmed: Tool use, Function calling |
| Structured output / reasoning | Confirmed: Structured output, Reasoning |
| Vision / audio / video | Confirmed: Vision; Not shown: Audio, Video |
| Open weights / License | No open weights currently / weight license not disclosed anthropic-claude-mythos-5-current · License not applicable |
| Vendor API | Available Introducing Claude Fable 5 and Claude Mythos 5anthropic-claude-mythos-5-current · 2026-06-09 |
| OpenRouter | Not separately listed on OpenRouter |
| Pricing | Official · 2026-06-09: $10 / $50 input / output, per 1M tokens |
| Benchmark | No reliable public source |
| Public signals | No reliable public source |
| Use cases | Long-horizon agents / Complex coding / Enterprise knowledge work / Vision analysis |
| Claim evidence | Release event / Model specificationsIntroducing Claude Fable 5 and Claude Mythos 5claude-mythos-5 · 2026-06-09 · Claude Mythos 5 · claude-mythos-5 |
OpenRouter
Pricing / context / availability
| OpenRouter | Not separately listed on OpenRouter |
|---|---|
| OpenRouter listing | Not separately listed in the current OpenRouter public list |
| Mapped version | claude-mythos-5 anthropic-claude-mythos-5-current |
| Pricing | Official · 2026-06-09: $10 / $50 input / output, per 1M tokens |
| Context | 1000000 |
| Speed/Latency | No reliable public source |
| Snapshot time | 2026-08-11T06:28:09.895Z |
| Source | View source |
Verified limitations
Usage boundaries
- Closed-source parameter counts are not officially disclosed.
- Available only to approved Project Glasswing customers.
- Not available under zero data retention.
Missing public information
Public information not yet available
Parameter scale not disclosedNot listed on OpenRouterNo reliable benchmark sourceNo public model-card activity countersNo linkable model-specific reviewSpeed/latency not disclosed