Claude Mythos 5
Restricted-access flagship — vetted partners only.
What is Claude Mythos 5?
Claude Mythos 5 is the Anthropic frontier model with a 200,000 tokens context window, released 2026-06-09. Tagline: Restricted-access flagship — vetted partners only..
Pricing detail. Mythos 5 is the un-released sibling of Fable 5. Same Mythos class, restricted to vetted partners. Made headlines mid-June 2026 when reports of a White-House-driven ban over China access dominated AI press.
How I use it inside the Agent OS. Not currently dispatched from Agent OS — no public API. Tracked for news coverage only.
What I built with Claude Mythos 5
Every model on Goldie Bench gets the same fixed prompt set — one shot, single HTML file out — and I score the result 0–10 inside the Agent Operating System. Here's what Claude Mythos 5 shipped on the bench: 0 one-shot demos across 200,000 tokens of context. Of those, 0 are scored against the field with my honest 0–10 from the source guides at agentos.guide.
Strengths
- Highest-class Anthropic model — sits above Fable 5 in the Mythos line
- Same Mythos-class capability profile as Fable 5 (with restrictions)
Trade-offs
- No public API access — can't be benched against the open field
- Restricted distribution makes it effectively unavailable to most builders
Best for
- Vetted enterprise partners with Mythos-class access
- (For everyone else: read the Mythos ban coverage instead of waiting for access)
Every demo by Claude Mythos 5
0 live demos, sorted by category. Click any tile to play the actual one-shot result. Verdicts and 0–10 scores are pulled from the source guides where I posted them publicly.
Head-to-heads with Claude Mythos 5
Direct comparisons against every other scored model on the bench:
Claude Mythos 5 vs Opus 4.8 Claude Mythos 5 vs GLM-5.2 Claude Mythos 5 vs Grok Claude Mythos 5 vs Qwen 3.7 Claude Mythos 5 vs Kimi K2.7Read more on agentos.guide: /claude-fable-5, /mythos-ban, /claude-mythos-ban, /claude-ban-part-2, /mythos-fable-5-research-report
Run this stack yourself.
Every demo on this bench was built inside the Agent Operating System — one prompt, one shot, single HTML file out. The Agent OS, the prompts, the templates, the weekly walkthroughs and 3,600+ founders shipping with it every day all live inside the AI Profit Boardroom.