Claude Mythos Preview vs IBM Granite 4.0
Which one should you pick? Here's the full breakdown.
Claude Mythos Preview
Anthropic's most capable model -- a gated research preview via Project Glasswing, cybersecurity-specialized. 73% success on expert CTF tasks, 32-step autonomous network attacks. Not generally available.
IBM Granite 4.0
IBM's enterprise-focused open-weight family -- Granite 4.0 hybrid Mamba-2 + transformer architecture (70-80% memory reduction vs pure transformer), 3B to 32B sizes, Apache 2.0. First open model family to secure ISO 42001 certification. Nano 350M runs on CPU with 8-16GB RAM. 3B Vision variant landed 2026-04-01
| Category | Claude Mythos Preview | IBM Granite 4.0 |
|---|---|---|
| Ease of Use | 2.0 | 7.0 |
| Output Quality | 10.0 | 8.0 |
| Value | 5.0 | 9.5 |
| Features | 9.0 | 8.5 |
| Overall | 6.5 | 8.2 |
Pricing Comparison
| Feature | Claude Mythos Preview | IBM Granite 4.0 |
|---|---|---|
| Free Tier | No | Yes |
| Starting Price | Invite only | $0 |
Which Should You Pick?
Pick Claude Mythos Preview if...
- ✓Higher output quality (10 vs 8)
Partner organizations in Project Glasswing doing cybersecurity research, defensive red-teaming, threat intelligence, or large-scale vulnerability triage. If your use case is legitimate cybersecurity and you have enterprise Anthropic contact, ask about Glasswing admission.
Visit Claude Mythos PreviewPick IBM Granite 4.0 if...
- ✓Easier to use (7 vs 2)
- ✓Better value for money (9.5/10)
- ✓Has a free tier
Regulated-industry enterprises (healthcare, finance, government) who need Apache 2.0 open-weight models with ISO 42001 certification. Also ideal for edge deployments where Granite Nano (350M / 1.5B) is one of the few open models that runs realistically on CPU. And for any Mamba-hybrid research or low-memory production use where the 70-80% memory reduction actually changes the economics.
Visit IBM Granite 4.0Our Verdict
IBM Granite 4.0 is the clear winner here with 8.2/10 vs 6.5/10. Claude Mythos Preview isn't bad, but IBM Granite 4.0 outperforms it across the board. Pick Claude Mythos Preview only if partner organizations in project glasswing doing cybersecurity research, defensive red-teaming, threat intelligence, or large-scale vulnerability triage.