Claude Mythos Preview vs Gemma 4 (Google)
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.
Gemma 4 (Google)
Google DeepMind's open-weights model family -- multimodal, 256K context, runs on edge devices
| Category | Claude Mythos Preview | Gemma 4 (Google) |
|---|---|---|
| Ease of Use | 2.0 | 7.0 |
| Output Quality | 10.0 | 8.0 |
| Value | 5.0 | 10.0 |
| Features | 9.0 | 8.0 |
| Overall | 6.5 | 8.3 |
Personality & Tone
Claude Mythos Preview: The gated red-team specialist
Tone: When Anthropic does publish Mythos outputs (in sanitized research reports), the voice is careful, technically dense, and deliberately unperformed -- much more 'senior security researcher writing an internal memo' than Claude Opus's conversational style.
Quirks: Mythos is tuned to produce its cybersecurity reasoning with extensive show-your-work traces. Anthropic publishes some outputs with full CoT visible as evidence of capability claims. Outside of security tasks, the model reportedly sounds much like Opus 4.6 / 4.7 -- Anthropic hasn't published a distinct general-purpose voice for Mythos.
Gemma 4 (Google): The compact Google cousin
Tone: Similar corporate-Google tone as Gemini but smaller and less polished. Gemma's chat replies are short, cautious, and structured -- closer to a careful intern than a peer.
Quirks: Inherits a Gemini-like safety bias, so refusals appear on prompts Mistral or DeepSeek would answer. Best used as a cheap local fallback or on-device model, not as a personality play.
Pricing Comparison
| Feature | Claude Mythos Preview | Gemma 4 (Google) |
|---|---|---|
| Free Tier | No | Yes |
| Starting Price | Invite only | $0 |
Benchmark Head-to-Head
Gemma 4 31B benchmarks — Claude Mythos Preview has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| MMLU | Knowledge across 57 subjects | 83% |
| GPQA Diamond | Graduate-level science questions | 84.3% |
| AIME 2024 | Competition math problems | 89.2% |
| HumanEval | Python code generation | 85% |
Which Should You Pick?
Pick Claude Mythos Preview if...
- ✓Higher output quality (10 vs 8)
- ✓More features (9 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 Gemma 4 (Google) if...
- ✓Easier to use (7 vs 2)
- ✓Better value for money (10/10)
- ✓Has a free tier
Developers and businesses who need a permissively licensed multimodal LLM they can self-host or fine-tune. Especially good for multilingual use cases and on-device deployment.
Visit Gemma 4 (Google)Our Verdict
Gemma 4 (Google) is the clear winner here with 8.3/10 vs 6.5/10. Claude Mythos Preview isn't bad, but Gemma 4 (Google) 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.