Claude Mythos Preview vs Qwen (Alibaba)
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.
Qwen (Alibaba)
Alibaba's open-weights + API family -- Qwen 3.6-Plus (Mar 30 2026, 1M context + always-on CoT + agentic tool-use), Qwen3.5 Small (2B runs on iPhone, 9B matches 120B-class models), plus Qwen3.5-Omni native multimodal. Apache 2.0 on the open sizes
| Category | Claude Mythos Preview | Qwen (Alibaba) |
|---|---|---|
| Ease of Use | 2.0 | 7.0 |
| Output Quality | 10.0 | 9.0 |
| Value | 5.0 | 10.0 |
| Features | 9.0 | 9.0 |
| Overall | 6.5 | 8.8 |
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.
Qwen (Alibaba): The multilingual Alibaba all-rounder
Tone: Helpful, verbose, and notably strong in Chinese and other non-English languages. Qwen is chattier than Mistral or DeepSeek and tends toward structured, multi-section replies.
Quirks: Best-in-class at Chinese -- occasionally switches to Mandarin mid-response for technical or cultural topics even when prompted in English. Political refusal patterns mirror other Chinese models on China-specific topics.
Pricing Comparison
| Feature | Claude Mythos Preview | Qwen (Alibaba) |
|---|---|---|
| Free Tier | No | Yes |
| Starting Price | Invite only | $0 |
Benchmark Head-to-Head
Qwen3.5-397B MoE benchmarks — Claude Mythos Preview has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| MMLU-Pro | Harder multi-subject reasoning | 83.5% |
| GPQA Diamond | Graduate-level science questions | 78.2% |
| AIME 2025 | 87% | |
| HumanEval | Python code generation | 92.5% |
| SWE-Bench Verified | 69.4% |
Which Should You Pick?
Pick Claude Mythos Preview if...
- ✓Higher output quality (10 vs 9)
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 Qwen (Alibaba) if...
- ✓Easier to use (7 vs 2)
- ✓Better value for money (10/10)
- ✓Has a free tier
Developers who want frontier-tier open weights with Apache 2.0 licensing. Qwen3-Coder-Next is arguably the best local coding model; Qwen3.5-397B is a top-3 open generalist.
Visit Qwen (Alibaba)Our Verdict
Qwen (Alibaba) is the clear winner here with 8.8/10 vs 6.5/10. Claude Mythos Preview isn't bad, but Qwen (Alibaba) 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.