StepFun Step 3.5 Flash vs Claude Design (Anthropic)
Which one should you pick? Here's the full breakdown.
StepFun Step 3.5 Flash
StepFun's (China) agent-focused open-weight model -- Step 3.5 Flash launched 2026-02-01. 196B sparse MoE, ~11B active. Benchmarks slightly ahead of DeepSeek V3.2 at over 3x smaller total size. Step 3 (321B / 38B active, Apache 2.0) and Step3-VL-10B multimodal also in the family
Claude Design (Anthropic)
Anthropic's AI-native design tool -- launched 2026-04-17, built on Opus 4.7. Generates full design systems, website prototypes, slide decks, and one-pagers from natural language. Positioned as a Figma / Canva / Adobe starter-replacement (Figma stock dropped 5% on the launch news)
| Category | StepFun Step 3.5 Flash | Claude Design (Anthropic) |
|---|---|---|
| Ease of Use | 6.0 | 9.0 |
| Output Quality | 8.0 | 8.5 |
| Value | 9.0 | 8.0 |
| Features | 8.0 | 8.0 |
| Overall | 7.8 | 8.4 |
Pricing Comparison
| Feature | StepFun Step 3.5 Flash | Claude Design (Anthropic) |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Which Should You Pick?
Pick StepFun Step 3.5 Flash if...
- ✓Better value for money (9/10)
Teams building agent systems on Chinese open-weight foundations who want something other than DeepSeek or Qwen, especially if agentic tool-use is the primary workload. Also good for Chinese-market products where StepFun's domestic tuning advantages matter. And for anyone looking to add diversity to their open-weight evaluation matrix beyond the top-3 Chinese labs.
Visit StepFun Step 3.5 FlashPick Claude Design (Anthropic) if...
- ✓Easier to use (9 vs 6)
Designers who use Claude Pro or Max and want an AI starting point for design systems, prototypes, slide decks, or one-pagers -- especially when the design decisions need to be internally consistent across many screens or slides. Also good for non-designer product managers and founders who need credible deliverables without hiring.
Visit Claude Design (Anthropic)Our Verdict
Claude Design (Anthropic) edges out StepFun Step 3.5 Flash with a 8.4 vs 7.8 overall score. Both are solid picks, but Claude Design (Anthropic) has the advantage in output quality.