StepFun Step 3.5 Flash vs Manus AI
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
Manus AI
Hosted autonomous AI agent you talk to through Telegram, WhatsApp, and Slack -- the 'no DevOps' alternative to OpenClaw and Hermes
| Category | StepFun Step 3.5 Flash | Manus AI |
|---|---|---|
| Ease of Use | 6.0 | 9.0 |
| Output Quality | 8.0 | 8.0 |
| Value | 9.0 | 7.0 |
| Features | 8.0 | 7.5 |
| Overall | 7.8 | 7.9 |
Pricing Comparison
| Feature | StepFun Step 3.5 Flash | Manus AI |
|---|---|---|
| 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 Manus AI if...
- ✓Easier to use (9 vs 6)
Non-technical users and small business operators who want an autonomous agent reachable from their phone without running any infrastructure. The right pick if 'I don't want to learn Docker' is a hard requirement and you can live with SaaS tradeoffs.
Visit Manus AIOur Verdict
StepFun Step 3.5 Flash and Manus AI are extremely close overall. Your choice comes down to specific needs -- StepFun Step 3.5 Flash is better for 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, while Manus AI works best for non-technical users and small business operators who want an autonomous agent reachable from their phone without running any infrastructure.