Claude (Anthropic) vs StepFun Step 3.5 Flash
Which one should you pick? Here's the full breakdown.
Claude (Anthropic)
Anthropic's flagship LLM -- Opus 4.7 (launched April 16, 2026) with 1M-token context, high-res vision, new xhigh reasoning level, and the most natural conversational style
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
| Category | Claude (Anthropic) | StepFun Step 3.5 Flash |
|---|---|---|
| Ease of Use | 9.0 | 6.0 |
| Output Quality | 9.0 | 8.0 |
| Value | 8.0 | 9.0 |
| Features | 8.0 | 8.0 |
| Overall | 8.5 | 7.8 |
Pricing Comparison
| Feature | Claude (Anthropic) | StepFun Step 3.5 Flash |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Benchmark Head-to-Head
Claude Opus 4.7 (4.6 baseline scores shown; 4.7 announced 13% coding lift, 3x production task completion) benchmarks — StepFun Step 3.5 Flash has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| MMLU | Knowledge across 57 subjects | 91.3% |
| GPQA Diamond | Graduate-level science questions | 91.3% |
| AIME 2024 | Competition math problems | 99.8% |
| HumanEval | Python code generation | 94% |
| SWE-bench | Real GitHub issue fixing | 80.8% |
| ARC-AGI | Abstract reasoning puzzles | 75.2% |
Which Should You Pick?
Pick Claude (Anthropic) if...
- ✓Higher output quality (9 vs 8)
- ✓Easier to use (9 vs 6)
Writers, analysts, developers, and anyone who values quality of output over quantity of features. If you care about how good the actual text is, Claude is the best.
Visit Claude (Anthropic)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 FlashOur Verdict
Claude (Anthropic) edges out StepFun Step 3.5 Flash with a 8.5 vs 7.8 overall score. Both are solid picks, but Claude (Anthropic) has the advantage in output quality.