ChatGPT
Free tier available
- Free$0
- Go$8/mo
- Plus$20/mo
Our pickA
8.8/10ChatGPT
VS
B
7.8/10StepFun Step 3.5 Flash
ChatGPT vs StepFun Step 3.5 Flash
Tier-list head-to-head. ChatGPT takes the A-tier slot — here's the breakdown.
Last reviewed April 24, 2026· sweep-fresh
Spec sheet
At a glance
| ChatGPT | StepFun Step 3.5 Flash | |
|---|---|---|
| Tier | A-tierwin | B-tier |
| Overall score | 8.8 / 10win | 7.8 / 10 |
| Free tier | Yes | Yes |
| Starting price | $0 | $0 |
| Best for | Everyone. | Teams building agent systems on Chinese open-weight foundations who want something other than DeepSeek or Q… |
| Last reviewed | 2026-04-24 | 2026-04-17 |
Head-to-head
Score showdown
Rated 1-10 on the same rubric across all 130 tools we cover.
Ease of use+4.0 ChatGPT
ChatGPT
10.0
StepFun Step 3.5 Flash
6.0
Output qualityTie
ChatGPT
8.0
StepFun Step 3.5 Flash
8.0
Value+1.0 StepFun Step 3.5 Flash
ChatGPT
8.0
StepFun Step 3.5 Flash
9.0
Features+1.0 ChatGPT
ChatGPT
9.0
StepFun Step 3.5 Flash
8.0
Overall+1.0 ChatGPT
ChatGPT
8.8
StepFun Step 3.5 Flash
7.8
What you'll pay
Pricing snapshot
Look past the headline number -- entry-tier limits drive most cost surprises.
StepFun Step 3.5 Flash
Free tier available
- Self-hosted (Apache 2.0)$0
- API (StepFun / OpenRouter)Usage-based/per 1M tokens
Benchmark Head-to-Head
GPT-5.5 (launched 2026-04-23; scores below are the GPT-5.4 baseline -- GPT-5.5 launch benchmarks per OpenAI are logged in Known Issues, pending third-party verification) benchmarks — StepFun Step 3.5 Flash has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| MMLU | Knowledge across 57 subjects | 91% |
| GPQA Diamond | Graduate-level science questions | 92.8% |
| AIME 2024 | Competition math problems | 83.3% |
| HumanEval | Python code generation | 95% |
| SWE-bench | Real GitHub issue fixing | 72% |
| ARC-AGI | Abstract reasoning puzzles | 73.3% |
The decision
Which should you pick?
Use-case anchors and category strengths, side by side.
Pick ChatGPTif…
A
8.8/10- ✓Easier to learn and use day-to-day -- friendlier onboarding curve
- ✓More feature surface area for power users who'll use the depth
- ✓Seriously -- if you're new to AI or want the most complete all-in-one package, ChatGPT is the default recommendation.
Everyone. Seriously -- if you're new to AI or want the most complete all-in-one package, ChatGPT is the default recommendation.
Visit ChatGPTPick StepFun Step 3.5 Flashif…
B
7.8/10- ✓Better value at the price you'll actually pay (9.0/10 on value)
- ✓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.
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 FlashBottom line
The verdict
ChatGPT is the clear winner: 8.8/10 (A-tier) versus 7.8/10 (B-tier). StepFun Step 3.5 Flash isn't a bad tool, but on every category that drives the overall score, ChatGPT comes out ahead. The tier gap is repeatable -- not methodology noise -- and the day-to-day experience reflects it.
Pricing-wise, both tools have a free tier (ChatGPT starts $0, StepFun Step 3.5 Flash starts $0), so you can test either without committing. Compare what each free tier actually unlocks -- usage caps, model access, and feature gates differ a lot more than the headline price suggests, especially as both vendors have tightened limits in 2026.
By use case: pick ChatGPT when everyone. Pick StepFun Step 3.5 Flash when 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. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in ChatGPT's lane, the tier-list ranking and the use-case fit point the same direction; if you're in StepFun Step 3.5 Flash's lane, the score gap matters less than the fit.
Bottom line: ChatGPT is the better tool for most people right now. Pick StepFun Step 3.5 Flash only when 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 -- that's its lane, and inside that lane it still earns its place.
Keep digging
Compare more & explore
Full ChatGPT review
Tier A · 8.8/10
Full StepFun Step 3.5 Flash review
Tier B · 7.8/10
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Built from our daily AI-tool sweep, last touched April 24, 2026. Honest tier-list reviews — no affiliate-link pieces disguised as advice. See the rubric or how we review.