AI model comparison
Step 3.7 Flash vs Step 3.5 Flash
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
StepFun
Step 3.7 Flash
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model.
- Input / 1M
- $0.20
- Output / 1M
- $1.15
- Context
- 262K
StepFun
Step 3.5 Flash
Step 3.5 Flash is StepFun's most capable open-source foundation model.
- Input / 1M
- $0.10
- Output / 1M
- $0.30
- Context
- 262K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Step 3.5 Flash
2.8x cheaper for a typical chat
Higher intelligence score
Step 3.7 Flash
19.5 vs 17 on Artificial Analysis
Larger context window
Tie
262K vs 262K tokens
Newer release
Step 3.7 Flash
Released May 28, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Coding index
Agentic index
Pricing
Step 3.7 Flash vs Step 3.5 Flash API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | ||
|---|---|---|
| Input tokensPer 1M tokens | $0.20 | $0.10 |
| Output tokensPer 1M tokens | $1.15 | $0.30 |
| Cached input (read)Per 1M tokens | $0.04 | Not available |
| Cache writePer 1M tokens | Not available | Not available |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Coding task
30K in, 4K out
Long document summary
150K in, 2K out
Specs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | ||
|---|---|---|
| Context window | 262K tokens | 262K tokens |
| Max output | 230K tokens | 66K tokens |
| Input types | Image, Text, Video | Text |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium, Low | Not available |
| Default reasoning effort | Medium | Not available |
| Release date | May 28, 2026 | January 29, 2026 |
Features
Supported features
API features available for each model.
| Metric | ||
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Not supported |
| JSON mode | Supported | Not supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- Step 3.7 Flash vs DeepSeek V4 Flash 0423
- Step 3.7 Flash vs Step 5 Preview
- Step 3.7 Flash vs DeepSeek V3.2
- Step 3.7 Flash vs GPT-5 Mini
- Step 3.7 Flash vs Ling 3.0 Flash
- Step 3.7 Flash vs GPT-5.4 Nano
- Step 3.7 Flash vs Qwen3.6 35B A3B
- Step 3.7 Flash vs MiniMax M2.5
- Step 3.7 Flash vs Muse Glimmer 30B
- Step 3.7 Flash vs MiniMax M2.1
- Step 3.7 Flash vs GPT-5.1-Codex-Mini
- Step 3.7 Flash vs Qwen3.5-35B-A3B
- Step 3.7 Flash vs LongCat 2.0
- Step 3.7 Flash vs MiniMax M2
- Step 3.7 Flash vs GLM 4.6
- Step 3.5 Flash vs Hy3
- Step 3.5 Flash vs DeepSeek V3.2
- Step 3.5 Flash vs Ling 3.0 Flash
- Step 3.5 Flash vs Qwen3.6 35B A3B
- Step 3.5 Flash vs Gemma 4 26B A4B
- Step 3.5 Flash vs DeepSeek V3.2 Exp
- Step 3.5 Flash vs Gemini 3.1 Flash Lite
- Step 3.5 Flash vs GLM 4.7 Flash
- Step 3.5 Flash vs Gemma 4 31B
- Step 3.5 Flash vs GPT-5 Nano
Our take
Step 3.5 Flash is 2.8x cheaper for a typical chat. Step 3.7 Flash scores higher on the Artificial Analysis Intelligence Index (19.5 vs 17). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Step 3.7 Flash or Step 3.5 Flash cheaper?
Step 3.5 Flash is cheaper for a typical chat (2K input tokens and 500 output tokens). Step 3.5 Flash costs $0.10 per 1M input tokens and $0.30 per 1M output tokens, while Step 3.7 Flash costs $0.20 per 1M input tokens and $1.15 per 1M output tokens.
Which has a bigger context window, Step 3.7 Flash or Step 3.5 Flash?
Step 3.7 Flash supports up to 262K tokens of context, compared with 262K for Step 3.5 Flash.
Is Step 3.7 Flash smarter than Step 3.5 Flash?
On the Artificial Analysis Intelligence Index, Step 3.7 Flash scores 19.5 and Step 3.5 Flash scores 17, putting Step 3.7 Flash ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Step 3.7 Flash and Step 3.5 Flash at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Step 3.7 Flash and Step 3.5 Flash answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Step 3.7 Flash and Step 3.5 Flash at the same time. Compare the answers side by side and keep the best one.