StepFun · Text model · Preview
Step 5 Preview
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Figures checked 1 Nov 2026. A dash means not published on the sources we checked, so it stays blank rather than estimated. AA index and speed are from Artificial Analysis at the default setting.
Charts
Highlighted point is Step 5 Preview. Grey points are the other 26 text models with both figures. Index at each model's best tested setting.
Show the data as a table
| Model | Index | Blended US$/1M |
|---|---|---|
| GPT-6 Astra | 57 | 20.000 |
| GPT-6.1 Sol | 55 | 4.000 |
| GPT-6.1 Terra | 51 | 2.000 |
| GPT-6 Luna | 28 | 0.200 |
| Claude Fable 5.1 | 50 | 20.000 |
| Claude Opus 5.5 | 58 | 8.000 |
| Claude Sonnet 5.5 | 54 | 4.000 |
| Claude Haiku 5.5 | 36 | 0.200 |
| Gemini 4 Carbon | 59 | 4.000 |
| Gemini 4 Argon | 50 | 4.000 |
| Gemini 3.8 Flash | 31 | 1.500 |
| Gemini 3.5 Flash-Lite | 12 | 0.850 |
| Grok 4.7 | 35 | 3.000 |
| Muse Wonder | 43 | 8.000 |
| Mistral Large 4 | 26 | 1.050 |
| Mistral Small 4 | 4 | 0.262 |
| DeepSeek V4.1 Flash 1017 | 32 | 0.525 |
| DeepSeek V4 Pro | 23 | 1.980 |
| Qwen3.8-Max | 34 | 3.000 |
| Kimi K3.1 Pro | 46 | 4.000 |
| GLM-5.3 | 32 | 2.150 |
| GLM-5.3-Flash | 28 | 0.237 |
| MiniMax M3.1 Flash | 29 | 0.262 |
| MiniMax M3 | 19 | 0.525 |
| MiMo-V2.6-Pro | 30 | 0.544 |
| MiMo-V2.6-Flash | 27 | 0.175 |
| Step 5 Preview | 29 | 1.425 |
US$ per 1M tokens, standard tier, short prompts. Output left blank where not published.
Show the data as a table
| Model | Input US$/1M | Output US$/1M |
|---|---|---|
| Step 5 Preview | 1 | 2.7 |
| Gemini 3.8 Flash | 0.75 | 3.75 |
| Mistral Large 4 | 0.7 | 2.1 |
| GLM-5.3 | 1.4 | 4.4 |
| DeepSeek V4 Pro | 1.32 | 3.96 |
Full sourced profile
| Lab | StepFun |
|---|---|
| Type | Text |
| Status | Preview models.dev (opens in a new tab) |
| Released | 16 Sep 2026 models.dev (opens in a new tab) |
| API access | Yes platform.stepfun.ai (opens in a new tab) |
| API model ID | step-5-preview platform.stepfun.ai (opens in a new tab) |
| API rate limits | – |
| Consumer app plans | – |
| Price at each level | – |
| Input per 1M tokens | US$1 platform.stepfun.ai (opens in a new tab)Cache miss. Cache hit US$0.10 |
| Output per 1M tokens | US$2.7 platform.stepfun.ai (opens in a new tab)Includes reasoning tokens |
| Cached input | US$0.1 platform.stepfun.ai (opens in a new tab) |
| Batch in / out | – |
| Other pricing | – |
| Context window | 1M tokens models.dev (opens in a new tab) |
| Max output | – |
| Input types | text, image, video models.dev (opens in a new tab) |
| Output types | text |
| Weights | Open models.dev (opens in a new tab) |
| Reasoning | Yes models.dev (opens in a new tab) |
| Tool use | Yes models.dev (opens in a new tab) |
| Artificial Analysis index | 29 (default) artificialanalysis.ai (opens in a new tab) |
| Output speed | 165 tokens/s artificialanalysis.ai (opens in a new tab) |
| Time to first token | 0.92 s artificialanalysis.ai (opens in a new tab) |
| Reasoning levels | – |
| Lab benchmark claims | – |
| Limitations |
|
Tools and MCP connectors that fit
StepFun does not document calling MCP servers from its own API. You can still connect tools through an agent or framework. Browse AI tools
Similar alternatives
Same type, closest on quality index and blended price. A similarity, not a ranking.
- Gemini 3.8 FlashGoogle · US$0.75 / US$3.75 per 1M · index 31
- Mistral Large 4Mistral · US$0.7 / US$2.1 per 1M · index 26
- GLM-5.3Z.ai · US$1.4 / US$4.4 per 1M · index 32
- DeepSeek V4 ProDeepSeek · US$1.32 / US$3.96 per 1M · index 23
Compare Step 5 Preview with Gemini 3.8 Flash and Mistral Large 4