StepFun
14 releases on record since 1 Mar 2024. The typical gap between releases is 44 days.
- Latest release
- Step 5 Preview16 Sep 2026
- Days since
- 21
- Typical gap
- 44 daysMiddle half 31–111 days, from 9 gaps
- Shortest and longest gap
- 8 and 339 days
Next release
EstimateBetween 19 Oct 2026 and 1 Aug 2027
From the last 9 gaps between StepFun releases. Gaps of 21 days or less are left out, because that much time has already passed. The window covers the middle 80% of the gaps that are left.
How often windows like this were right: 2 of 3 times for StepFun, 315 of 437 times (72%) across all labs, replaying each lab's past releases. A window aims for 8 in 10.
Saved estimates (1)
| Made | After | Window | Outcome |
|---|---|---|---|
| 7 Oct 2026 | Step 5 Preview | 19 Oct 2026 – 1 Aug 2027 | Open |
History
| Date | Model | Gap | Date from | Listed on |
|---|---|---|---|---|
| 16 Sep 2026 | Step 5 Preview | 111 d | 2 sources agree
| Vercel AI Gateway+7 more on models.devempiriolabs, nano-gpt, stepfun-ai-step-plan, stepfun-step-plan, stepfun-ai, aihubmix, StepFun |
| 29 May 2026 | Step Router V1 One host lists it; not counted | – | models.dev metadata
| 1 host on models.devstepfun-step-plan |
| 29 May 2026 | Step 3.7 Flash Thinking Variant of Step 3.7 Flash | – | models.dev metadata
| 1 host on models.devnano-gpt |
| 29 May 2026 | Step 3.7 Flash Free Variant of Step 3.7 Flash | – | models.dev metadata
| 3 hosts on models.devkilo, unorouter, kenari |
| 29 May 2026 | Step 3.7 Flash Free Variant of Step 3.7 Flash | – | models.dev metadata
| 1 host on models.devzenmux |
| 28 May 2026 | Step 3.7 Flash | 34 d | 4 sources agree
| OpenRouter, Vercel AI Gateway, DeepInfra, Hugging Face, NVIDIA NIM, Requesty, Novita+13 more on models.devempiriolabs, stepfun-ai-step-plan, llmgateway-providers, kilo, stepfun-step-plan, zenmux, ambient, stepfun-ai, aihubmix, edenai, StepFun, kenari, llmgateway |
| 24 Apr 2026 | Stepaudio 2.5 Asr | 8 d | models.dev metadata
| 2 hosts on models.devstepfun-ai, StepFun |
| 16 Apr 2026 | Stepaudio 2.5 Tts | 46 d | models.dev metadata
| 2 hosts on models.devstepfun-ai, StepFun |
| 2 Apr 2026 | Step 3.5 Flash 2603 Update of Step 3.5 Flash | – | models.dev metadata
| 6 hosts on models.devempiriolabs, nano-gpt, stepfun-ai-step-plan, stepfun-step-plan, stepfun-ai, StepFun |
| 1 Mar 2026 | Step Tts 2 | 31 d | models.dev metadata
| 2 hosts on models.devstepfun-ai, StepFun |
| 29 Jan 2026 | Step 3.5 Flash | 339 d | 3 sources agree
| OpenRouter, Vercel AI Gateway, Hugging Face, NVIDIA NIM+12 more on models.devempiriolabs, nano-gpt, stepfun-ai-step-plan, siliconflow, kilo, stepfun-step-plan, zenmux, siliconflow-cn, qiniu-ai, stepfun-ai, edenai, StepFun |
| 23 Dec 2025 | Gelab Zero 4b Preview One host lists it; not counted | – | models.dev metadata
| 1 host on models.devqiniu-ai |
| 31 Jul 2025 | Step 3 One host lists it; not counted | – | models.dev metadata
| 1 host on models.devzenmux |
| 24 Feb 2025 | Step Video T2V | 10 d | Epoch AI model data
| – |
| 18 Feb 2025 | Step Audio Chat 130b | – | Epoch AI model data
| – |
| 14 Feb 2025 | Step Audio Tts 3b | 44 d | Epoch AI model data
| – |
| 1 Jan 2025 | Step 2 16k | – | models.dev metadata
| 2 hosts on models.devstepfun-ai, StepFun |
| 1 Jan 2025 | Step 1 32k | 306 d | models.dev metadata
| 2 hosts on models.devstepfun-ai, StepFun |
| 1 Mar 2024 | Step 2 | – | Epoch AI model data
| – |
| 1 Mar 2024 | Step 1x | – | Epoch AI model data
| – |
| 1 Mar 2024 | Step 1.5v | – | Epoch AI model data
| – |
Gap is the days since the previous release. Dates are the earliest a source reports; where sources disagree, two or more agreeing sources win over one. These are past dates. Only the Next release panel is an estimate.
Release dates include data from Epoch AI, Data on AI Models (CC BY 4.0).