Is StepFun Step 3.5 Flash Down?

Quickest ways to check the current status of stepfun.ai plus recent known issues and working alternatives if it's out.

Last editorial review: 2026-04-17

How to check right now

Step 1 -- Load the site
Open stepfun.ai→

The simplest check. If it loads and you can log in, the tool is up for you.

Step 2 -- Crowdsourced reports
DownDetector: StepFun Step 3.5 Flash→

User-reported outages aggregated across regions. Good signal for partial or regional outages.

Step 3 -- Live social
Search X for “StepFun Step 3.5 Flashdown” →

Live tweets from other users. Fastest signal for a fresh outage -- often beats status pages by 10-20 minutes.

Step 4 -- Official status page
Find StepFun Step 3.5 Flash's status page →

Most vendors publish a status page at status.[domain] or on Statuspage.io. Google-search to find the current URL.

Known issues we've tracked

Step 3.5 Flash was released 2026-02-01 with initial quantization issues for Q3 and below -- community Q5 quants are the practical deployment target as of April 2026. Full FP16 weights require significant multi-GPU setup (196B total params even with 11B active)
2026-02•Hugging Face discussions, Reddit r/LocalLLaMA
Refuses discussion of Tiananmen, Taiwan sovereignty, Xi Jinping, and other politically sensitive topics per PRC regulations -- same content filters as other Chinese open-weight models
2026-02•Hugging Face discussions, user reports

Issues here are sourced from our editorial sweeps, not real-time telemetry. Newer issues may exist.

What to use if StepFun Step 3.5 Flash is down

Top AIToolTier-ranked alternatives in the same category, ordered by our overall score.

A

Qwen (Alibaba)

8.8

Alibaba's open-weights + API family -- Qwen 3.6-Max-Preview (Apr 20 2026 CLOSED-weights #1 on SWE-bench Pro/Terminal-Bench 2.0/SciCode), Qwen3.6-35B-A3B (Apr 16 open-weights coding champion), plus Qwen 3.6-Plus API flagship. Apache 2.0 on most sizes, but the best model is now proprietary

A

MiniMax M2 / M2.5

8.4

MiniMax's open-weights frontier -- first open model to match Claude Opus 4.6 on SWE-Bench at 10-20× lower cost

A

Gemma 4 (Google)

8.3

Google DeepMind's open-weights model family -- multimodal, 256K context, runs on edge devices

A

IBM Granite 4.0

8.2

IBM's enterprise-focused open-weight family -- Granite 4.0 hybrid Mamba-2 + transformer architecture (70-80% memory reduction vs pure transformer), 3B to 32B sizes, Apache 2.0. First open model family to secure ISO 42001 certification. Nano 350M runs on CPU with 8-16GB RAM. 3B Vision variant landed 2026-04-01

A

Kimi K2.5 (Moonshot)

8.1

Moonshot's 1T-parameter MoE open-weights flagship -- best open-source agentic coder, rivals Claude Opus 4.5

About StepFun Step 3.5 Flash

Tier B (7.8/10). 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

Read the full StepFun Step 3.5 Flashreview →