Step 3.5 Flash
by StepFunChat
StepFun flash lane for quick multimodal reasoning and coding assistance
- Context
- 256K tokens
- Max output
- 256,000 tokens
- Parameters
- 199B total
- Released
- 2026-01-29
- Weights
- Open
- Licence
- apache-2.0
stepfun/step-3-5-flash · also seen as stepfun-ai/Step-3.5-Flash, deepinfra/stepfun-ai/Step-3.5-Flash
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-01-29
- Weights
- Opennot gated
- License
- apache-2.0
- Input
- Text
- Output
- Text
- Context window
- 256,000 max across endpoints
- Max output
- 256,000
- Providers
- 9 + 7 gateways, not counted as providers
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $0.09–$0.10 in · $0.30 out per 1M tokens · 6 of 9 providers have a comparable price
More details
- Last updated
- 2026-06-15
- Knowledge cutoff
- 2025-01
- Weights link
- Hugging Face · stepfun-ai/Step-3.5-Flash
- Parameters
- 199B total
- Base model
- stepfun-ai/step-3.5-flash
- Developer country
- China
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel toolsunknown
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt cachingunknown
- Web searchunknown
- Computer useunknown
- System messagesunknown
- Assistant prefillunknown
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
Loading endpoints…
Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $0.09 in / $0.30 out per 1M tokens at CommandCode on every data refresh since then.
Tracked from 19 Oct 2026. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs Step 3.5 Flash |
|---|---|---|---|---|---|
| Qwen3 30B A3B Instruct 2507Alibaba (Qwen) | $0.125 | $0.09 | $0.30 | 262K | +0% |
| Gemma-4-31B-ITGoogle | $0.125 | $0.10 | $0.25 | 262K | +0% |
| The Drummer Cydonia 24B v4.3TheDrummer | $0.125 | $0.12 | $0.15 | 131K | +0% |
| Qwen3.5 35B-A3BAlibaba (Qwen) | $0.122 | $0.0564 | $0.451 | 262K | −2% cheaper |
| Doubao Seed 2.0 MiniByteDance Seed | $0.122 | $0.0493 | $0.485 | 256K | −3% cheaper |
| MiniMax-M2.7MiniMax | $0.12 | $0.08 | $0.32 | 205K | −4% cheaper |
| MiMo-V2.6-FlashXiaomi | $0.13 | $0.10 | $0.28 | 1.05M | +4% |
| Mistral Small 3.2 24BMistral AI | $0.12 | $0.0938 | $0.25 | 32.8K | −4% cheaper |
More from StepFun
Newest StepFun models in the catalogue. All StepFun models
| Model | Released | Context | Listed price |
|---|---|---|---|
| Step 5 Preview | 2026-09-16 | 1M | from $0.959 |
| Step 3.7 Flash | 2026-05-29 | 256K | from $0.185 |
| StepAudio 2.5 ASR | 2026-04-24 | — | unpriced |
| StepAudio 2.5 TTS | 2026-04-16 | — | unpriced |
| Step 3.5 Flash 2603 | 2026-04-02 | 256K | from $0.10 |
| Step TTS 2 | 2026-03-01 | — | unpriced |
| Gelab Zero 4b Preview | 2025-12-23 | 8.2K | unpriced |
| Step-3 | 2025-07-31 | 65.5K | unpriced |