Step 3.5 Flash 2603
stepfun/step-3.5-flash-2603StepFun flash model for efficient multimodal reasoning, coding, and tool use
Context
256K
256,000 tokens
Max output
256K
256,000 tokens
Input
$0.10
per 1M tokens
Output
$0.31
per 1M tokens
Providers
6
6 listings
Intelligence
—
Not yet scored
Pricing
USD per 1M tokens · listed by StepFun (China)
| Token type | Standard |
|---|---|
| Input | $0.10 |
| Output | $0.31 |
| Cache read | $0.02 |
Lowest input price across providers: $0.10.
Capabilities
ReasoningYes
Effort: low, high
Tool callYes
Structured outputYes
TemperatureYes
AttachmentsNo
Interleaved reasoningYes
Field: reasoning_content
Open weightsYes
ModeratedUnknown
Input
Text
Output
Text
Benchmarks
Published scores and Design Arena Elo
No published benchmark scores for this model yet.
Rankings
Position on each OneAtlas leaderboard
Providers · 6
6 listings
StepFun (China)
NanoGPT
EmpirioLabs AI
StepFun (Global)
StepFun Step Plan (China)
StepFun Step Plan (Global)| Provider | Model ID | Context | Input limit | Output | Input $ | Output $ | Reasoning $ | Cache read | Cache write | Audio in | Audio out | Reasoning | Tools | Structured | Temp. | Updated |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EmpirioLabs AI | step-3-5-flash-2603 | 256K | 256K | 131K | $0.10 | $0.30 | — | $0.02 | — | — | — | Yes | Yes | No | Yes | Apr 2, 2026 |
| NanoGPT | stepfun-ai/step-3.5-flash-2603 | 262K | 262K | 66K | $0.10 | $0.30 | — | $0.05 | — | — | — | Yes | No | No | Yes | Apr 2, 2026 |
| StepFun (China) | step-3.5-flash-2603 | 256K | 256K | 256K | $0.10 | $0.31 | — | $0.02 | — | — | — | Yes | Yes | Yes | Yes | Apr 2, 2026 |
| StepFun (Global) | step-3.5-flash-2603 | 256K | 256K | 256K | $0.10 | $0.30 | — | $0.02 | — | — | — | Yes | Yes | Yes | Yes | Apr 2, 2026 |
| StepFun Step Plan (China) | step-3.5-flash-2603 | 256K | 256K | 256K | — | — | — | — | — | — | — | Yes | Yes | Yes | Yes | Apr 2, 2026 |
| StepFun Step Plan (Global) | step-3.5-flash-2603 | 256K | 256K | 256K | — | — | — | — | — | — | — | Yes | Yes | Unknown | Yes | Apr 2, 2026 |