StepFun: Step 3.5 Flash, Other — route, pricing & source
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
OpenRoutermediumLast checked: Jun 2, 2026
Input
$0.0900 / 1M
/ 1M tokens
Output
$0.3000 / 1M
/ 1M tokens
Cached input
Not available
Not available
Cache write
Not available
Not available
Context and limits
Context window
262.1K
Max output
16,384
Input modalities
text
Output modalities
text
Weight access
Unknown
Availability
Unknown
Capability flags
ToolsJSONReasoningLong context
From source metadata + verification fields — confirm provider docs before production.
Benchmarks
No safely merged benchmark result for this model yet.
Access and license
Official API
No
Open weights
No
Self-hostable
No
License
Unknown
Example costs
Scenario: 1K input + 300 output tokens / request
10,000 requests
$1.80
100,000 requests
$18.00
1,000,000 requests
$180.00
Cheaper alternatives
Lower-cost models for the same scenario
