Home / All model prices / Stepfun / step-3-5-flash S Stepfun
step-3-5-flash OpenRouter price Model overview 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....
Context window 262,144 tokens
Knowledge cutoff —
Price last verified 2026-09-06
First observed 2026-08-11 Descriptions, capabilities, and tariffs come from the linked source. First-party prices take priority; OpenRouter fallbacks are labelled.
Current price Estimated API value in USD per million tokens, backed by OpenRouter's public Models API.
Input $0.1
Cached input —
Cache write 5m —
Cache write 1h —
Output $0.3 Capabilities and formats text frequency penalty include reasoning max tokens reasoning temperature tool choice tools top k top p Performance references No comparable benchmark data is currently available.
PRICE EVOLUTION Price history Original observation and every later change, including any change of price source.
Original observed price Official price unavailable 2026-08-11
Input: — Cached input: — Cache write 5m: — Cache write 1h: — Output: —
Price change OpenRouter price 2026-08-20
Input: $0.1 Cached input: — Cache write 5m: — Cache write 1h: — Output: $0.3
