Step 3.5 Flash (step-3.5-flash) is a chat model from stepfun with a 256K-token context window; open-weight; capabilities tools, reasoning; input text; output text.
256KContext
256KMax output
$0.10461$ / 1M in
115.15tok / s
Pricing
Input
$0.10461 / 1M tokens
Output
$0.31384 / 1M tokens
Currency
USD
Note
Indicative US list price — verify with the vendor.
Indicative US list price — a reference only, verify with the vendor. Source: models-dev. Last verified 2026-10-30.
Performance
Throughput
115.15 tokens/s
Latency (TTFT)
3.31 s
Cited speed metrics — a reference, verify at the source. Source: Artificial Analysis. Last verified 2026-11-05.