Step 3.5 Flash
text->text
Step 3.5 Flash is a compact variant — chosen for high throughput and low cost rather than absolute capability. Available via stepfun. 262,144-token context. Budget pricing.
Step 3.5 Flash is a efficient AI model from stepfun. It costs $0.100 per million input tokens and $0.300 per million output tokens (blended $0.160/M), with a 262,144-token context window.
INPUT
$0.100/M
per million input tokens
OUTPUT
$0.300/M
per million output tokens
CONTEXT
262,144
tokens
What it is good at
- Sub-second latency
- Affordable at scale
- Good for routing & classification
Typical use cases
- Routing & classification
- Bulk summarisation
- Realtime chat UX
Benchmarks
No published benchmark scores tracked for this model yet. Frontier and reasoning models from major providers have scores; smaller models and inference-host variants typically inherit the underlying open-weights score.
More from stepfun
See all 1 →Frequently asked questions
How much does Step 3.5 Flash cost?
Step 3.5 Flash costs $0.100 per million input tokens and $0.300 per million output tokens, for a blended reference rate of $0.160 per million tokens.
What is Step 3.5 Flash's context window?
Step 3.5 Flash supports up to 262,144 tokens of context in a single request.
What is Step 3.5 Flash best for?
Step 3.5 Flash is well suited to Sub-second latency, Affordable at scale and Good for routing & classification.
Who makes Step 3.5 Flash?
Step 3.5 Flash is developed and served by stepfun.