Models4in catalog
Largest context1MStep 5 Preview
Avg context
444K
Cheapest input
$0.100/M
Step 3.5 Flash
Largest output
256K
Step 3.5 Flash (free)
Speed tiers
balanced 1fast 3
Capabilities
What Stepfun models support across the catalog.
Vision
2 / 4
50% of models
Tool use
4 / 4
100% of models
Function calling
4 / 4
100% of models
Extended thinking
4 / 4
100% of models
Streaming
4 / 4
100% of models
Prompt caching
2 / 4
50% of models
All Stepfun models
Sorted by context window, largest first. Tap a row for full specs.
| Model | Context | Max output | Input $/M | Speed |
|---|---|---|---|---|
| Step 5 Preview | 1M | 64K | $1.00/M | balanced |
| Step 3.5 Flash | 262K | 66K | $0.100/M | fast |
| Step 3.5 Flash (free) | 256K | 256K | — | fast |
| Step 3.7 Flash | 256K | 256K | $0.200/M | fast |
See rankings
How Stepfun models rank against the full catalog.