StepFun's multimodal reasoning preview model with a 1M-token context window, structured output, and function calling.
LLM Gateway routes requests to the best providers that are able to handle your prompt size and parameters.
StepFun's multimodal reasoning preview model with a 1M-token context window, structured output, and function calling. You can access it through LLM Gateway's OpenAI-compatible API with automatic provider routing, fallback, and cost analytics.
Pricing for Step 5 Preview on LLM Gateway starts at $1.00 per million input tokens and $2.70 per million output tokens, depending on the provider. The pricing table above always reflects the current per-provider rates.
Step 5 Preview supports a context window of up to 1,000,000 tokens on its largest provider deployment.
Step 5 Preview is served by Tencent Cloud through LLM Gateway. Requests are automatically routed to the best available provider, with fallback when a provider has issues.
Yes. Step 5 Preview supports both tool (function) calling and strict JSON output schema (upstream-enforced) through LLM Gateway.
Step 5 Preview was released on September 23, 2026.