Step 3.7 Flash

Step 3.7 Flash is a newer StepFun flash model designed for faster agents, coding, and multimodal prompts. It belongs to the step line, succeeding Step 3.5 Flash 2603. It has a context window of 256000 tokens and a max output of 256000 tokens. Weights are open. It supports reasoning mode and tool calling. It accepts image, text, and video inputs and returns text. Pricing starts at $0.185 per million input tokens and $1.11 per million output tokens, with cached input at $0.03 per million tokens.

Against Step 3.5 Flash 2603: input $0.10 to $0.185, output $0.30 to $1.11, cached input $0.02 to $0.03.

Range across the hosts that serve it: up to $0.22 per 1M input tokens.

• ·256k token context and output
• ·Reasoning mode and tool calling
• ·Accepts image, text, and video
• ·Open weights for self-hosting
• ·Served by 18 hosts

• Reach for it for building agentic workflows
• Reach for it for coding assistance
• Reach for it for multimodal prompts with images or video
• Reach for it for long-context tasks up to 256k tokens

18 hosts serve this model at the price above · the maker's documentation

• 8Artificial Analysis 评测 Step 5 Preview： Intelligence Index 得 44 分，成本约为同级模型 1/2.82026-09-22

1 signal of the archive mention this model, each scored against the published bar. This list is rebuilt from the archive at every build, so it cannot go stale.

The registry keeps the six most recent versions of a line. Older ones stay in the file and can be surfaced without a rebuild.

What is the context window?

256000 tokens input and output.

Does it support reasoning and tool calling?

Yes, it has reasoning mode and tool calling.

What are the input and output prices?

From $0.185 per million input tokens and $1.11 per million output tokens, with cached input from $0.03 per million.