Step-3.7-Flash

apache-2.0

Step 3.7 Flash is an open-source multimodal reasoning model by StepFun with 198B total parameters (11B active) using Mixture of Experts. It accepts text and image inputs and features a 256K context window, selectable reasoning effort, tool calling, and agentic capabilities for coding and search workflows, scoring 80.9% on GPQA Diamond and 56.3% on SWE-bench Pro.

Context
262K
Input price
$0.2/1M tokens
Output price
$1.15/1M tokens

Capabilities

Reasoning & Interaction
Tool Calling
Infrastructure
Streaming
Fine-tuning

Details

Model IDstepfun-ai/Step-3.7-Flash
Provider DeepInfra
Creator StepFun
Family—
Licenseapache-2.0
Statusactive
Typechat
Input modalitiestext, image
Output modalitiestext
Open weightYes
Parameters—
Architecture—
Context window262K tokens
Max input—
Max output—
Reasoning tokens—
Knowledge cutoff—
Release date—
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Endpoints

Chat CompletionsPOST
Generate chat responses with messageshttps://api.deepinfra.com/v1/openai/v1/chat/completions

Pricing

Input
$0.2
Output
$1.15
Cache write
—
Cache read
$0.04
Batch in
—
Batch out
—

API

GET/v1/models/deepinfra/stepfun-ai/Step-3.7-Flash

Step-3.7-Flash

stepfun-ai/Step-3.7-Flash

Step 3.7 Flash is an open-source multimodal reasoning model by StepFun with 198B total parameters (11B active) using Mixture of Experts. It accepts text and image inputs and features a 256K context window, selectable reasoning effort, tool calling, and agentic capabilities for coding and search workflows, scoring 80.9% on GPQA Diamond and 56.3% on SWE-bench Pro.

Changes · 2 entries
stepfun-ai/Step-3.7-Flashcreateca7a400Nov 2, 2026, 03:02 AM
stepfun-ai/Step-3.7-Flashcreateab879c8Jun 18, 2026, 08:32 AM