How much does Step 3.7 Flash cost?

Step 3.7 Flash costs $0.20/M input tokens and $1.15/M output tokens, with separate rates for Cache Read at $0.04/M tokens.

What is the context length of Step 3.7 Flash?

Step 3.7 Flash has a 262,144 token context window. It supports up to 256,000 completion tokens.

Does Step 3.7 Flash support tool calling and structured outputs?

Yes. Step 3.7 Flash accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

What inputs and outputs does Step 3.7 Flash support?

Step 3.7 Flash accepts text, images, and video as input and returns text.

Which providers serve Step 3.7 Flash?

Step 3.7 Flash is served by 2 providers on OpenRouter: NovitaAI and StepFun. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

When was Step 3.7 Flash released?

Step 3.7 Flash was released on May 28, 2026.

StepFun: Step 3.7 Flash

stepfun/step-3.7-flash

Model weights

Compare

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B parameters per token. The model supports a 256K context window and exposes selectable reasoning levels (high/medium/low), letting callers trade off speed, cost, and depth of reasoning.

Designed for coding, agentic workflows, structured outputs, and long-context productivity tasks.

Modalities

In / out price

$0.20 / $1.15per 1M

Context

262K

Released

May 28, 2026

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick: Balanced (price + speed), Nitro (fastest), or Floor (cheapest).

Latency / throughput


	$0.20	$1.15	$0.04	3.81s	69 tok/s	100.00%
	$0.20	$1.15	$0.04	3.57s	144 tok/s	100.00%

Input $0.20Output $1.15
69 tok/s100.00% uptime
Input $0.20Output $1.15
144 tok/s100.00% uptime

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Weighted average

Input

$0.08397/M tokens

Output

$1.15/M tokens

Step 3.7 Flash — Price history

Price history

No effective price data for this selection

		$0.0509	$1.15	93.2%	8.6%
		$0.0877	$1.15	70.2%	91.4%

Effective in $0.0509Effective out $1.15
Token share
8.6%
Effective in $0.0877Effective out $1.15
Token share
91.4%

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

100.00%

Availability (3d)

99.85%

Availability over the last 3 days

Last 72 hours

Availability 99.85%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

99.80%

Without Routing

99.73%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for StepFun: Step 3.7 Flash (Artificial Analysis and Design Arena)
Source	Benchmark	Score
Artificial Analysis	Step 3.7 Flash Coding Index	39.6
Artificial Analysis	Step 3.7 Flash GPQA Diamond	80.9%
Artificial Analysis	Step 3.7 Flash HLE	21.4%
Artificial Analysis	Step 3.7 Flash IFBench	67.3%
Artificial Analysis	Step 3.7 Flash τ²-Bench Telecom	98.5%
Artificial Analysis	Step 3.7 Flash AA-LCR	73.7%
Artificial Analysis	Step 3.7 Flash τ-Bench Banking	12.0%
Artificial Analysis	Step 3.7 Flash GDPval-AA	18.2%
Artificial Analysis	Step 3.7 Flash CritPt	2.3%
Artificial Analysis	Step 3.7 Flash SciCode	43.9%
Artificial Analysis	Step 3.7 Flash Terminal-Bench Hard	35.6%
Artificial Analysis	Step 3.7 Flash Terminal-Bench 2.1	39.3%
Design Arena	Step 3.7 Flash Models Arena 3D Elo	1108
Design Arena	Step 3.7 Flash Models Arena Asciiart Elo	1142
Design Arena	Step 3.7 Flash Models Arena Code Categories Elo	1169
Design Arena	Step 3.7 Flash Models Arena Data Visualization Elo	1171
Design Arena	Step 3.7 Flash Models Arena Game Development Elo	1142
Design Arena	Step 3.7 Flash Models Arena SVG Elo	1074
Design Arena	Step 3.7 Flash Models Arena UI Component Elo	1167
Design Arena	Step 3.7 Flash Models Arena Website Elo	1186

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Hermes Agent

Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.

824Btokens

Nous Research API

Nous Research is an AI research team focused on advancing open-source AI.

34.5Btokens

Vobi Agent

new

879Mtokens

Cline

Cline is an open-source AI coding agent that lives inside your IDE, autonomously exploring your codebase, editing files, running terminal commands, and using browser automation.

667Mtokens

Claude Code

Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.

118Mtokens

Top 5 Apps

81.8M

Rest of OpenRouter

2.09M

Not currently available through EU in-region routing. In-region routing docs

More models from stepfun

Step 5 Preview

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional knowledge work, with particular strength in finance.

It is designed for extended tasks that span large codebases and documents, using tools and refining results over multiple steps.

Text1M context$1 / $2.70

Step 3.5 Flash

Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token. It is a reasoning model that is incredibly speed efficient even at long contexts.

Text262K context$0.10 / $0.30

StepFun: Step 3.7 Flash

Providers