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StepFun: Step 3.7 Flash

stepfun/step-3.7-flash

Model weights
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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

Compare

About StepFun: Step 3.7 Flash

OpenRouter makes StepFun: Step 3.7 Flash available through a unified, OpenAI-compatible API using the model ID stepfun/step-3.7-flash. Requests can be routed across 3 providers, including StepFun, DeepInfra and NovitaAI, with automatic failover when an endpoint is unavailable.

StepFun: Step 3.7 Flash accepts text, images and video and returns text. It has a 262,144-token context window and a maximum output of 256,000 tokens.

On OpenRouter, StepFun: 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. Effective pricing can be lower when prompt caching applies. It was released on May 28, 2026.

More models from StepFun

  • Step 3.5 Flash

Frequently asked questions

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.

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.

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

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.

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

Step 3.7 Flash is served by 3 providers on OpenRouter: StepFun, DeepInfra and NovitaAI. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

Step 3.7 Flash was released on May 28, 2026.

ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQ

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 Exacto (highest tool-calling accuracy).

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.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

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.

Benchmarks

Scores on standardized evaluations. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

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.

Activity

Token volume and request traffic to this model over time.

Quick Start

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

$0.20$1.15$0.044.91s45 tps
90.75%
$0.20$1.15$0.040.11s91 tps
98.31%
$0.20$1.15$0.042.46s8 tps
96.98%

Throughput

91tok/s

P50, best across providers

Latency

0.11s

P50, best provider

Uptime (3d)

100.00%

Availability (3d)

99.56%

Availability over the last 3 days

Last 72 hours
Availability 99.56%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.11%
Without Routing
91.00%

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 customization options.

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