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StepFun (阶跃星辰)Open-weight·256K context·198B params·Apache-2.0

Step 3.7 Flashstepfun/step-3-7-flash

Step 3.7 Flash is an open-weight vision-language MoE model with 198B total parameters and about 11B active per token. It combines a 196B language backbone with a 1.8B vision encoder, supports a 256K context and offers low, medium and high reasoning settings.

Cheapest blended:$0.44 / 1M tokenson StepFun · 1 provider listed

Availability and billing notes

Reviewed September 21, 2026 · check the linked provider documentation for later changes.

Official source 1 →Official source 2 →

Pricing across providers

Sort by:
ProviderInput /1MOutput /1MBlended /1MLatency p50FormatFreshnessAction
StepFun
step-3.7-flash

International platform, USD.

$0.2
Cached $0.04
$1.15$0.438—OpenAI-compatiblePrice 1mo agoTry →

Affiliate disclosure: We may earn a commission from qualified signups. Pricing independence is enforced at the data layer — see our Editorial Independence Policy.

Works with

Point any of these clients at a hosting's base URL — they all speak at least one of this model's endpoint protocols (OPENAI_COMPATIBLE).

Capabilities

  • reasoning
  • code
  • vision
  • tool_calling

Code samples

Example using StepFun — the cheapest hosting for this model as of last verification. Swap base_url and model to use a different provider from the matrix above.

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.stepfun.ai/v1",
)

response = client.chat.completions.create(
    model="step-3.7-flash",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)

Technical specs

Context
256K
Max output
—
Parameters
198B
Release
—
Training cutoff
—
License
Apache-2.0
Hugging Face →Official documentation →

Similar models

Compare with

  • Step 3.7 Flash vs Qwen3.5-122B-A10B
    Comparison planned — not yet published
  • Step 3.7 Flash vs Qwen3.5-122B-A10B
    Comparison planned — not yet published

Frequently asked

How much does Step 3.7 Flash cost?+
The cheapest public hosting is $0.44 per 1M blended tokens on StepFun. 1 total providers are listed above with per-input / per-output / cached pricing.
Is Step 3.7 Flash open-source? Can I fine-tune it?+
Step 3.7 Flash has published weights. License: Apache-2.0. Review the linked repository and license for deployment, fine-tuning and commercial-use conditions.
Is Step 3.7 Flash OpenAI-compatible?+
At least one listed hosting exposes an OpenAI-compatible API, so you can point an existing openai SDK client at the Provider's base_url and use the Provider's model name. See the Code Samples above for a copy-pasteable example.
What's the maximum context window for Step 3.7 Flash?+
The model supports up to 256,000 tokens of context (input + output). Some hosted versions may impose a smaller limit — check the "Context" column in the pricing matrix for each provider.