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Model infoModelsSnapshot: 15 Oct 2026

StepFun / Step

Step-1o Turbo Vision

Image and video understanding model with a 32K context and text-only responses.

Language models (LLMs)
availableClosed weightsText generationVisionVideo understanding
Official documentation (opens in a new tab)Reviewed 12 Oct 2026
5 of 17 specification fields collected
Context window32KSee specification notes below
Maximum outputNot collectedAwaiting source review
Input billingSee ratesStepFun China
Output billingSee ratesPublished units and conditions below

Specifications

Provider-documented facts. “Not collected” means we have not verified that field yet, not that the feature is unsupported.

Context / input limit
32KSource for Context / input limit (opens in a new tab)
Maximum output
Not collected
Input modalities
Text, Image, VideoSource for Input modalities (opens in a new tab)
Output modalities
TextSource for Output modalities (opens in a new tab)
Reasoning
Not collected
Tool calling
Not collected
Structured output
Not collected
Streaming
Not collected
Batch processing
Not collected
Fine-tuning
Not collected
Knowledge cutoff
Not collected
Release date
Not collected
Parameters
Not collected
Architecture
Not collected
Languages
Not collected
Context caching
SupportedSource for Context caching (opens in a new tab)

The regional pricing table explicitly publishes cached-input rates.

Input image limits
Combined image payload under 20 MB; JPEG, PNG, static GIF or WebP. A side length at most 4096 pixels is recommended.Source for Input image limits (opens in a new tab)

Access & pricing

Prices belong to an endpoint and billing tier. A provider listing does not guarantee access for every account or region.

StepFun China

Provider source (opens in a new tab)
API model ID
step-1o-turbo-vision
Access
StepFun account and regional API key required. Documented availability, not a paid inference verification.
Regions
China platform (.com); deployment geography and data residency are not established by the hostname.
API endpoint URL
POST https://api.stepfun.com/v1/chat/completionsSource for API endpoint URL (opens in a new tab)

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 12 Oct 2026
CategoryUsageRateUnit
Text and vision tokensInput1CN¥2.501 million tokens
Text and vision tokensCached input1CN¥0.501 million tokens
Text and vision tokensOutput1CN¥8.001 million tokens

Rate conditions

  1. Regional pay-as-you-go rate as reviewed on 2026-10-12. Input, cached input and output are distinct charges; no currency conversion. Subscription allowances are separate.
Pricing source (opens in a new tab)

Data & enterprise terms

Retention, training use, regional processing and enterprise terms have not been summarized for this endpoint.

StepFun International

Provider source (opens in a new tab)
API model ID
step-1o-turbo-vision
Access
StepFun account and regional API key required. Documented availability, not a paid inference verification.
Regions
International platform (.ai); deployment geography and data residency require account-specific confirmation.
INPUT / 1M TOKENS$0.36
OUTPUT / 1M TOKENS$1.15

Regional pay-as-you-go rate as reviewed on 2026-10-12. Input, cached input and output are distinct charges; no currency conversion. Subscription allowances are separate. Cached input price: $0.07 / 1M tokens (base tier).

USD · observed 12 Oct 2026 · Pricing evidence (opens in a new tab)
Published billing units · original currency · observed 12 Oct 2026
CategoryUsageRateUnit
Text and vision tokensInput1$0.361 million tokens
Text and vision tokensCached input1$0.071 million tokens
Text and vision tokensOutput1$1.151 million tokens

Rate conditions

  1. Regional pay-as-you-go rate as reviewed on 2026-10-12. Input, cached input and output are distinct charges; no currency conversion. Subscription allowances are separate.
Pricing source (opens in a new tab)

Data & enterprise terms

Retention, training use, regional processing and enterprise terms have not been summarized for this endpoint.

Caching

Caching can reuse earlier input processing. Availability, lifetime and billing depend on the endpoint. A cache hit still generates a new response.

01 / INITIAL INPUTProcess & retain

The system processes eligible input and retains reusable state.

02 / LATER REQUESTCheck available state

Reuse depends on matching input, session state and the cache policy.

03 / CACHE HITReuse & generate

Reusing state can reduce repeated work. Any charges follow the billing rules below.

StepFun China

step-1o-turbo-vision
Documented
Support evidence (opens in a new tab)
How it works
Automatic matching prompt prefixesSource for How it works (opens in a new tab)
Minimum reusable input
256-token blocks; guide says automatic above 256 tokens and no hits below 256.Source for Minimum reusable input (opens in a new tab)
Lifetime & refresh
LRU eviction; lifetime varies with traffic. No fixed TTL is promised.Source for Lifetime & refresh (opens in a new tab)
How to enable it
Keep repeated content at the start of the prompt; identical images, videos and tool history can participate.Source for How to enable it (opens in a new tab)
Usage fields
response.usage.cached_tokensSource for Usage fields (opens in a new tab)
Billing rules
Cache-miss input includes writing to cache; hits use the model’s cached-input rate.Source for Billing rules (opens in a new tab)
Limits & data boundaries
No manual cache clearing or guaranteed cache hits.Source for Limits & data boundaries (opens in a new tab)
Cache reads, writes & storage
ChargeApplies toRate / unit
Cached input1Text and vision tokensCN¥0.50 / 1 million tokensPricing evidence (opens in a new tab)

Rate conditions

  1. Regional pay-as-you-go rate as reviewed on 2026-10-12. Input, cached input and output are distinct charges; no currency conversion. Subscription allowances are separate.

Observed 12 Oct 2026. Write rates and storage fees are different charges; use the billing rules above.

Caching reviewed 12 Oct 2026

StepFun International

step-1o-turbo-vision
Documented
Support evidence (opens in a new tab)
How it works
Automatic matching prompt prefixesSource for How it works (opens in a new tab)
Minimum reusable input
256-token blocks; guide says automatic above 256 tokens and no hits below 256.Source for Minimum reusable input (opens in a new tab)
Lifetime & refresh
LRU eviction; lifetime varies with traffic. No fixed TTL is promised.Source for Lifetime & refresh (opens in a new tab)
How to enable it
Keep repeated content at the start of the prompt; identical images, videos and tool history can participate.Source for How to enable it (opens in a new tab)
Usage fields
response.usage.cached_tokensSource for Usage fields (opens in a new tab)
Billing rules
Cache-miss input includes writing to cache; hits use the model’s cached-input rate.Source for Billing rules (opens in a new tab)
Limits & data boundaries
No manual cache clearing or guaranteed cache hits.Source for Limits & data boundaries (opens in a new tab)
Cache reads, writes & storage
ChargeApplies toRate / unit
Cache read1Text tokens · Base tier$0.07 / 1M tokensPricing evidence (opens in a new tab)
Cached input1Text and vision tokens$0.07 / 1 million tokensPricing evidence (opens in a new tab)

Rate conditions

  1. Regional pay-as-you-go rate as reviewed on 2026-10-12. Input, cached input and output are distinct charges; no currency conversion. Subscription allowances are separate.

Observed 12 Oct 2026. Write rates and storage fees are different charges; use the billing rules above.

Caching reviewed 12 Oct 2026

What the measurements say

No benchmark observations have been added for this model. We do not turn a vendor description into a performance score.

Latency and throughput depend on the host, request size, reasoning settings and load. There is no measured speed or global usage figure in this record.

The record behind the model

Why it is included

Inferred for this named native commercial service from official model/API documentation and comparison with StepFun’s public model repositories. No release of weights for this exact named service was found in the reviewed inventory. Public Step 3/3.5/3.7, Step-Audio Mini/R1/R1.1, Step1X and StepVideo releases are excluded; this does not assert that every StepFun model is closed.

Classification evidence (opens in a new tab)

Sources reviewed