StepFun: Step 5 Preview (free)

stepfun/step-5-preview-free

Last Observed: 2026-10-15 06:04:20.758143 UTC

Step 5 Preview is StepFun's flagship model for agentic work, with strong capabilities in software engineering, professional knowledge work, and finance. It natively supports text, image, and video input with a 1M-token context window and up to 64K output tokens. The model supports tool calling, structured outputs, and selectable reasoning levels (low/medium/high) for long-context research, coding, and multi-step workflows.

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Architecture And Modalities · 3

Architecture · Instruct Type API Details /architecture/instruct_type Explicit Null	Explicit Null
Architecture · Modality API Details /architecture/modality text+image->text	text+image->text
Architecture · Tokenizer API Details /architecture/tokenizer Other	Other

Catalog Identity And Metadata · 15

Canonical Slug API Details /canonical_slug stepfun/step-5-preview-free	stepfun/step-5-preview-free
Context Tokens API Details /context_length 1000000	1,000,000
Created API Details /created 1756238927	2025-08-26 20:08:47 UTC
Description API Details /description Step 5 Preview is StepFun's flagship model for agentic work, with strong capabilities in software engineering, professional knowledge work, and finance. It natively supports text, image, and video input with a 1M-token context window and up to 64K output tokens. The model supports tool calling, structured outputs, and selectable reasoning levels (low/medium/high) for long-context research, coding, and multi-step workflows.	Step 5 Preview is StepFun's flagship model for agentic work, with strong capabilities in software engineering, professional knowledge work, and finance. It natively supports text,… Step 5 Preview is StepFun's flagship model for agentic work, with strong capabilities in software engineering, professional knowledge work, and finance. It natively supports text, image, and video input with a 1M-token context window and up to 64K output tokens. The model supports tool calling, structured outputs, and selectable reasoning levels (low/medium/high) for long-context research, coding, and multi-step workflows.
Hugging Face Id API Details /hugging_face_id Empty String	Empty String
Id API Details /id stepfun/step-5-preview-free	stepfun/step-5-preview-free
Is Free API Details /isFree True	True
May Train On Your Prompts API Details /mayTrainOnYourPrompts True	True
Name API Details /name StepFun: Step 5 Preview (free)	StepFun: Step 5 Preview (free)
Opencode · Variants · High · Reasoning · Effort API Details /opencode/variants/high/reasoning/effort high	high
Opencode · Variants · High · Reasoning · Enabled API Details /opencode/variants/high/reasoning/enabled True	True
Opencode · Variants · Low · Reasoning · Effort API Details /opencode/variants/low/reasoning/effort low	low
Opencode · Variants · Low · Reasoning · Enabled API Details /opencode/variants/low/reasoning/enabled True	True
Opencode · Variants · Medium · Reasoning · Effort API Details /opencode/variants/medium/reasoning/effort medium	medium
Opencode · Variants · Medium · Reasoning · Enabled API Details /opencode/variants/medium/reasoning/enabled True	True

Request Limits · 1

Per Request Limits API Details /per_request_limits Explicit Null	Explicit Null

Pricing · 7

Output Price · USD/Token API Details /pricing/completion 0.000000000000	0.000000000000
Pricing · Image API Details /pricing/image 0	0
Pricing · Input Cache Read API Details /pricing/input_cache_read 0.000000000000	0.000000000000
Pricing · Internal Reasoning API Details /pricing/internal_reasoning 0	0
Input Price · USD/Token API Details /pricing/prompt 0.000000000000	0.000000000000
Pricing · Request API Details /pricing/request 0	0
Pricing · Web Search API Details /pricing/web_search 0	0

Provider Limits · 3

Top Provider · Context Length API Details /top_provider/context_length 1000000	1,000,000
Top Provider · Is Moderated API Details /top_provider/is_moderated False	False
Top Provider · Max Completion Tokens API Details /top_provider/max_completion_tokens 64000	64,000

API Structure And Container Types

Architecture API Details /architecture Object · See Fields	Object · See Fields
Architecture · Input Modalities API Details /architecture/input_modalities Array · See Items	Array · See Items
Architecture · Output Modalities API Details /architecture/output_modalities Array · See Items	Array · See Items
Default Parameters API Details /default_parameters Object · See Fields	Object · See Fields
Opencode API Details /opencode Object · See Fields	Object · See Fields
Opencode · Variants API Details /opencode/variants Object · See Fields	Object · See Fields
Opencode · Variants · High API Details /opencode/variants/high Object · See Fields	Object · See Fields
Opencode · Variants · High · Reasoning API Details /opencode/variants/high/reasoning Object · See Fields	Object · See Fields
Opencode · Variants · Low API Details /opencode/variants/low Object · See Fields	Object · See Fields
Opencode · Variants · Low · Reasoning API Details /opencode/variants/low/reasoning Object · See Fields	Object · See Fields
Opencode · Variants · Medium API Details /opencode/variants/medium Object · See Fields	Object · See Fields
Opencode · Variants · Medium · Reasoning API Details /opencode/variants/medium/reasoning Object · See Fields	Object · See Fields
Pricing API Details /pricing Object · See Fields	Object · See Fields
Supported Parameters API Details /supported_parameters Array · See Items	Array · See Items
Top Provider API Details /top_provider Object · See Fields	Object · See Fields

Architecture · Input Modalities

2 items · source order preserved

text
image

API Details

Item	/architecture/input_modalities/*
1	text
2	image

Architecture · Output Modalities

1 items · source order preserved

text

API Details

Item	/architecture/output_modalities/*
1	text

Supported Parameters

5 items · source order preserved

max_tokens
temperature
tools
reasoning
include_reasoning

API Details

Item	/supported_parameters/*
1	max_tokens
2	temperature
3	tools
4	reasoning
5	include_reasoning

Recorded Value History

Historical API Field

Input Price · USD/Token

2 of 2 records plotted · 0 excluded for missing or invalid coordinates.

Up to 100 recorded versions, spaced by observation order rather than elapsed time. Array fields use the minimum numeric item in each version. Missing values are omitted. Select a point to open its archived snapshot; comparison actions use the current listing. History begins at the first recorded baseline.

Axis Scale

Select a point to open its listing or add it to compare.

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