Catalog Changes · 2026-10-13 03:21:30.349716

StepFun: Step 5 Preview (free) · 2026-10-13 03:21:30.349716 UTC

Current Model Listing

Kilo

First recorded baseline; no earlier history is available.

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StepFun: Step 5 Preview (free)

stepfun/step-5-preview-free

Kilo Catalog Changes

Last Observed: 2026-10-13 18:02:44.927920 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 · 16

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
Preferred Index API Details /preferredIndex 2	2

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