Catalog Changes · 2026-10-13 03:21:30.510778

StepFun: Step 5 Preview · 2026-10-13 03:21:30.510778 UTC

Current Model Listing

Kilo

First recorded baseline; no earlier history is available.

← Back To Results

StepFun: Step 5 Preview

stepfun/step-5-preview

Kilo Catalog Changes

Last Observed: 2026-10-15 00:04:18.877207 UTC

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...

Find A Field

Architecture And Modalities · 2

Architecture · Modality API Details /architecture/modality text+image+video->text	text+image+video->text
Architecture · Tokenizer API Details /architecture/tokenizer Other	Other

Catalog Identity And Metadata · 14

Context Tokens API Details /context_length 1000000	1,000,000
Created API Details /created 1791462849	2026-10-08 12:34:09 UTC
Description API Details /description Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...	Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
Expiration Date API Details /expiration_date Explicit Null	Explicit Null
Id API Details /id stepfun/step-5-preview	stepfun/step-5-preview
Is Free API Details /isFree False	False
May Train On Your Prompts API Details /mayTrainOnYourPrompts False	False
Name API Details /name StepFun: Step 5 Preview	StepFun: Step 5 Preview
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 · 4

Output Price · USD/Token API Details /pricing/completion 0.0000027	0.0000027
Pricing · Discount API Details /pricing/discount 0	0
Pricing · Input Cache Read API Details /pricing/input_cache_read 0.00000005	0.00000005
Input Price · USD/Token API Details /pricing/prompt 0.000001	0.000001

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
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

3 items · source order preserved

text
image
video

API Details

Item	/architecture/input_modalities/*
1	text
2	image
3	video

Architecture · Output Modalities

1 items · source order preserved

text

API Details

Item	/architecture/output_modalities/*
1	text

Supported Parameters

13 items · source order preserved

frequency_penalty
include_reasoning
logprobs
max_tokens
reasoning
reasoning_effort
response_format
stop
structured_outputs
temperature
tools
top_logprobs
top_p

API Details

Item	/supported_parameters/*
1	frequency_penalty
2	include_reasoning
3	logprobs
4	max_tokens
5	reasoning
6	reasoning_effort
7	response_format
8	stop
9	structured_outputs
10	temperature
11	tools
12	top_logprobs
13	top_p