Catalog Changes · 2026-10-15 06:04:01.144303

StepFun: Step 5 Preview · 2026-10-15 06:04:01.144303 UTC

OpenRouter

33 Changed Fields

Field / Array Position	Previous Value	Observed Value
Context Tokens	1000000	1048576
Hugging Face Id	Explicit Null	stepfun-ai/Step-5-Preview
Supported Parameters[10]	tools	response_format
Supported Parameters[11]	top_logprobs	seed
Supported Parameters[12]	top_p	stop
Supported Parameters[2]	logprobs	logit_bias
Supported Parameters[3]	max_tokens	logprobs
Supported Parameters[4]	reasoning	max_tokens
Supported Parameters[5]	reasoning_effort	min_p
Supported Parameters[6]	response_format	presence_penalty
Supported Parameters[7]	stop	reasoning
Supported Parameters[8]	structured_outputs	reasoning_effort
Supported Parameters[9]	temperature	repetition_penalty
Benchmarks	Not Reported	Object · See Fields
Benchmarks · Artificial Analysis	Not Reported	Object · See Fields
Benchmarks · Artificial Analysis · Agentic Index	Not Reported	Explicit Null
Benchmarks · Artificial Analysis · Coding Index	Not Reported	Explicit Null
Benchmarks · Artificial Analysis · Intelligence Index	Not Reported	43.7
Benchmarks · Design Arena	Not Reported	Array · See Items
Supported Parameters[13]	Not Reported	structured_outputs
Supported Parameters[13] · @item Type	Not Reported	1
Supported Parameters[14]	Not Reported	temperature
Supported Parameters[14] · @item Type	Not Reported	1
Supported Parameters[15]	Not Reported	tool_choice
Supported Parameters[15] · @item Type	Not Reported	1
Supported Parameters[16]	Not Reported	tools
Supported Parameters[16] · @item Type	Not Reported	1
Supported Parameters[17]	Not Reported	top_k
Supported Parameters[17] · @item Type	Not Reported	1
Supported Parameters[18]	Not Reported	top_logprobs
Supported Parameters[18] · @item Type	Not Reported	1
Supported Parameters[19]	Not Reported	top_p
Supported Parameters[19] · @item Type	Not Reported	1

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StepFun: Step 5 Preview

stepfun/step-5-preview

OpenRouter Catalog Changes

Last Observed: 2026-10-15 06:04:01.144303 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...

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

Benchmarks · 3

Benchmarks · Artificial Analysis · Agentic Index API Details /benchmarks/artificial_analysis/agentic_index Explicit Null	Explicit Null
Benchmarks · Artificial Analysis · Coding Index API Details /benchmarks/artificial_analysis/coding_index Explicit Null	Explicit Null
Benchmarks · Artificial Analysis · Intelligence Index API Details /benchmarks/artificial_analysis/intelligence_index 43.7	43.7

Catalog Identity And Metadata · 11

Canonical Slug API Details /canonical_slug stepfun/step-5-preview-20261008	stepfun/step-5-preview-20261008
Context Tokens API Details /context_length 1048576	1,048,576
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
Hugging Face Id API Details /hugging_face_id stepfun-ai/Step-5-Preview	stepfun-ai/Step-5-Preview
Id API Details /id stepfun/step-5-preview	stepfun/step-5-preview
Knowledge Cutoff API Details /knowledge_cutoff Explicit Null	Explicit Null
Links · Details API Details /links/details /api/v1/models/stepfun/step-5-preview-20261008/endpoints	/api/v1/models/stepfun/step-5-preview-20261008/endpoints
Name API Details /name StepFun: Step 5 Preview	StepFun: Step 5 Preview
Supported Voices API Details /supported_voices Explicit Null	Explicit Null

Default Parameters · 6

Default Parameters · Frequency Penalty API Details /default_parameters/frequency_penalty Explicit Null	Explicit Null
Default Parameters · Presence Penalty API Details /default_parameters/presence_penalty Explicit Null	Explicit Null
Default Parameters · Repetition Penalty API Details /default_parameters/repetition_penalty Explicit Null	Explicit Null
Default Parameters · Temperature API Details /default_parameters/temperature Explicit Null	Explicit Null
Default Parameters · Top K API Details /default_parameters/top_k Explicit Null	Explicit Null
Default Parameters · Top P API Details /default_parameters/top_p Explicit Null	Explicit Null

Request Limits · 1

Per Request Limits API Details /per_request_limits Explicit Null	Explicit Null

Pricing · 3

Output Price · USD/Token API Details /pricing/completion 0.0000027	0.0000027
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

Reasoning · 2

Reasoning · Default Effort API Details /reasoning/default_effort medium	medium
Reasoning · Mandatory API Details /reasoning/mandatory True	True

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
Benchmarks API Details /benchmarks Object · See Fields	Object · See Fields
Benchmarks · Artificial Analysis API Details /benchmarks/artificial_analysis Object · See Fields	Object · See Fields
Benchmarks · Design Arena API Details /benchmarks/design_arena Array · See Items	Array · See Items
Default Parameters API Details /default_parameters Object · See Fields	Object · See Fields
Links API Details /links Object · See Fields	Object · See Fields
Pricing API Details /pricing Object · See Fields	Object · See Fields
Reasoning API Details /reasoning Object · See Fields	Object · See Fields
Reasoning · Supported Efforts API Details /reasoning/supported_efforts Array · See Items	Array · See Items
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

20 items · source order preserved

frequency_penalty
include_reasoning
logit_bias
logprobs
max_tokens
min_p
presence_penalty
reasoning
reasoning_effort
repetition_penalty
response_format
seed
stop
structured_outputs
temperature
tool_choice
tools
top_k
top_logprobs
top_p

API Details

Item	/supported_parameters/*
1	frequency_penalty
2	include_reasoning
3	logit_bias
4	logprobs
5	max_tokens
6	min_p
7	presence_penalty
8	reasoning
9	reasoning_effort
10	repetition_penalty
11	response_format
12	seed
13	stop
14	structured_outputs
15	temperature
16	tool_choice
17	tools
18	top_k
19	top_logprobs
20	top_p

Benchmarks · Design Arena

0 items · source order preserved

Empty list

Reasoning · Supported Efforts

3 items · source order preserved

high
medium
low

API Details

Item	/reasoning/supported_efforts/*
1	high
2	medium
3	low