Catalog Changes · 2026-10-15 06:04:21.292110
StepFun: Step 5 Preview · 2026-10-15 06:04:21.292110 UTC
Current Model ListingKilo
26 Changed Fields
| Field / Array Position | Previous Value | Observed Value |
|---|---|---|
| Context Tokens | 1000000 | 1048576 |
| 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 |
| 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 |
StepFun: Step 5 Preview
stepfun/step-5-preview
Kilo Catalog ChangesLast Observed: 2026-10-15 06:04:21.292110 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...
- Context Tokens: 1048576
- Input Price (Native Units): 0.000001
- Output Price (Native Units): 0.0000027
- Output Token Limit: 64000
- Find Similar · At Least This Context And The Same Reported Modality
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 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 |
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
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 |