Black Forest Labs: FLUX.2 Klein 4B

black-forest-labs/flux.2-klein-4b

Last Observed: 2026-10-15 06:03:58.895674 UTC

FLUX.2 [klein] 4B is the fastest and most cost-effective model in the FLUX.2 family, optimized for high-throughput use cases while maintaining excellent image quality. Pricing is based on the output...

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

Catalog Identity And Metadata · 11

Canonical Slug API Details /canonical_slug black-forest-labs/flux.2-klein-4b	black-forest-labs/flux.2-klein-4b
Context Tokens API Details /context_length 40960	40,960
Created API Details /created 1768429228	2026-01-14 22:20:28 UTC
Description API Details /description FLUX.2 [klein] 4B is the fastest and most cost-effective model in the FLUX.2 family, optimized for high-throughput use cases while maintaining excellent image quality. Pricing is based on the output...	FLUX.2 [klein] 4B is the fastest and most cost-effective model in the FLUX.2 family, optimized for high-throughput use cases while maintaining excellent image quality. Pricing is based on the output...
Expiration Date API Details /expiration_date Explicit Null	Explicit Null
Hugging Face Id API Details /hugging_face_id black-forest-labs/FLUX.2-klein-4B	black-forest-labs/FLUX.2-klein-4B
Id API Details /id black-forest-labs/flux.2-klein-4b	black-forest-labs/flux.2-klein-4b
Knowledge Cutoff API Details /knowledge_cutoff Explicit Null	Explicit Null
Links · Details API Details /links/details /api/v1/models/black-forest-labs/flux.2-klein-4b/endpoints	/api/v1/models/black-forest-labs/flux.2-klein-4b/endpoints
Name API Details /name Black Forest Labs: FLUX.2 Klein 4B	Black Forest Labs: FLUX.2 Klein 4B
Supported Voices API Details /supported_voices Explicit Null	Explicit Null

Default Parameters · 3

Default Parameters · Frequency Penalty API Details /default_parameters/frequency_penalty Explicit Null	Explicit Null
Default Parameters · Temperature API Details /default_parameters/temperature 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	0
Pricing · Image Output API Details /pricing/image_output 0.00000341796875	0.00000341796875
Input Price · USD/Token API Details /pricing/prompt 0	0

Provider Limits · 3

Top Provider · Context Length API Details /top_provider/context_length 40960	40,960
Top Provider · Is Moderated API Details /top_provider/is_moderated False	False
Top Provider · Max Completion Tokens API Details /top_provider/max_completion_tokens 36864	36,864

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 · 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
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

image

API Details

Item	/architecture/output_modalities/*
1	image

Supported Parameters

1 items · source order preserved

seed

API Details

Item	/supported_parameters/*
1	seed

Benchmarks · Design Arena

4 items · source order preserved

Item	Arena	Category	Elo	Rank	Win Rate
1	models	graphicdesign	1005	12	35.7
2	models	image	1063	12	38.8
3	models	logo	1059	12	37.9
4	models	imageediting	1055	8	38.9

API Details

Item	/benchmarks/design_arena/*/arena	/benchmarks/design_arena/*/category	/benchmarks/design_arena/*/elo	/benchmarks/design_arena/*/rank	/benchmarks/design_arena/*/win_rate
1	models	graphicdesign	1005	12	35.7
2	models	image	1063	12	38.8
3	models	logo	1059	12	37.9
4	models	imageediting	1055	8	38.9

Recorded Value History

Historical API Field

Input Price · USD/Token

3 of 3 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

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