Catalog Changes · 2026-10-14 18:04:43.802104

Black Forest Labs: FLUX.2 Klein 4B · 2026-10-14 18:04:43.802104 UTC

OpenRouter

3 Changed Fields

Field / Array Position	Previous Value	Observed Value
Benchmarks · Design Arena[0] · Elo	1004	1005
Benchmarks · Design Arena[3] · Elo	1056	1055
Benchmarks · Design Arena[3] · Win Rate	39.2	38.9

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Black Forest Labs: FLUX.2 Klein 4B

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

OpenRouter Catalog Changes

Last Observed: 2026-10-15 06:04:06.402352 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