Black Forest Labs
·Released on Jan 14, 2026

FLUX.2 Klein 4B API Benchmarks, Pricing & Provider Data

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FLUX.2 Klein 4B API pricing covers undefined API provider} other undefined API providers}}, from $1.00/M to $1.00/M.

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.....

Cost
$1.00/ 1M · 8:1 in:out
$0.160 in · $0.840 out

Specifications

Input and output token limits for this model, plus how it ranks on long-context understanding.

INPUT
41.0Ktokens
49.2 pages of text
OUTPUT
36.9Ktokens
8K128K1M4M
41.0K

Technical Details

Input
Output
Total parameters
4B
Released
Jan 2026
Tokenizer
Other
Architecture
text+image->image
Moderated
No
Supported parameters
seed

OpenRouter endpoints

1 endpoints

Third-party OpenRouter endpoint data, shown separately from LMSpeed measurements. Some 30-minute live performance fields only appear after syncing with an OpenRouter API key.

Provider endpointInputOutput1d uptime30m latency30m throughputContext / output
Black Forest Labs
black-forest-labs
$0/M$0/M100%undefined tokens / undefined tokens

Pricing Comparison

FLUX.2 Klein 4B API pricing starts at $1.00/M from zeabur API.

ProviderHealthModel VariantGroupInput ($/M)Output ($/M)Speed (t/s)First tokenAudit
L1
98%
black-forest-labs/FLUX.2-klein-4B
国产模型
$1.00/M
$1.00/M

Alternatives & Similar Models

Frequently Asked Questions

What benchmark data does FLUX.2 Klein 4B include?
LMSpeed shows FLUX.2 Klein 4B benchmark context, API price, output speed, first-token latency, and provider data across 1 providers when those signals are available.
What is the FLUX.2 Klein 4B API price?
FLUX.2 Klein 4B has pricing from undefined provider} other undefined providers}}, ranging from $1.00/M to $1.00/M. zeabur API has the lowest listed price.
What does the FLUX.2 Klein 4B API pricing table include?
The FLUX.2 Klein 4B API pricing table compares 1 providers by input price, output price, free tier status, speed, first-token latency, and recent health data when available.
Which provider has the cheapest FLUX.2 Klein 4B API pricing?
zeabur API currently has the lowest listed FLUX.2 Klein 4B price at $1.00/M across undefined provider} other undefined providers}}.
Is FLUX.2 Klein 4B API free?
FLUX.2 Klein 4B does not currently have a free API tier on LMSpeed. All 1 providers charge per token.

Also known as

black-forest-labs/FLUX.2-klein-4Bblack-forest-labs/flux.2-klein-4bflux-2-klein-4b

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.Standard benchmark data may include BenchLM and other public sources.

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View API Documentation