FLUX Klein 2 4B
FLUX Klein 2 4B is Black Forest Labs's image generation model. A compact 4B-parameter FLUX 2 model that unifies image generation and editing in a single fast model optimized for end-to-end inference.
| Specifications | |
|---|---|
black-forest-labs-flux-klein-2-4b | |
| Image Generation | |
| Active | |
| Black Forest Labs | |
| Text | |
| Image | |
| 4B | |
| 628 | |
| 244,192 | |
| 749,236 | |
| · 6 months ago | |
| Benchmarks | |
|---|---|
| Elo Rating | 1056#206 |
Capabilities
Input1/5
Text✓
Image·
Audio·
Video·
PDF·
Output1/5
Text·
Image✓
Audio·
Video·
Embedding·
Capabilities0/13
Reasoning·
Adaptive Reasoning·
Function Calling·
Parallel Function Calling·
Structured Outputs·
Native JSON Schema·
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching·
Assistant Prefill·
Pricing by Provider
US Dollar ($)
Per 1M tokens
| Provider | Standard | |
|---|---|---|
| Image In $ / 512 tile | Image Out $ / 512 tile | |
| $0.000059 per_step | $0.000287 per_step | |
Cost Calculator
US Dollar ($)
Preset:
Cheapest Instances to Run It
Cloud GPU instances that can host FLUX Klein 2 4B, ranked by cheapest on-demand price. The model needs about 10 GB of GPU memory at FP16 precision (estimated from its parameter count), so treat the fit as guidance rather than a guarantee.
All clouds
FP16 (full precision)
US Dollar ($)
Instance | Cloud | GPU | VRAM | Price | Cheapest region | |
|---|---|---|---|---|---|---|
| Standard_NV4as_v4 |  Azure | AMD Radeon Instinct MI25 | 16 GB | $0.233/hr | westus2 | |
| g5g.xlarge |  AWS | T4g | 16 GB | $0.420/hr | us-east-1 | |
| Standard_NV8as_v4 | Azure | AMD Radeon Instinct MI25 | 16 GB | $0.466/hr | westus2 | |
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| FLUX Klein 2 4B | — | — | — | Current | |
| FLUX Klein 2 9B | — | — | — | Available | |
| FLUX 2 Max | 67K | — | — | Available | |
| FLUX 2 Flex | — | — | — | Available | |
| FLUX 2 Dev | — | — | — | — | Available |
| FLUX 2 Dev Flash | — | — | — | — | Available |
| FLUX 2 Dev Turbo | — | — | — | — | Available |
| FLUX Klein 2 4B Base | — | — | — | — | Available |
| FLUX Klein 2 9B Base | — | — | — | — | Available |
| FLUX.1 Fill Pro | — | — | — | Available | |
| FLUX.1 Dev | — | 4K | $0.100 | $0.100 | Available |