FLUX.2 [klein] 4B
Black Forest LabsOpenApache 2.0
FLUX.2 [klein] 4B is an AI image model from Black Forest Labs. On LMArena’s Text-to-image leaderboard it ranks 70 of 82 with 1030±3 from 152,389 votes. On LMArena’s Image editing leaderboard it ranks 50 of 60 with 1187±3 from 541,237 votes. License: Apache 2.0.
Key figures
- Developer
- Black Forest Labs
- License
- Apache 2.0
- Released (per AA)
- Jan 2026
Who it is for (from the data)
- When quality is not the top priority: #70 of 82 on Text-to-image, in the bottom half; if quality matters most, check higher-ranked models first.
- Generating and editing images: it is ranked on both boards.
- Self-hosting or on-premise use: LMArena lists its license as Apache 2.0.
- Existing Black Forest Labs users: this vendor has 11 models on Text-to-image.
Neighbours on Text-to-image
| # | Model | Score | Votes | AA Elo | License | Δ |
|---|---|---|---|---|---|---|
| 67 |  Ideogram V3 Quality Ideogram | 1048 | 118,538 | – | Proprietary | +18 |
| 68 |  Photon Luma AI | 1036 | 130,160 | – | Proprietary | +6 |
| 69 | ?P Image | 1033 | 109,762 | 900 | Proprietary | +3 |
| 70 | FLUX 2 Klein 4B Black Forest Labs | 1030 | 152,389 | – | Apache 2.0 | |
| 71 |  Runway Gen-4 Runway | 1024 | 54,361 | – | Proprietary | -6 |
| 72 |  Recraft V3 Recraft | 1021 | 195,627 | – | Proprietary | -9 |
| 73 | FLUX 1.1 Pro Black Forest Labs | 1016 | 70,460 | – | Proprietary | -14 |
Alternatives · More from Black Forest Labs
| # | Model | Score | Votes | AA Elo | License |
|---|---|---|---|---|---|
| 29 | FLUX 2 Max Black Forest Labs | 1162 | 123,203 | – | Proprietary |
| 30 | FLUX 2 Flex Black Forest Labs | 1157 | 156,923 | – | Proprietary |
| 32 | FLUX 2 Pro Black Forest Labs | 1153 | 212,359 | – | Proprietary |
| 38 | FLUX 2 Dev Black Forest Labs | 1146 | 77,988 | – | flux-non-commercial-license |
| 61 | FLUX 1 Kontext Max Black Forest Labs | 1074 | 65,510 | – | Proprietary |
Alternatives · Top open-weight models
| # | Model | Score | Votes | AA Elo | License |
|---|---|---|---|---|---|
| 19 |  Qwen Image 2.1 Alibaba | 1223 | 11,441 | 1042 | qwen-research |
| 20 | Ideogram 4.0 Quality Ideogram | 1205 | 60,591 | – | Ideogram Open Model |
| 27 |  Cosmos3-Super-Text2Image (Agentic) NVIDIA | 1165 | 10,805 | – | OpenMDW-1.1 |
| 33 | Cosmos3-Super-Text2Image NVIDIA | 1152 | 18,485 | – | OpenMDW-1.1 |
| 35 |  Hunyuan Image 3.0 Tencent | 1150 | 180,518 | 989 | tencent-hunyuan-community |
How to read the scores
- LMArena score: people blind-pick the better of two anonymous images for the same prompt, and the votes are fitted into an Elo-style rating; "±" is the 95% confidence interval.
- Text-to-image and image edit are separate boards, so scores are not comparable across them; AA Elo comes from Artificial Analysis on a different scale.
- If the gap between two models is smaller than their combined intervals, the order is not statistically reliable; treat them as the same tier. More votes mean narrower intervals.
FAQ
Where does FLUX.2 [klein] 4B rank among AI image models?
Text-to-image rank 70 (1030); Image editing rank 50 (1187) (LMArena, data as of Oct 26, 2026).
Is FLUX.2 [klein] 4B open-weight?
LMArena lists its license as Apache 2.0 (not proprietary); check the license text for commercial-use terms.
Can FLUX.2 [klein] 4B edit images?
Yes. FLUX.2 [klein] 4B is #50 of 60 on the LMArena image-edit board (1187, 541,237 votes).
Who makes FLUX.2 [klein] 4B?
According to LMArena, FLUX.2 [klein] 4B is made by Black Forest Labs.
How reliable is FLUX.2 [klein] 4B's score?
The scores are based on 152,389 votes on Text-to-image (95% CI ±3); 541,237 votes on Image editing (95% CI ±3). More votes and narrower intervals mean a more stable rank.
How far is FLUX.2 [klein] 4B from #1 on Text-to-image?
#1 on Text-to-image is GPT Image 2.5 Sunburst (1425); FLUX.2 [klein] 4B scores 1030, 395 points behind.
Sources
LMArena Text-to-image data published on Oct 7, 2026.
LMArena Image editing data published on Oct 20, 2026.
17NAS syncs the upstream leaderboards daily; this page's data was synced on Oct 26, 2026.
Price, resolution and speed have no reliable public data yet and are omitted; all values come from the snapshot, blanks show –.