FLUX.2 Klein 9BvsFLUX.2 Klein 4B

FLUX.2 Klein 9B leads the overall Podium Score by 1.7 points (88.2 vs 86.5).Category wins: FLUX.2 Klein 9B 5 — 0 FLUX.2 Klein 4B.FLUX.2 Klein 4B is the cheaper pick ($0.01/M vs $0.02/M per 1M output tokens). FLUX.2 Klein 4B is faster (90 t/s vs 55 t/s).

Open in Compare Tool →View FLUX.2 Klein 9BView FLUX.2 Klein 4B
FLUX.2 Klein 9BDrag slider or hover to compareFLUX.2 Klein 4B
FLUX.2 Klein 4B
86.5
Coding: 0.0 · Speed: 90 t/s
Output Price: $0.01/M
FLUX.2 Klein 9B
88.2
Coding: 0.0 · Speed: 55 t/s
Output Price: $0.02/M
Quick VerdictAggregated 2026 Benchmark Analysis

FLUX.2 Klein 9B is rated higher overall with a Podium Score of 88.2 (vs 86.5 for FLUX.2 Klein 4B). In head-to-head domain evaluations, FLUX.2 Klein 9B outperforms in 5 of 7 benchmark categories.

Coding & Engineering
FLUX.2 Klein 9B (0.0)
Inference Speed
FLUX.2 Klein 4B (90 t/s)
Cost Efficiency
FLUX.2 Klein 4B ($0.01/M)
API Price / 1M (in · out)
FLUX.2 Klein 9B $0.02/M · $0.02/M — FLUX.2 Klein 4B $0.01/M · $0.01/M

Choose FLUX.2 Klein 9B for vision and multimodal apps, and FLUX.2 Klein 4B for cost-sensitive workloads.

MetricFLUX.2 Klein 9BFLUX.2 Klein 4B
Podium Score88.2 ▲86.5
Arena Elo1405 ▲1380
Intelligence Index88.0 ▲87.0
Coding0.00.0
Math0.00.0
Reasoning32.0 ▲25.0
Agentic22.0 ▲18.0
Knowledge50.0 ▲42.0
Multimodal94.0 ▲90.0
Long-context45.0 ▲35.0
Output speed55 t/s90 t/s ▲
Output price$0.02/M$0.01/M ▲
Context window64K ▲32K
Scores aggregated from five independent leaderboards. See Methodology. More head-to-heads: FLUX.2 Klein 9B vs Claude Mythos · FLUX.2 Klein 9B vs Claude 5.5 Sonnet · FLUX.2 Klein 9B vs Kimi K3.1 Pro · FLUX.2 Klein 9B vs Eleven Multilingual v3
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