Claude 5.5 SonnetvsFLUX.2 Klein 9B

Claude 5.5 Sonnet leads the overall Podium Score by 6.6 points (94.8 vs 88.2).Category wins: Claude 5.5 Sonnet 7 — 0 FLUX.2 Klein 9B.FLUX.2 Klein 9B is the cheaper pick ($0.02/M vs $15/M per 1M output tokens). Claude 5.5 Sonnet is faster (94 t/s vs 55 t/s).

Open in Compare Tool →View Claude 5.5 SonnetView FLUX.2 Klein 9B
Claude 5.5 SonnetDrag slider or hover to compareFLUX.2 Klein 9B
FLUX.2 Klein 9B
88.2
Coding: 0.0 · Speed: 55 t/s
Output Price: $0.02/M
Claude 5.5 Sonnet
94.8
Coding: 91.5 · Speed: 94 t/s
Output Price: $15/M
Quick VerdictAggregated 2026 Benchmark Analysis

Claude 5.5 Sonnet is rated higher overall with a Podium Score of 94.8 (vs 88.2 for FLUX.2 Klein 9B). In head-to-head domain evaluations, Claude 5.5 Sonnet outperforms in 7 of 7 benchmark categories.

Coding & Engineering
Claude 5.5 Sonnet (91.5)
Inference Speed
Claude 5.5 Sonnet (94 t/s)
Cost Efficiency
FLUX.2 Klein 9B ($0.02/M)
API Price / 1M (in · out)
Claude 5.5 Sonnet $3/M · $15/M — FLUX.2 Klein 9B $0.02/M · $0.02/M

Choose Claude 5.5 Sonnet for long documents and large codebases, and FLUX.2 Klein 9B for cost-sensitive workloads.

MetricClaude 5.5 SonnetFLUX.2 Klein 9B
Podium Score94.8 ▲88.2
Arena Elo1520 ▲1405
Intelligence Index95.0 ▲88.0
Coding91.5 ▲0.0
Math94.2 ▲0.0
Reasoning95.0 ▲32.0
Agentic89.4 ▲22.0
Knowledge88.0 ▲50.0
Multimodal96.0 ▲94.0
Long-context98.0 ▲45.0
Output speed94 t/s ▲55 t/s
Output price$15/M$0.02/M ▲
Context window1000K ▲64K
Scores aggregated from five independent leaderboards. See Methodology. More head-to-heads: Claude 5.5 Sonnet vs Claude Mythos · Claude 5.5 Sonnet vs Kimi K3.1 Pro · Claude 5.5 Sonnet vs Eleven Multilingual v3 · Claude 5.5 Sonnet vs FLUX.2 Pro
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