Claude Fable 5.1 (High)vsFLUX.2 Klein 4B

Claude Fable 5.1 (High) is tied with FLUX.2 Klein 4B on the Podium Score (86.5).Category wins: Claude Fable 5.1 (High) 3 — 1 FLUX.2 Klein 4B.FLUX.2 Klein 4B is the cheaper pick ($0.01/M vs $15/M per 1M output tokens). Claude Fable 5.1 (High) is faster (92 t/s vs 90 t/s).

Open in Compare Tool →View Claude Fable 5.1 (High)View FLUX.2 Klein 4B
Claude Fable 5.1 (High)Drag 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
Claude Fable 5.1 (High)
86.5
Coding: 88.0 · Speed: 92 t/s
Output Price: $15/M
Quick VerdictAggregated 2026 Benchmark Analysis

Claude Fable 5.1 (High) is rated higher overall with a Podium Score of 86.5 (vs 86.5 for FLUX.2 Klein 4B). In head-to-head domain evaluations, Claude Fable 5.1 (High) outperforms in 3 of 7 benchmark categories.

Coding & Engineering
Claude Fable 5.1 (High) (88.0)
Inference Speed
Claude Fable 5.1 (High) (92 t/s)
Cost Efficiency
FLUX.2 Klein 4B ($0.01/M)
API Price / 1M (in · out)
Claude Fable 5.1 (High) $3/M · $15/M — FLUX.2 Klein 4B $0.01/M · $0.01/M

Choose Claude Fable 5.1 (High) for coding and software engineering, and FLUX.2 Klein 4B for vision and multimodal apps.

MetricClaude Fable 5.1 (High)FLUX.2 Klein 4B
Podium Score86.586.5
Arena Elo—1380
Intelligence Index—87.0
Coding88.0 ▲0.0
Math—0.0
Reasoning85.0 ▲25.0
Agentic—18.0
Knowledge45.0 ▲42.0
Multimodal30.090.0 ▲
Long-context—35.0
Output speed92 t/s ▲90 t/s
Output price$15/M$0.01/M ▲
Context window500K ▲32K
Scores aggregated from five independent leaderboards. See Methodology. More head-to-heads: Claude Fable 5.1 (High) vs Claude Mythos · Claude Fable 5.1 (High) vs Claude 5.5 Sonnet · Claude Fable 5.1 (High) vs Kimi K3.1 Pro · Claude Fable 5.1 (High) vs Eleven Multilingual v3
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