Claude 5.5 SonnetvsKimi K3.1 Pro

Claude 5.5 Sonnet leads the overall Podium Score by 0.6 points (94.8 vs 94.2).Category wins: Claude 5.5 Sonnet 3 — 3 Kimi K3.1 Pro.Claude 5.5 Sonnet is the cheaper pick ($15/M vs $20/M per 1M output tokens). Claude 5.5 Sonnet is faster (94 t/s vs 45 t/s).

Open in Compare Tool →View Claude 5.5 SonnetView Kimi K3.1 Pro
Claude 5.5 SonnetDrag slider or hover to compareKimi K3.1 Pro
Kimi K3.1 Pro
94.2
Coding: 72.0 · Speed: 45 t/s
Output Price: $20/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 94.2 for Kimi K3.1 Pro). Both models show closely matched capabilities across domain benchmarks.

Coding & Engineering
Claude 5.5 Sonnet (91.5)
Inference Speed
Claude 5.5 Sonnet (94 t/s)
Cost Efficiency
Claude 5.5 Sonnet ($15/M)
API Price / 1M (in · out)
Claude 5.5 Sonnet $3/M · $15/M — Kimi K3.1 Pro $4/M · $20/M

Choose Claude 5.5 Sonnet for coding and software engineering, and Kimi K3.1 Pro for long documents and large codebases.

MetricClaude 5.5 SonnetKimi K3.1 Pro
Podium Score94.8 ▲94.2
Arena Elo1520 ▲1490
Intelligence Index95.0 ▲68.0
Coding91.5 ▲72.0
Math94.295.0 ▲
Reasoning95.098.0 ▲
Agentic89.4 ▲82.0
Knowledge88.0 ▲45.0
Multimodal96.096.0
Long-context98.0100.0 ▲
Output speed94 t/s ▲45 t/s
Output price$15/M ▲$20/M
Context window1000K1000K
Scores aggregated from five independent leaderboards. See Methodology. More head-to-heads: Claude 5.5 Sonnet vs Claude Mythos · Claude 5.5 Sonnet vs Eleven Multilingual v3 · Claude 5.5 Sonnet vs FLUX.2 Pro · Claude 5.5 Sonnet vs Gemini 4 Argon
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