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Kimi K3.1 Pro vs Claude Sonnet 5.5
Kimi K3.1 Pro vs Claude Sonnet 5.5: Capability, Speed & Real Cost Comparison (2026)
Open-Weight vs Proprietary Coding Benchmark: Kimi K3.1 Pro vs Claude Sonnet 5.5
Bottom Line: Pick Kimi K3.1 Pro for maximum capability (94 vs 93); pick Claude Sonnet 5.5 for lower token spend ($2 in / $10 out per 1M); Claude Sonnet 5.5 leads in generation speed (~138 TPS).
| Dimension | Kimi K3.1 Pro | Claude Sonnet 5.5 |
|---|---|---|
| Release Date | 2026-10-23 | 2026-09-28 |
| A · Overall Capability | 94/100 | 93/100 |
| 💻 Coding & Agents | 94/100 | 95/100 |
| ✍️ Writing & Copywriting | 94/100 | 87/100 |
| 📚 Long-Doc & Knowledge Base | 97/100 | 88/100 |
| 👁️ Vision & Multimodal | 93/100 | 94/100 |
| F · Generation Speed | 43 Token/s (77/100) | 138 Token/s (89/100) |
| R · Access & CN Grade | A | B |
| Input / Output ($/1M) | $1.9437 / $10.1671 | $2 / $10 |
| Cache Read Price ($/1M) | $0.1944 | $0.1 |
| Context Window | 1M | 1M |
OVERLAID F.A.R.E. RADAR CHART
■ Kimi K3.1 Pro
■ Claude Sonnet 5.5
Ideal Use Cases for Kimi K3.1 Pro
Choose Kimi K3.1 Pro when: Top-tier empirical capability score (94 index) and its channel pricing ($2/M input) fits your budget.
Ideal Use Cases for Claude Sonnet 5.5
Choose Claude Sonnet 5.5 when: Top-tier empirical capability score (93 index) or better cost efficiency for your workload.