token.app › Compare › Claude Sonnet 4.5 vs Kimi K3
Claude Sonnet 4.5 vs Kimi K3
Kimi K3 leads on 5 of 5 shared benchmarks. Kimi K3 accepts the larger context window (1.0M).
Head to head
Blended price uses a 3:1 input:output mix
| Claude Sonnet 4.5 | Kimi K3 | |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Input $/1M | $3.00 | $3.00 |
| Output $/1M | $15.00 | $15.00 |
| Blended $/1M | $6.00 | $6.00 |
| Context window | 1M | 1.0M |
| Max output | 64K | — |
| Released | Sep 2025 | Jul 2026 |
| Licence | Proprietary | Open weights |
| GPQA Diamond | 82.3% | 93.1% |
| FrontierMath T1–3 | 23.9% | 72.2% |
| FrontierMath T4 | 2.4% | 39.0% |
| SimpleQA Verified | 23.6% | 42.7% |
| OTIS Mock AIME | 77.8% | 97.2% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Claude Sonnet 4.5 if…
- No clear advantage on the data we hold.
Choose Kimi K3 if…
- Higher GPQA Diamond (93.1% vs 82.3%)
- Higher FrontierMath T1–3 (72.2% vs 23.9%)
- Higher FrontierMath T4 (39.0% vs 2.4%)
- Higher SimpleQA Verified (42.7% vs 23.6%)
- Larger context window (1.0M)
- Open weights — self-hostable
- Newer model (released Jul 2026)
FAQ
Which is better, Claude Sonnet 4.5 or Kimi K3?
Across the 5 benchmarks both models have independently-run scores for, Claude Sonnet 4.5 leads on 0 and Kimi K3 leads on 5. Benchmarks are one input — price and context window are on this page too.
Is Claude Sonnet 4.5 cheaper than Kimi K3?
They cost the same on a blended 3:1 basis: $6.00 per million tokens.
What context windows do Claude Sonnet 4.5 and Kimi K3 have?
Claude Sonnet 4.5: 1,000,000 tokens. Kimi K3: 1,048,576 tokens.
Who makes Claude Sonnet 4.5 and Kimi K3?
Claude Sonnet 4.5 is made by Anthropic. Kimi K3 is made by Moonshot AI.
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