Comparison · 2026-05-12
Kimi K2 Thinking vs Claude Sonnet 4.5 (latest)
Side-by-side comparison of pricing, context window and capabilities for Kimi K2 Thinking (Moonshot AI) and Claude Sonnet 4.5 (latest) (Anthropic). Focus: agents.
| Kimi K2 Thinking | Claude Sonnet 4.5 (latest) | |
|---|---|---|
| Vendor | Moonshot AI | Anthropic |
| Input price / 1M tokens | $0.600 | $3.00 |
| Output price / 1M tokens | $2.50 | $15.00 |
| Total per 1M (in + out) | $3.10 | $18.00 |
| Context window | 262K | 200K |
| Max output tokens | 262K | 64K |
| Tool calling | ✓ Yes | ✓ Yes |
| Structured output | Unknown | Unknown |
| Reasoning | ✓ Yes | ✓ Yes |
| Vision input | ✗ No | ✓ Yes |
| Open weights | ✓ Yes | ✗ No |
| Provider availability | 32 providers | 16 providers |
| Release date | 2025-11-06 | 2025-09-29 |
| Knowledge cutoff | 2024-08 | 2025-07-31 |
Quick takeaway
- Kimi K2 Thinking is 5.8× cheaper per 1M tokens (input + output combined).
- Kimi K2 Thinking has a larger context window (262K vs 200K).
- Kimi K2 Thinking is the open-weight option (self-hostable).
- Kimi K2 Thinking is more widely available across providers (32 vs 16).
Last updated:
Prices in USD per 1M tokens. Unknown means the provider does not publish per-token pricing.
Data is sourced from models.dev and normalized for comparison. Prices and capabilities may change. Always verify critical production decisions with the provider's official documentation.