SIDE BY SIDE
Kimi K2 Thinking vs Kimi K3.1 Pro
Both are Kimi models. Kimi K3.1 Pro was added to OpenRouter on 2026-10-23, Kimi K2 Thinking on 2025-11-06.
| Field | Kimi K2 Thinking | Kimi K3.1 Pro |
|---|---|---|
| Provider | MoonshotAI | MoonshotAI |
| Family | Kimi | Kimi |
| Province | The High Peaks | The High Peaks |
| Context window | 262K tokens | 1.05M tokens |
| Maximum output | 98K tokens | 944K tokens |
| Input / 1M tokens | $0.600 | $2.00 |
| Output / 1M tokens | $2.50 | $10.0 |
| Accepts | text | text, images, video |
| Produces | text | text |
| Reasoning | Yes | Yes |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2025-11-06 | 2026-10-23 |
| Model ID | moonshotai/kimi-k2-thinking | moonshotai/kimi-k3.1-pro |
Questions and answers
Which is cheaper, Kimi K2 Thinking or Kimi K3.1 Pro?
Kimi K2 Thinking costs less for both input ($0.600 vs $2.00) and output ($2.50 vs $10.0) per million tokens. On input, Kimi K2 Thinking is 70% cheaper.
Which has the larger context window?
Kimi K3.1 Pro: 1.05M tokens against 262K for Kimi K2 Thinking (4× as long).
What can one do that the other cannot?
Only Kimi K3.1 Pro supports image input.
Answers are computed from the 2026-10-24 catalog snapshot.