Gemini 2.5 Flash vs Kimi K2 Thinking
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Google · Jun 2025
The 2025 fast-tier favorite: hybrid reasoning, full multimodality and a 1M context at $0.30/$2.50.
Moonshot AI · Nov 2025
A trillion-parameter open reasoning agent that can chain 200–300 tool calls — the open-weights agentic standout of late 2025.
The verdict
Kimi K2 Thinking wins 2 of the 2 benchmarks these models share, against 0 for Gemini 2.5 Flash. Gemini 2.5 Flash is about 1.3x cheaper per blended million tokens (3:1 input:output mix). Gemini 2.5 Flash also takes 1.0M of context versus 262K for Kimi K2 Thinking. And Kimi K2 Thinking is open-weights (Modified MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
Benchmark head-to-head 0–2
Specs & pricing
| Gemini 2.5 Flash | Kimi K2 Thinking | |
|---|---|---|
| modhub Index | — | 67.6 |
| Input price / 1M | $0.3 | $0.6 |
| Output price / 1M | $2.5 | $2.5 |
| Context window | 1.0M | 262K |
| Max output | 66K | — |
| Open weights | no | yes (Modified MIT) |
| Reasoning model | yes | yes |
| Multimodal input | text, image, audio, video | text |
| Knowledge cutoff | Jan 2025 | Apr 2025 |
| Released | Jun 2025 | Nov 2025 |
| Example monthly cost* | $6.75 | $9.75 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Gemini 2.5 Flash or Kimi K2 Thinking?
- Kimi K2 Thinking wins 2 of the 2 benchmarks these models share, against 0 for Gemini 2.5 Flash. Gemini 2.5 Flash is about 1.3x cheaper per blended million tokens (3:1 input:output mix). Gemini 2.5 Flash also takes 1.0M of context versus 262K for Kimi K2 Thinking. And Kimi K2 Thinking is open-weights (Modified MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
- Which is cheaper, Gemini 2.5 Flash or Kimi K2 Thinking?
- Gemini 2.5 Flash costs $0.3/$2.5 per million input/output tokens, while Kimi K2 Thinking costs $0.6/$2.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $6.75 versus $9.75.
- Which model is better for coding, Gemini 2.5 Flash or Kimi K2 Thinking?
- On SWE-bench Verified — the standard agentic-coding benchmark — Kimi K2 Thinking scores 71.3% versus ~48.9% for Gemini 2.5 Flash, making Kimi K2 Thinking the stronger pick for coding agents.