Gemini 2.5 Flash Preview 05-20 vs Kimi K2 Instruct
Gemini 2.5 Flash Preview 05-20 comes out ahead, 67 to 50 on our weighted score, and it is the cheaper option too.
- Our pick
GoogleGemini 2.5 Flash Preview 05-20
67/100- ECI141.5
- Price$0.146 / $1.96
- Context1.05M
Moonshot AIKimi K2 Instruct
50/100- ECI139.9
- Price$0.57 / $2.30
- Context131K
Add a model
Make it a three-way comparison.
Gemini 2.5 Flash Preview 05-20 is our pick
Gemini 2.5 Flash Preview 05-20 is the better all-round choice, scoring 67/100 against Kimi K2 Instruct (50). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityGemini 2.5 Flash Preview 05-20Capabilities Index (ECI): Gemini 2.5 Flash Preview 05-20 141.5 · Kimi K2 Instruct 139.9
- Lowest priceGemini 2.5 Flash Preview 05-20Gemini 2.5 Flash Preview 05-20 $0.60 · Kimi K2 Instruct $1.00 per 1M tokens (3:1 blend)
- Longest contextGemini 2.5 Flash Preview 05-20Gemini 2.5 Flash Preview 05-20 1,048,576 · Kimi K2 Instruct 131,072 tokens
- Widest inputsGemini 2.5 Flash Preview 05-20Gemini 2.5 Flash Preview 05-20: Text, Images, PDFs, Audio, Video · Kimi K2 Instruct: Text
- Self-hostingKimi K2 InstructPublishes downloadable weights (Modified MIT)
| Measure | Weight | Gemini 2.5 Flash Preview 05-20 | Kimi K2 Instruct |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 66 | 64 |
| Price | 25% | 58 | 48 |
| Inputs & features | 15% | 90 | 25 |
| Context window | 10% | 61 | 25 |
| Overall | 100% | 67/100 | 50/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Gemini 2.5 Flash Preview 05-20Google | Kimi K2 InstructMoonshot AI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 141.5 (best) | 139.9 |
| ECI rank | #106 of 165 (best) | #112 of 165 |
| OTIS Mock AIME 2024–2025Competition mathematics | 70.8% | — |
| Price per million tokens | ||
| Input | $0.146 (best) | $0.57 |
| Output | $1.96 (best) | $2.30 |
| Cached input | — | — |
| Blended (3:1) | $0.60 (best) | $1.00 |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 2 providers | Median of 11 providers |
| Limits | ||
| Context window | 1,048,576 tokens (best) | 131,072 tokens |
| Max output | 65,536 tokens (best) | 32,768 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | No |
| PDFs | Yes | No |
| Audio | Yes | No |
| Video | Yes | No |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | OpenModified MIT |
| API model ID | — | — |
| API providers | 2 | 11 (best) |
| Released | May 20, 2025 | Jul 11, 2025 |
| Knowledge cutoff | Jan 2025 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Gemini 2.5 Flash Preview 05-20$5.39
- Kimi K2 Instruct$10.30
Which should you choose?
Which is better: Gemini 2.5 Flash Preview 05-20 or Kimi K2 Instruct?
Gemini 2.5 Flash Preview 05-20 is the better all-round choice, scoring 67/100 against Kimi K2 Instruct (50). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, Gemini 2.5 Flash Preview 05-20 or Kimi K2 Instruct?
Gemini 2.5 Flash Preview 05-20 is cheaper at $0.146 input / $1.96 output per million tokens (median across 2 API providers). Kimi K2 Instruct costs $0.57 input / $2.30 output per million tokens (median across 11 API providers). At a typical mix of three input tokens to one output token, that is $0.60 per million tokens for Gemini 2.5 Flash Preview 05-20 versus $1.00 for Kimi K2 Instruct (1.7× as much).
Which scores higher on benchmarks?
Gemini 2.5 Flash Preview 05-20 scores higher on the Capabilities Index (ECI): Gemini 2.5 Flash Preview 05-20 141.5 (#106 of 165) and Kimi K2 Instruct 139.9 (#112 of 165). The confidence ranges of the top two overlap (139.3–142.9 vs 136.3–141.6), so treat the gap as small.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini 2.5 Flash Preview 05-20 and Kimi K2 Instruct yet, so there is no like-for-like coding score. On overall capability, Gemini 2.5 Flash Preview 05-20 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.
Which has the bigger context window?
Gemini 2.5 Flash Preview 05-20 has the largest context window at 1,048,576 tokens, against 131,072 for Kimi K2 Instruct. Maximum output per response: Gemini 2.5 Flash Preview 05-20 up to 65,536, Kimi K2 Instruct up to 32,768 tokens.
Which can read images, PDFs, audio or video?
Gemini 2.5 Flash Preview 05-20 accepts text, images, PDFs, audio and video; Kimi K2 Instruct accepts text. Gemini 2.5 Flash Preview 05-20 handles the widest range of inputs.
Are any of these open source?
Kimi K2 Instruct publishes its weights (Modified MIT) and can be self-hosted; Gemini 2.5 Flash Preview 05-20 is proprietary.
Which is newer?
Kimi K2 Instruct is the newest, released Jul 11, 2025. Gemini 2.5 Flash Preview 05-20 came out May 20, 2025. Knowledge cutoff: Gemini 2.5 Flash Preview 05-20 Jan 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.
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