Kimi K3.1 Pro vs Kimi K3
Kimi K3.1 Pro comes out ahead, 46 to 42 on our weighted score, and it is the cheaper option too.
- Our pick
Moonshot AIKimi K3.1 Pro
46/100- ECI—
- Price$2.00 / $10.00
- Context1.05M
- Moonshot AI
Kimi K3
42/100- ECI158.3
- Price$3.00 / $15.00
- Context1.05M
Add a model
Make it a three-way comparison.
Kimi K3.1 Pro is our pick
Kimi K3.1 Pro is the better all-round choice, scoring 46/100 against Kimi K3 (42). It leads on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceKimi K3.1 ProKimi K3.1 Pro $4.00 · Kimi K3 $6.00 per 1M tokens (3:1 blend)
- Longest contextAbout the sameKimi K3.1 Pro 1,048,576 · Kimi K3 1,048,576 tokens
- Widest inputsSame inputsKimi K3.1 Pro: Text, Images, Video · Kimi K3: Text, Images, Video
- Self-hostingKimi K3Publishes downloadable weights
| Measure | Weight | Kimi K3.1 Pro | Kimi K3 |
|---|---|---|---|
| Price | 50% | 20 | 12 |
| Inputs & features | 30% | 80 | 80 |
| Context window | 20% | 61 | 61 |
| Overall | 100% | 46/100 | 42/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Kimi K3.1 ProMoonshot AI | Kimi K3Moonshot AI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | 158.3 |
| ECI rank | — | #20 of 165 |
| GPQA DiamondGraduate-level science questions | — | 93.1% |
| FrontierMath Tiers 1–3Research-level mathematics | — | 72.2% |
| OTIS Mock AIME 2024–2025Competition mathematics | — | 97.2% |
| SimpleQA VerifiedShort factual questions | — | 50.6% |
| Price per million tokens | ||
| Input | $2.00 (best) | $3.00 |
| Output | $10.00 (best) | $15.00 |
| Cached input | $0.20 (best) | $0.30 |
| Blended (3:1) | $4.00 (best) | $6.00 |
| Long-context rate | Same rate | Same rate |
| Price source | Official Moonshot AI API | Official Moonshot AI API |
| Limits | ||
| Context window | 1,048,576 tokens | 1,048,576 tokens |
| Max output | 131,072 tokens | 131,072 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | Yes | Yes |
| Reasoning | Yeslow · high · max | Yeslow · high · max |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | kimi-k3.1-pro | kimi-k3 |
| API providers | 17 | 76 (best) |
| Released | Oct 23, 2026 | Jul 16, 2026 |
| Knowledge cutoff | — | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Kimi K3.1 Pro$40.00
- Kimi K3$60.00
Which should you choose?
Which is better: Kimi K3.1 Pro or Kimi K3?
Kimi K3.1 Pro is the better all-round choice, scoring 46/100 against Kimi K3 (42). It leads on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, Kimi K3.1 Pro or Kimi K3?
Kimi K3.1 Pro is cheaper at $2.00 input / $10.00 output per million tokens (official Moonshot AI API price). Kimi K3 costs $3.00 input / $15.00 output per million tokens (official Moonshot AI API price). At a typical mix of three input tokens to one output token, that is $4.00 per million tokens for Kimi K3.1 Pro versus $6.00 for Kimi K3 (1.5× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Kimi K3.1 Pro has not been scored yet and Kimi K3 has an ECI of 158.3.
Which is better for coding?
There are no published SWE-bench Verified results for Kimi K3.1 Pro and Kimi K3 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
Kimi K3.1 Pro and Kimi K3 share the same 1,048,576-token context window. Maximum output per response: Kimi K3.1 Pro up to 131,072, Kimi K3 up to 131,072 tokens.
Which can read images, PDFs, audio or video?
Kimi K3.1 Pro accepts text, images and video; Kimi K3 accepts text, images and video. They handle the same number of input types.
Are any of these open source?
Kimi K3 publishes its weights and can be self-hosted; Kimi K3.1 Pro is proprietary.
Which is newer?
Kimi K3.1 Pro is the newest, released Oct 23, 2026. Kimi K3 came out Jul 16, 2026.
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.
