Kimi K3 vs Kimi K3.1 Pro.
Verdict by category, tale of the tape, shared benchmarks only, and cost at three workloads — all from the tracked data.
Verdict by category
| Category | Kimi K3 | Kimi K3.1 Pro | Winner |
|---|---|---|---|
| League Score | 70.6 | 69.4 | Kimi K3 |
| Coding (SWE-bench %) | — | — | — |
| Reasoning (GPQA %) | 93.5 | — | — |
| Context (tokens) | 1048576 | 1048576 | Draw |
| Speed (tok/s) | 44.8 | — | — |
| Price (blended $/1M) | $6.00 | $4.00 | Kimi K3.1 Pro (cheaper) |
Tale of the tape
| Spec | Kimi K3 | Kimi K3.1 Pro |
|---|---|---|
| Maker | Moonshot AI | Moonshot AI |
| Released | Jul 16, 2026 | Oct 23, 2026 |
| League Score | 71 | 69 |
| Context | 1,048,576 tokens | 1,048,576 tokens |
| Max output | 131,072 | 131,072 |
| $/1M input | $3.00 | $2.00 |
| $/1M output | $15.00 | $10.00 |
| Weights | Open | Open |
| Speed | 44.8 t/s | — |
Head-to-head benchmarks (shared only)
| Benchmark | Kimi K3 | Kimi K3.1 Pro |
|---|---|---|
| LiveBench overall | 64.6 | 71.3 |
Cost at three workloads
| Workload | Kimi K3 | Kimi K3.1 Pro |
|---|---|---|
| Light — 1M in / 250K out | $6.75 | $4.50 |
| Standard — 10M in / 2.5M out | $67.50 | $45.00 |
| Long-context — 50M in / 5M out | $225.00 | $150.00 |
The pick
Pick Kimi K3 if you want the higher overall League Score.
Pick Kimi K3.1 Pro if you want the lower running cost.
All figures from the model database — sources and dates on each model page. Cost your own workload or compare a different pair.
Frequently asked questions
Which is better overall, Kimi K3 or Kimi K3.1 Pro?
Kimi K3 leads on overall League Score, 71 to 69 — a gap of 1 points on a composite of sourced benchmarks. That is overall form, not every category: check the per-category verdicts before choosing.
Which is cheaper, Kimi K3 or Kimi K3.1 Pro?
Kimi K3.1 Pro is cheaper: $4.00 vs $6.00 blended per 1M tokens (3:1 input/output mix) — about 1.5x less per token.
Which has the bigger context window, Kimi K3 or Kimi K3.1 Pro?
Neither — both take 1M of context.
Are Kimi K3 and Kimi K3.1 Pro open source?
Kimi K3 is open weights — it can be downloaded and self-hosted; Kimi K3.1 Pro is open weights — it can be downloaded and self-hosted.