Kimi K3.1 Pro vs Kimi K3
Official Kimi API prices and LMArena scores, checked 2026-10-29. Add up to 2 more models to compare 4.
Kimi K3.1 Pro is cheaper and wins more LMArena tasks.
Kimi K3.1 Pro is 1.5x cheaper on input and output. Kimi K3.1 Pro scores 14 points higher for coding. Across 1 shared LMArena task, Kimi K3.1 Pro leads 1 to 0. A medium month (20M input + 5M output tokens) costs $90 on Kimi K3.1 Pro and $135 on Kimi K3.
- Pick Kimi K3.1 Pro if you want the lower bill ($90 vs $135 for a medium month), you care most about coding (+14) or you reuse long prompts (cached input $0.20 vs $0.30).
- Pick Kimi K3 if nothing here clearly favors it (no lower bill, bigger context, cheaper cache or LMArena lead of 3+ points over Kimi K3.1 Pro).
Medium: 20M input + 5M output tokens a month at list price (short-context rate, no caching or batch discounts).
Marked side is better: lower for prices, higher for context and scores. Bars are scaled to the larger of the two.
| Spec | Kimi K3.1 Pro | Kimi K3 |
|---|---|---|
| Price per 1M tokens | ||
| Input | $2 | $3 |
| Cached input | $0.20 | $0.30 |
| Output | $10 | $15 |
| Blend 3:1 | $4 | $6 |
| Sample month, medium | $90 | $135 |
| Context | ||
| Context window | 1.04858M tokens | 1.04858M tokens |
| Quality (LMArena, out of 100) | ||
| Coding | 57/100 #6 of 50 | 43/100 #13 of 50 |
| Chat | Not ranked | 39/100 #8 of 51 |
| Creative writing | Not ranked | 23/100 #12 of 51 |
| Roleplay and characters | Not ranked | 41/100 #4 of 51 |
| Reasoning and math | Not ranked | 41/100 #13 of 51 |
| Vision | Not ranked | Not ranked |
| Long documents | Not ranked | Not ranked |
| Cheap bulk and agents | Not ranked | 48/100 #20 of 34 |
| Details | ||
| Provider | Kimi | Kimi |
| API model id | kimi-k3.1-pro | kimi-k3 |
| Notes | Flat price across the 1M window. Cache writes cost $2 (5-minute) or $4 (1-hour). | Previous flagship. Cache writes cost $3 (5-minute) or $6 (1-hour). |
| Sources | ||
| Last checked | 2026-10-29 | 2026-10-29 |
| Official pricing | Kimi pricing | Kimi pricing |
Plans from data checked hourly against each vendor's official pricing page. Vendors state limits in different units, so we quote them as published. Team and enterprise plans are per seat.
API prices in USD per 1M tokens from each provider's official pricing page. Blend 3:1 = (3 x input + output) / 4. Sample month = stated input and output tokens at the list price, no caching. Quality: relative score out of 100 on each LMArena leaderboard (100 = top model we price on that board, n/a = not ranked there), data licensed CC BY 4.0. See how we pick.
Where each one ranks on LMArena
Relative score out of 100 on each leaderboard (100 = the top model we price there), with the rank among the models from our API price table that appear on that board.
- Coding (Code Arena): Kimi K3.1 Pro #6 of 50 (57/100), Kimi K3 #13 of 50 (43/100)
- Chat (Text Arena): Kimi K3.1 Pro not ranked, Kimi K3 #8 of 51 (39/100)
- Creative writing (Text Arena creative writing): Kimi K3.1 Pro not ranked, Kimi K3 #12 of 51 (23/100)
- Roleplay and characters (Text Arena multi-turn): Kimi K3.1 Pro not ranked, Kimi K3 #4 of 51 (41/100)
- Reasoning and math (Text Arena math): Kimi K3.1 Pro not ranked, Kimi K3 #13 of 51 (41/100)
- Vision (Vision Arena): Kimi K3.1 Pro not ranked, Kimi K3 not ranked
- Long documents (Document Arena): Kimi K3.1 Pro not ranked, Kimi K3 not ranked
- Cheap bulk and agents (Agent Arena): Kimi K3.1 Pro not ranked, Kimi K3 #20 of 34 (48/100)
Pricing details from the official pages
Kimi K3.1 Pro lists $2 input, $10 output, $0.20 cached input per 1M tokens on Kimi pricing. Kimi K3 lists $3 input, $15 output, $0.30 cached input per 1M tokens on Kimi pricing. Prices checked 2026-10-29.
- Kimi K3.1 Pro: Flat price across the 1M window. Cache writes cost $2 (5-minute) or $4 (1-hour).
- Kimi K3: Previous flagship. Cache writes cost $3 (5-minute) or $6 (1-hour).
Sample monthly bill at list price, no caching: Light (2M input + 0.5M output tokens): $9 vs $13.50. Medium (20M input + 5M output tokens): $90 vs $135. Heavy (200M input + 50M output tokens): $900 vs $1,350.
FAQ
Is Kimi K3.1 Pro cheaper than Kimi K3?
Kimi K3.1 Pro costs $2 input and $10 output per 1M tokens; Kimi K3 costs $3 and $15. For a medium month (20M input + 5M output tokens) Kimi K3.1 Pro is cheaper: $90 vs $135.
Which is better for coding, Kimi K3.1 Pro or Kimi K3?
On LMArena's Code Arena Kimi K3.1 Pro scores 57/100 (#6 of 50) and Kimi K3 43/100 (#13 of 50), so Kimi K3.1 Pro is ahead by 14 points.
Which has the bigger context window?
Kimi K3.1 Pro: 1.04858M tokens. Kimi K3: 1.04858M tokens. Both list the same window.
How much do Kimi K3.1 Pro and Kimi K3 cost per month?
Light (2M input + 0.5M output tokens): $9 vs $13.50. Medium (20M input + 5M output tokens): $90 vs $135. Heavy (200M input + 50M output tokens): $900 vs $1,350. Pick your own token counts in the plan vs API calculator.
Where do these numbers come from?
Prices come from each provider's official pricing page, checked daily. Quality is the relative score on the LMArena leaderboard dataset, licensed CC BY 4.0. Where a model is not ranked we show n/a.