Kimi K3.1 Pro Highspeed API pricing
Official Kimi list price, last checked Oct 29, 2026. Updated Oct 29, 2026.
Kimi K3.1 Pro Highspeed costs $4 per 1M input tokens and $20 per 1M output tokens, cached input at $0.20, and a 1M-token context window, per Kimi's official pricing page (checked Oct 29, 2026). It's a premium-priced model: number 73 of 77 by blended price ($8 per 1M tokens at a 3 to 1 input to output mix). LMArena doesn't list it on the boards we track, so we don't rank its quality. For less, look at GPT-5.6 Terra ($4.50 blended).
Kimi K3.1 Pro Highspeed price per million tokens
| Kimi K3.1 Pro Highspeed price per million tokens | USD |
|---|---|
| Input | $4 |
| Cached input | $0.20 |
| Output | $20 |
| Blended, 3 parts input to 1 part output | $8 |
| Context window | 1M tokens |
Official note from Kimi: Same model as K3.1 Pro at about 2 to 3 times the speed. Cache writes cost $4 (5-minute) or $8 (1-hour).
What Kimi K3.1 Pro Highspeed costs for real work
List-price estimates for a month, no discounts. Our math, not a quote: change the token counts in the plan vs API calculator.
| Workload | Tokens a month | Kimi K3.1 Pro Highspeed | GPT-5.6 Sol | GPT-5.6 Terra |
|---|---|---|---|---|
| Light: a side project or personal assistant | 2M in, 0.5M out | $18.00 | $18.00 | $10.00 |
| Medium: a small team or one product feature | 20M in, 5M out | $180 | $180 | $100 |
| Heavy: a production app | 200M in, 50M out | $1,800 | $1,800 | $1,000 |
| Medium with 80% of input cached | 20M in (16M cached), 5M out | $119 | $122 | $71.20 |
How Kimi K3.1 Pro Highspeed ranks on LMArena
It isn't on any LMArena board we track as of Oct 29, 2026. We don't estimate quality for unranked models. See the best model for each task for ranked options.
Closest rivals to Kimi K3.1 Pro Highspeed
The models nearest in price, other makers first. Ranks are on LMArena, where we have them.
| Model | In / out | Blended | Verdict |
|---|---|---|---|
| GPT-5.6 Sol | $4 / $20 | $8 | Same price, no score to separate them. Compare |
| Claude Opus 5.5 | $4 / $20 | $8 | Same price, no score to separate them. Compare |
| Muse Wonder 1.0 | $4 / $20 | $8 | Same price, no score to separate them. Compare |
| GPT-5.5 | $5 / $30 | $11.25 | Kimi K3.1 Pro Highspeed wins on price. Compare |
Cheaper alternatives to Kimi K3.1 Pro Highspeed
At least 40% cheaper blended, cheapest at the bottom of the list we found.
| Model | In / out | Blended | Verdict |
|---|---|---|---|
| GPT-5.6 Terra | $2 / $12 | $4.50 | GPT-5.6 Terra wins on price. Compare |
| Gemini 3.1 Pro Preview | $2 / $12 | $4.50 | Gemini 3.1 Pro Preview wins on price. Compare |
| GPT-6.1 Sol | $2 / $10 | $4 | GPT-6.1 Sol wins on price. Compare |
More from Kimi
- Kimi K3$3 in, $15 out per 1M
- Kimi K3.1 Pro$2 in, $10 out per 1M
- Kimi K2.7 Code Highspeed$1.90 in, $8 out per 1M
- Kimi K2.7 Code$0.95 in, $4 out per 1M
- Kimi K2.6$0.95 in, $4 out per 1M
FAQ
How much does the Kimi K3.1 Pro Highspeed API cost per million tokens?
$4 per 1M input tokens and $20 per 1M output tokens, plus $0.20 per 1M for cached input, as of Oct 29, 2026. A typical 3 to 1 input to output mix works out to $8 per 1M tokens.
Does Kimi K3.1 Pro Highspeed charge more for long prompts?
Kimi doesn't list a long-prompt surcharge for Kimi K3.1 Pro Highspeed. Its pricing note says: Same model as K3.1 Pro at about 2 to 3 times the speed. Cache writes cost $4 (5-minute) or $8 (1-hour).
Is Kimi K3.1 Pro Highspeed cheaper than GPT-5.6 Sol?
About the same. A medium month (20M input and 5M output tokens) costs $180 on Kimi K3.1 Pro Highspeed and $180 on GPT-5.6 Sol at list price.
How does Kimi K3.1 Pro Highspeed rank on LMArena?
It isn't listed on the LMArena boards we track, so we show no quality rank rather than guess.
What is a cheaper alternative to Kimi K3.1 Pro Highspeed?
GPT-5.6 Terra costs $2 in and $12 out per 1M tokens, about 1.8x less blended.
Where does this Kimi K3.1 Pro Highspeed price come from?
From Kimi's official pricing page, which we check every day. This page was last checked Oct 29, 2026.