Kimi K3.1 Pro vs Kimi K3
There is no quality verdict yet: the AIGROW small-business benchmark has not run Kimi K3.1 Pro. On price, Kimi K3.1 Pro costs less: $2 in and $10 out per million tokens, against $3 in and $15 out for Kimi K3.
AIGROW credit covers Claude Opus 5.5, Claude Fable 5.2, Claude Fable 5.1, GPT-6 Astra, Claude Sonnet 5.5, GPT-6.1 Sol, GPT-6.1 Terra, Grok 4.7 and Gemini 4 Argon. See API credit
$25 a month brings $110 of API credit and cancels any time; $25 once buys $100. US dollars, standard rate, shortest context band. Price only: the benchmark has not run both.
- Kimi K3.1 Pro
- $10.00
- Kimi K3
- $15.00
- Kimi K3.1 Pro, per M tokens
- $2 / $10
- Kimi K3, per M tokens
- $3 / $15
3,000 tokens in and 400 out each, at list price.
Moonshot's new flagship against the previous-generation K3, a third cheaper on input and output. 1,000 support replies cost $15.00 on Kimi K3 and $10.00 on Kimi K3.1 Pro, so Kimi K3 costs 50% more. Prices are the makers’ own, checked on 12 November 2026.
What each one costs
The API price per million tokens and the cheapest app plan with each model, from the makers’ own pages. Each name opens that model’s full price page.
- Kimi K3.1 Pro
- On the Moonshot AI API, Kimi K3.1 Pro costs $2 per million input tokens and $10 per million output tokens.
- Kimi K3
- On the Moonshot AI API, Kimi K3 costs $3 per million input tokens and $15 per million output tokens.
Side by side
Each maker’s published rate for its standard tier. Cached input is what a repeated prompt prefix costs once the provider has stored it.
| Fact | Kimi K3.1 Pro | Kimi K3 |
|---|---|---|
| Maker | Moonshot AI | Moonshot AI |
| Tier | Flagships | Flagships |
| Input, per M tokens | $2.00 | $3.00 |
| Output, per M tokens | $10.00 | $15.00 |
| Cached input | $0.20 | $0.30 |
| Context window | 1.05M | 1.05M |
| Released | Not published | Jul 2026 |
| Weights | Open weights | Open weights |
What a job costs on each
1,000 runs of each job at the two list prices. The gap moves from job to job because the models price input, output and cached context differently.
| Job | Kimi K3.1 Pro | Kimi K3 | Cheaper |
|---|---|---|---|
| Support reply3,000 in, 400 out. | $10.00 | $15.00 | Kimi K3.1 Pro, 33% less |
| Document summary25,000 in, 1,000 out. | $60.00 | $90.00 | Kimi K3.1 Pro, 33% less |
| Agent task80,000 in (70,000 cached), 3,000 out. | $64.00 | $96.00 | Kimi K3.1 Pro, 33% less |
The token counts are ours, chosen to look like real work; the prices are the makers’. A model with no published cache price bills the agent task’s repeated context at its full input rate.
The small print
What each base rate leaves out, from the makers’ own pages: surcharges, discounts, promotions and cache pricing.
- Kimi K3.1 Pro
- Cache write $2 (5 min TTL) or $4 (1 h TTL). A highspeed variant costs $4 / $20. Batch 40% off. Moonshot calls it open-weight. Release date not stated on the official pages. Moonshot AI’s pricing page
- Kimi K3
- Moonshot now calls it the previous-generation K3, next to Kimi K3.1 Pro. Cache write $3 (5 min TTL) or $6 (1 h TTL). Open weights on Hugging Face (moonshotai/Kimi-K3). Changelog gives the month only. Moonshot AI’s pricing page
Other comparisons
Every head to head on the list that involves Kimi K3.1 Pro or Kimi K3.
Compare Kimi K3.1 Pro and Kimi K3 with 52 other models
The price list sets every model’s input and output price side by side, with what a support reply, a document summary and an agent task cost on each.
Prices checked 12 November 2026