Comparison · MoonshotAI and xAI
Kimi K3 vs Grok 4.5
Listed API prices of Kimi K3 and Grok 4.5 turned into the cost of the same three standard tasks. Output quality, speed and answer length are not compared.
Calculated impact cost per task and per month
For an L2 task (deep analysis over a 50,000-token document, 3 steps), Kimi K3 costs $0.522 and Grok 4.5 $0.336 at the prices listed in the United States on , so Kimi K3 is 55.4 % more than Grok 4.5, counting visible output only, without cache discounts or hidden reasoning.
| Task | Kimi K3, per task | Grok 4.5, per task | Kimi K3, per month | Grok 4.5, per month | Kimi K3 vs Grok 4.5, per task |
|---|---|---|---|---|---|
| L1Micro-task (classification or strict JSON extraction) | $0.0075per L1 task | $0.0042per L1 task | $109.50per month | $61.32per month | +78.6 % |
| L2Deep analysis over a 50,000-token document | $0.522per L2 task | $0.336per L2 task | $7,621.20per month | $4,905.60per month | +55.4 % |
| L3Agentic coding loop, 15 steps | $4.08per L3 task | $2.69per L3 task | $59,589.90per month | $39,201.00per month | +52.0 % |
Calculated Per month: 20 tasks an hour around the clock, 730 hours.
Prices USD per 1M tokens
| Price | Kimi K3 | Grok 4.5 |
|---|---|---|
| Input, per 1M tokens | $3.00 | $2.00 |
| Output, per 1M tokens | $15.00 | $6.00 |
| Price from | Provider's price list · source page Published | OpenRouter · source page (data) Published |
| Read | · the United States | · the United States |
| Context window | 1,048,576 tokens | 500,000 tokens |
What can I use it for? six common tasks, our data checks
Quality on your task: not measured by Measured Lab yet.
| Task | Kimi K3 | Grok 4.5 |
|---|---|---|
| Answer customer messages | Fits on price and context | — |
| Pull data from invoices and documents with strict JSON and page images | Not confirmed: strict JSON output not in our data | — |
| Summarize documents and meetings | Fits on price and context | — |
| Translate content | Fits on price and context | — |
| Chat assistant on your website | Fits on price and context | — |
| Write and review code with tool calls | Not confirmed: tool calls not in our data | — |
| Tasks it fits | 4 of 6 | — |
Checks of our data for six common tasks: a published price, a context window and answer length for the task and, where the task needs them, strict JSON output, page images and tool calls; prices, cost a month and terms for each model on its model card. Grok 4.5 is not in the model picker. Compare models for your own task in the model picker.
Price changes in the last 30 days
- The listed price of Kimi K3 changed on on OpenRouter: output $12.53 → $11.94 per 1M tokens.
- The listed price of Kimi K3 changed on on OpenRouter: input $0.30 → $0.24 per 1M tokens.
- The listed price of Kimi K3 changed on on OpenRouter: output $11.94 → $10.80 per 1M tokens.
- The listed price of Kimi K3 changed on on OpenRouter: input $0.24 → $0.19 per 1M tokens.
- The listed price of Kimi K3 changed on on OpenRouter: output $10.80 → $15.00 per 1M tokens.
- The listed price of Kimi K3 changed on on OpenRouter: output $15.00 → $16.00 per 1M tokens.