Model comparison
Solar Pro 4 vs Kimi K3
- Input
- $0.30
- Output
- $1.20
- Context
- 512K tokens
- Released
- 2026-08-06
- Input
- $3.00
- Output
- $15.00
- Context
- 1M
- Released
- 2026-07-16
Kimi K3 scores higher on 2 of the 2 benchmarks both models report; Solar Pro 4 is cheaper on input tokens ($0.3 vs $3 per 1M, 10×); Kimi K3 has the larger context window (1M vs 512K); Kimi K3 ships open weights while Solar Pro 4 is API-only.
Specs and pricing side by side
| Spec | Solar Pro 4 | Kimi K3 |
|---|---|---|
| Maker | Upstage | Moonshot AI (Kimi) |
| Released | 2026-08-06 | 2026-07-16 |
| Context window | 512K tokens | 1M |
| Max output | 128K tokens | not published |
| Input price | $0.30 | $3.00 |
| Output price | $1.20 | $15.00 |
| Parameters | Undisclosed | 2.8T total · ~16 of 896 experts active per token |
| License | Proprietary (Upstage API and on-premises) | Kimi K3 License (custom, weights published on Hugging Face 2026-07-26) |
| Weights | API only | Open weights |
| Modalities | Text | Text, Vision, Video |
| Knowledge cutoff | February 2026 | not published |
Benchmarks both models report
| Benchmark | Solar Pro 4 | Kimi K3 |
|---|---|---|
| GPQA Diamond | 89% | 93.5% |
| BrowseComp | 49.2% | 91.2% |
Scores are as published by each maker or its cited source; harness, reasoning effort and date can differ between rows, so treat small gaps as ties. Sources are listed on each model page.
Which one should you pick?
Pick Solar Pro 4 if…
- Cost matters: input tokens cost 10× less ($0.3 vs $3 per 1M).
- Your use case is: reach for it when an agent has to work across several long documents, contracts or data files in one session.
Pick Kimi K3 if…
- You care about GPQA Diamond, BrowseComp (it scores higher on 2 shared benchmarks).
- You need the longer context (1M vs 512K).
- You want to self-host or fine-tune (open weights, Kimi K3 License (custom, weights published on Hugging Face 2026-07-26)).
- You need Vision / Video input, which Solar Pro 4 lacks.
- Your use case is: reach for it for long-horizon agentic coding and browser/tool workflows that need a very long context.
FAQ
Which is better, Solar Pro 4 or Kimi K3?
Kimi K3 scores higher on 2 of the 2 benchmarks both models report; Solar Pro 4 is cheaper on input tokens ($0.3 vs $3 per 1M, 10×); Kimi K3 has the larger context window (1M vs 512K); Kimi K3 ships open weights while Solar Pro 4 is API-only. The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
How much cheaper is Solar Pro 4?
Solar Pro 4: $0.30 input, $1.20 output. Kimi K3: $3.00 input, $15.00 output (list API prices as published by each maker).
What are the context windows of Solar Pro 4 and Kimi K3?
Solar Pro 4 offers 512K tokens with up to 128K tokens output; Kimi K3 offers 1M.
Is Solar Pro 4 newer than Kimi K3?
Solar Pro 4 was released 2026-08-06; Kimi K3 was released 2026-07-16.