Kimi K3 vs Solar Pro 4: Specs & Benchmark Comparison
Kimi K3 is developed by Moonshot AI, while Solar Pro 4 comes from Upstage. Kimi K3 was released in July 2026, and Solar Pro 4 followed a month later in August 2026. Kimi K3 has a published size of about 2.8 trillion parameters; Upstage has not disclosed the parameter count of Solar Pro 4.
The two models share 3 published benchmarks. Kimi K3 leads on 3 of them. The widest gaps are on BrowseComp, where Kimi K3 scores 91.2% against 49.2%; Terminal-Bench 2.1, where Kimi K3 scores 88.3% against 57.0%. Averaged across everything we track, Kimi K3 sits at 67.8% and Solar Pro 4 at 69.9%.
Solar Pro 4 is the cheaper API at $0.30 per million input tokens and $1.20 per million output tokens, roughly 10 times cheaper than Kimi K3 at $3 and $15. Kimi K3 takes the larger context window at 1M tokens, compared with 524K for Solar Pro 4. Kimi K3 accepts text and images as input, while Solar Pro 4 accepts text. On tooling, only Kimi K3 supports function calling and only Kimi K3 offers structured output.
| Characteristic | Kimi K3 | Solar Pro 4 |
|---|---|---|
| Company | Moonshot AI | Upstage |
| Release Date | July 16, 2026 | August 6, 2026 |
| Parameters | 2.8T | — |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 524K |
| Context (output) | 1.0M | 131K |
| Input Price / 1M | $3.00 | $0.30 |
| Output Price / 1M | $15.00 | $1.20 |
| Average Score | 67.8% | 69.9% |
| Benchmarks | ||
| BrowseComp | 91.2% | 49.2% |
| Terminal-Bench 2.1 | 88.3% | 57.0% |
| GPQA | 94.0% | 89.0% |
Visual Benchmark Comparison
Verdict
Solar Pro 4 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Kimi K3 — 0.7, Solar Pro 4 — 0.7.
Solar Pro 4 is 12.0x cheaper: input $0.30/1M vs $3.00/1M tokens.
Kimi K3 supports a larger context: 1M vs 524K tokens.
Solar Pro 4 is newer: released 8/6/2026 vs 7/16/2026.
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Frequently Asked Questions
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The Kimi K3 and Solar Pro 4 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Kimi K3 or Solar Pro 4 page. See also the complete list of AI model comparisons.