GPT-5.6 Sol vs Kimi
The open-versus-closed question at the top of the market. Sol scores higher and comes with the largest ecosystem; Kimi K3 is open-weight, comparable in context, and dramatically cheaper to run through a provider or on your own hardware. In 2026 the open models are close enough that this is a deployment decision, not a capability one.
| GPT-5.6 Sol | Kimi | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Current release | GPT-5.6 Sol | K3 |
| Tier | Frontier | Open weights |
| Context | 1M | 1M |
| Cost | Frontier price | Low cost |
| Modalities | text, vision, audio | text, vision |
| Open weights | No | Yes |
Cost is a tier, not a quote — providers change prices often. Check OpenAI and Moonshot AI before you commit. Last updated 2026-08-14.
Which one to pick
GPT-5.6 SolOpenAI
The strongest generalist — complex agentic and scientific work across modalities
Reach for it when- Best available generalist quality with no ops burden
- Audio and vision in one model
KimiMoonshot AI · K3
Frontier-adjacent quality you can self-host — the open model closest to the closed leaders
Reach for it when- Self-hosting, on-prem, or strict data residency
- Very high volume where the token bill dominates
Related comparisons
- Claude Opus vs GPT-5.6 SolThe headline matchup, and closer than either vendor's marketing suggests.
- GPT-5.6 Sol vs Gemini ProSol is the stronger all-round generalist; Gemini 3.1 Pro is the better value and the reasoning-benchmark leader.
- GPT-5.6 Sol vs GrokSol is the safer default and scores higher overall; Grok 4.6 matches it on some agentic work at a fraction of the short-context price.
- GPT-5.6 Sol vs GPT-5.6 TerraSame family, same million-token context, different price and depth.
- Claude Opus vs KimiClosed frontier against the open model that got closest to it.
- DeepSeek vs KimiTwo open models with different centres of gravity.