WhichAI wiki

WhichAI / Compare / GPT-5.6 Sol vs Kimi K3

GPT-5.6 SolvsKimi K3

Kimi K3 scores higher on the September 8, 2026 index. Full context below: price, context window, strengths and honest limits. Verified September 8, 2026.

GPT-5.6 Sol
Kimi K3
Provider
OpenAI
Moonshot AI
AA index
58.9
59.7
Released
2026-07-09
2026-07-16
Context
1M
1M
Price $/1M
$5 / $30
$3 / $15
Access
Released July 9, 2026 (rolling out) · API $5/$30 per 1M tokens · up to 750 tok/s on Cerebras
API $3/$15 per 1M tokens ($0.30 cached) · free kimi.com chat · open weights on Hugging Face (July 27, Modified MIT)

n/a = not published or not yet verified. Scores marked ~ are WhichAI estimates and should not be compared 1:1 with measured scores.

In one line each

GPT-5.6 Sol: OpenAI's July flagship: max reasoning effort, programmatic tool calling and an 'ultra mode' that spins up subagents. Since GPT-6 Astra arrived at double the output price, Sol is the better-value half of OpenAI's line for agentic work.

Kimi K3: Moonshot's July flagship: 2.8T-parameter MoE, 1M context, native vision, and the best published BrowseComp score (91.2%). The strongest agentic challenger to the US frontier, and the largest model whose weights you can actually download.

Compare them live in the app Which one is right for you? 30-second finder