GPT-6.1 Terra vs Kimi K3.1 Pro: Benchmarks, Pricing and Which to Pick

Description and use

<p>Two notable models shipped in October 2026. On October 26, OpenAI released GPT-6.1 Terra, the efficiency model in the GPT-6.1 family, built for professional work and automation. The same month, Moonshot AI released Kimi K3.1 Pro, a 3T-class open-weight flagship aimed at long coding tasks, 3D work and financial research, with weights due by November 4.</p> <p>They're built for different jobs. Terra goes after reliable task execution at a low token price. K3.1 Pro goes after flagship-level performance with open weights you can host yourself. This post compares them on architecture, benchmarks

Problem

<p>Two notable models shipped in October 2026. On October 26, OpenAI released GPT-6.1 Terra, the efficiency model in the GPT-6.1 family, built for professional work and automation. The same month, Moonshot AI released Kimi K3.1 Pro, a 3T-class open-weight flagship aimed at long coding tasks, 3D work and financial research, with weights due by November 4.</p> <p>They're built for different jobs. Terra goes after reliable task execution at a low token price. K3.1 Pro goes after flagship-level performance with open weights you can host yourself. This post compares them on architecture, benchmarks

Outcome

<p>Two notable models shipped in October 2026. On October 26, OpenAI released GPT-6.1 Terra, the efficiency model in the GPT-6.1 family, built for professional work and automation. The same month, Moonshot AI released Kimi K3.1 Pro, a 3T-class open-weight flagship aimed at long coding tasks, 3D work and financial research, with weights due by November 4.</p> <p>They're built for different jobs. Terra goes after reliable task execution at a low token price. K3.1 Pro goes after flagship-level performance with open weights you can host yourself. This post compares them on architecture, benchmarks

Evidence

GPT-6.1 Terra vs Kimi K3.1 Pro: Benchmarks, Pricing and Which to Pick

Source