GPT-6.1 Terra vs Kimi K3.1 Pro
| Spec | GPT-6.1 Terra | Kimi K3.1 Pro |
|---|---|---|
| Respan Index | 68.9 (#9) | 71.2 (#5) |
| Blended price per 1M | $1 | $3.6 |
| Context window | 1.1M | 1.0M |
| Input / output per 1M | $0.5 / $2.5 | $1.8 / $9 |
| Max output | 128K | 1.0M |
| Input | text, vision | text, vision, video |
| Released | 2026-10-26 | 2026-10-23 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | GPT-6.1 Terra | Kimi K3.1 Pro |
|---|---|---|
| Coding | 57.9 GPT-6.1 Terra | 67.7 Kimi K3.1 Pro |
| Agents | 77.0 GPT-6.1 Terra | 69.7 Kimi K3.1 Pro |
| Reasoning | 83.0 GPT-6.1 Terra | 83.7* Kimi K3.1 Pro |
| Knowledge & language | 57.4 GPT-6.1 Terra | 71.5* Kimi K3.1 Pro |
| Human preference | 57.9 GPT-6.1 Terra | 58.5 Kimi K3.1 Pro |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
Kimi K3.1 Pro leads on 3 of the 4 benchmarks both report. Higher is better. Each score links to where it was published.
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro |
|---|---|---|
| LMArena Agent (LMArena) | 0.1057 | 0.0596 |
| LMArena WebDev (LMArena) | 1673 | 1695 |
| Terminal-Bench 4.0 (Vals AI) | 49.5% | 63.6% |
| Terminal-Bench 4.0 | 50.3% | 65.7% |
FAQ
Is GPT-6.1 Terra better than Kimi K3.1 Pro?
Kimi K3.1 Pro scores 71.2 on the Respan Index (#5), ahead of GPT-6.1 Terra at 68.9 (#9). Kimi K3.1 Pro leads on 3 of the 4 benchmarks both report.
Which is cheaper, GPT-6.1 Terra or Kimi K3.1 Pro?
GPT-6.1 Terra lists at $0.5 input and $2.5 output per 1M tokens; Kimi K3.1 Pro at $1.8 and $9. GPT-6.1 Terra is 3.6x cheaper per token at list price.
Which has the larger context window?
GPT-6.1 Terra accepts 1.1M tokens and Kimi K3.1 Pro 1.0M tokens.