Kimi K3.1 Pro vs gpt-oss-120b
API pricing, context, and independently measured performance, side by side. gpt-oss-120b starts 92% cheaper on input than Kimi K3.1 Pro at list prices.
Kimi K3.1 Pro
Moonshot AI · released Oct 23, 2026
Best input$0.329 / MTok
Best output$7.00 / MTok
Context1.05M
Providers24
Fastest measured0.81s° TTFT · 290 tok/s
Open weightsVisionToolsReasoningStructured outputPrompt caching
gpt-oss-120b
OpenAI · released Aug 5, 2025
Best input$0.027 / MTok
Best output$0.099 / MTok
Context131K
Providers26
Fastest measured0.26s° TTFT · 214 tok/s
Open weightsToolsReasoningStructured outputPrompt caching
Cheapest providers, measuredUSD / MTOK
| MODEL | PROVIDER | INPUT | OUTPUT | TTFT | TPS | SMOKE |
|---|---|---|---|---|---|---|
| Kimi K3.1 Pro |  Relace | $0.329 | $8.12 | — | — | — |
| Kimi K3.1 Pro | SRSail Research | $0.346 | $16.58 | — | — | — |
| Kimi K3.1 Pro |  Engy | $1.40 | $7.00 | — | — | — |
| gpt-oss-120b |  PrimeIntellect | $0.027 | $0.099 | 11.8s° | 97° tok/s | — |
| gpt-oss-120b |  Near AI | $0.03 | $0.15 | 1.3s° | 74° tok/s | — |
| gpt-oss-120b |  Venice | $0.03 | $0.15 | 1.9s° | 60° tok/s | — |
TTFT/TPS: ModelIndex-measured medians (P50, trailing 21d) · chat10k profile (~10K in / 200 out) · ° = measured via OpenRouter routing (adds a hop) · SMOKE: of 5 programmatic capability probes passed · methodology v1.1 — full details on each model page