gpt-oss-120b vs GLM 5.3 Flash
API pricing, context, and independently measured performance, side by side. gpt-oss-120b starts 60% cheaper on input than GLM 5.3 Flash at list prices.
gpt-oss-120b
OpenAI · released Aug 5, 2025
Best input$0.03 / MTok
Best output$0.17 / MTok
Context131K
Providers22
Fastest measured0.24s° TTFT · 293 tok/s
Open weightsToolsReasoningStructured outputPrompt caching
GLM 5.3 Flash
Z.ai · released Aug 26, 2026
Best input$0.075 / MTok
Best output$0.25 / MTok
Context1.31M
Providers23
Fastest measured0.97s° TTFT · 6 tok/s
Open weightsVisionToolsReasoningStructured outputPrompt caching
Cheapest providers, measuredUSD / MTOK
| MODEL | PROVIDER | INPUT | OUTPUT | TTFT | TPS | SMOKE |
|---|---|---|---|---|---|---|
| gpt-oss-120b | AKAkashML | $0.03 | $0.17 | 1.6s° | 68° tok/s | 4/5 |
| gpt-oss-120b | CWCoreWeave | $0.03 | $0.17 | 0.76s° | 51° tok/s | 3/5 |
| gpt-oss-120b |  DeepInfra | $0.037 | $0.17 | 0.55s° | 53° tok/s | 4/5 |
| GLM 5.3 Flash | GMIGMICloud | $0.075 | $0.25 | — | — | — |
| GLM 5.3 Flash |  Novita | $0.075 | $0.25 | 1.6s° | 89° tok/s | — |
| GLM 5.3 Flash | DeepInfra | $0.075 | $0.25 | — | — | — |
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