GPT-6.1 Terra vs GLM 5.3 FlashX Legal
API pricing, context, and independently measured performance, side by side. GLM 5.3 FlashX Legal starts 63% cheaper on input than GPT-6.1 Terra at list prices.
GPT-6.1 Terra
OpenAI · released Oct 26, 2026
Best input$1.00 / MTok
Best output$5.00 / MTok
Context1.05M
Providers6
Fastest measured2.4s° TTFT · 141 tok/s
VisionToolsReasoningStructured outputPrompt caching
GLM 5.3 FlashX Legal
Z.ai · released Nov 2, 2026
Best input$0.37 / MTok
Best output$1.25 / MTok
Context1.05M
Providers1
Fastest measured—
VisionToolsReasoningStructured outputPrompt caching
Cheapest providers, measuredUSD / MTOK
| MODEL | PROVIDER | INPUT | OUTPUT | TTFT | TPS | SMOKE |
|---|---|---|---|---|---|---|
| GPT-6.1 Terra |  OpenAI | $1.00 | $5.00 | 2.4s° | 141° tok/s | — |
| GPT-6.1 Terra |  Amazon Bedrock | $1.10 | $5.50 | — | — | — |
| GPT-6.1 Terra |  Azure | $1.20 | $6.00 | — | — | — |
| GLM 5.3 FlashX Legal |  Z.AI | $0.37 | $1.25 | — | — | — |
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