Function isValidModel

packages/shared/src/models.ts:230–232

(model: string)

      },
      {
        id: "openai/gpt-5.3-codex-spark",
        name: "GPT 5.3 Codex Spark",
        description: "Low-latency codex variant",
        reasoning: { efforts: ["low", "medium", "high", "xhigh"], default: "high" },
      },
    ],