Codex Spark unavailable in Codex CLI with Business plan?

This is what I see:

~/Downloads ❯ codex
╭──────────────────────────────────────────────────╮
│ >_ OpenAI Codex (v0.104.0)                       │
│                                                  │
│ model:     gpt-5.3-codex high   /model to change │
│ directory: ~/Downloads                           │
╰──────────────────────────────────────────────────╯

  Tip: Join the OpenAI community Discord: http://discord.gg/openai

  Select Model and Effort
  Access legacy models by running codex -m <model_name> or in your config.toml

› 1. gpt-5.3-codex (current)  Latest frontier agentic coding model.
  2. gpt-5.2-codex            Frontier agentic coding model.
  3. gpt-5.1-codex-max        Codex-optimized flagship for deep and fast reasoning.
  4. gpt-5.2                  Latest frontier model with improvements across knowledge, reasoning and coding
  5. gpt-5.1-codex-mini       Optimized for codex. Cheaper, faster, but less capable.

I'm on a Business plan through my employer, isn't Spark available through it?