ChatGPT Work and Codex share usage. Both use the same pricing, credits, and usage limits. See Codex pricing for details.
Fast mode
GPT-5.5 retires from ChatGPT, ChatGPT Work, and Codex on all plans on October 14, 2026. The OpenAI API isn’t affected. See GPT-5.5 retirement for migration guidance.
Codex offers the ability to increase the speed of the model for increased credit consumption.
For GPT-5.6, GPT-5.5, and GPT-5.4, Fast mode increases model speed by 1.5x. GPT-5.6 and GPT-5.5 consume credits at 2.5x the Standard rate; GPT-5.4 consumes credits at 2x the Standard rate.
GPT-6 Astra Fast mode consumes credits at 2.5x the Standard rate where available. See Models for model availability and Pricing for token rates.
Use /fast on, /fast off, or /fast status in the CLI to change or inspect
the current setting. You can also persist the default with service_tier = "fast" plus [features].fast_mode = true in config.toml. Fast mode is
available in the ChatGPT desktop app, Codex CLI, and IDE extension when you
sign in with ChatGPT. Fast mode is a ChatGPT credit feature. With an API key,
Codex uses API token pricing instead, and ChatGPT credit multipliers don’t
apply. API Priority processing has its own billing rate; for GPT-5.6, it costs
2x the Standard API token rate.