ChatGPT + Codex vs Google AI (Gemini, Antigravity): plan limits and pricing

Google AI (Gemini, Antigravity) has the lower entry price. ChatGPT + Codex Go is $8/mo; Google AI (Gemini, Antigravity) AI Plus is $4.99/mo. Prices from the vendors' pricing pages, checked 2026-10-30.

ChatGPT + Codex: Per the vendor, the number of Codex messages depends on the model, task size and complexity, and whether work runs locally or in the cloud. Plus and Standard Business get local-message estimates per five-hour period, given as a range per model; these are "not fixed message limits", and the usage dashboard shows current limits and reset times. Cloud tasks may use more of the allowance than local messages. Local messages and cloud chats share the plan's usage allowance, and weekly limits may also apply. Pro plans currently have no five-hour limit. ChatGPT Work shares the same pricing, credits and usage limits as Codex. Fast mode uses included usage at 2.5x (2x on purchased credits). Ultrafast uses 8x (6x on credits). Image generation uses limits about 3-5x faster. After reaching limits, Plus/Pro users and flexible-pricing workspaces can buy credits, which are billed per 1M tokens per model. Enterprise/Edu with flexible pricing have no fixed rate limits. Google AI (Gemini, Antigravity): In the Gemini app, Google meters compute used instead of daily prompts. Usage limits 'factor in the complexity of your prompt, the features you use, and the length of your chat. Your limit refreshes every 5 hours until you reach your weekly limit.' If you hit the cap on the biggest models, you are moved to smaller models. Media generation, Deep Research, the Pro model and Extended thinking/Deep Think use up the limit faster, and so do higher effort levels. Tiers are multiples: Plus is 2x and Pro 4x the 'standard' (no-plan) limit, and Ultra is 5x or 20x Pro. No prompt counts are published. Google Antigravity (app, IDE extensions and CLI) has its own agent quota that 'correlate[s] with the amount of work done by the agent'. Pro and Ultra get a quota refreshed every five hours up to a weekly rate limit; users without Pro or Ultra get a quota refreshed weekly. No figures are published. Pro and Ultra subscribers can buy AI credits for overage in Antigravity and Flow, and the subscriptions page now says credits can also extend Gemini app limits. Since June 18, 2026, Gemini CLI has been replaced by Antigravity CLI for unpaid and Google One users, so the old Gemini CLI daily request counts no longer apply to these plans.

ChatGPT + Codex Free is free: Codex, GPT-6 Luna at Standard speed in the desktop app, subject to rollout; no message figures published; Codex (ChatGPT pricing page), Limited; Image generation in Codex, Not available; Codex Cloud, Not included. Google AI (Gemini, Antigravity) Free is free: Gemini app usage, Standard limits; Antigravity, Basic weekly rate limits; 'A meaningful quota, refreshed weekly'; Antigravity CLI (replaced Gemini CLI), Gemini CLI replaced by Antigravity CLI on June 18, 2026; covered by the Antigravity weekly quota, no request count published; Storage, 15 GB.

ChatGPT + Codex: five-hour window, week. Google AI (Gemini, Antigravity): five-hour window, week, month. The figure inside each window is listed per plan on this page, or marked "not published" where the vendor gives none.