What shipped

Google completed the Gemini 4 family on November 12 with its speed tier. Carbon and Argon, by Google's own description, are for deep, long-horizon reasoning. Hydrogen is built for rapid execution: everyday coding, multi-step agent work, and the consumer surfaces most people actually touch. It has four thinking levels, running from low to a new xhigh tier, a 1 million-token context window priced flat at $1.50 per million input tokens and $7.50 per million output tokens. The launch post states those flat rates across the context window and gives no introductory-price expiry. Argon's standard price, which takes effect on December 1, is $4 and $20.

The availability list is the unusual part. Hydrogen went everywhere on the same day: the Gemini API in AI Studio, Gemini for business, the Gemini app, Antigravity for paying Pro and Ultra subscribers, and Google Search, where Google says it is available for all users globally. Robby Stein, Google's VP of Product for Search, calls it the biggest model upgrade to Search yet; Search Engine Roundtable reports him describing Hydrogen as the new default model in AI Mode.

The comparison Google chose to publish

Gemini 4 Hydrogen benchmark results as reported by Google
Google's reported benchmark results. Image: Google

Launch posts choose their comparisons. Google chose to compare its speed tier against its own reasoning tier, on the record. On the Artificial Analysis Intelligence Index, as quoted in the post, Hydrogen scores 51 at its default high thinking level and 54 at xhigh. Argon scores 50. Against the model it actually replaces, Gemini 3.8 Flash, the reported jump is larger: 57% on Terminal-Bench 4.1 against 18.2%, tasks finished 2.5 times faster, and fabricated claims cut by more than five times, a figure the post states without a method or a base rate.

A second feature points the same way. Orchestrator, new in Antigravity, switches between Carbon and Hydrogen inside a single session, using the frontier model for judgment and the fast one for execution. Google says that pairing reached near-Carbon success rates on Terminal-Bench 4.0 while using 24% less quota and finishing 19% faster. Note the version change inside one announcement: the standalone score is quoted on Terminal-Bench 4.1, the pairing result on 4.0. The two numbers cannot be combined, and the post does not combine them. Readers should not either.

Read the scoreboard carefully

Every figure above is Google's. The index score is the one number with an independent source behind it, and even there the comparison needs a date attached. When ALFW covered Argon's wide release on October 13, the Artificial Analysis index put Argon at 53. Google's post today puts Argon at 50. This desk has not established whether the two snapshots use identical index versions, settings and evaluation conditions, so a one-point lead is evidence the two tiers score close on this index as quoted today, not that the cheaper model has won across tasks. The safety numbers in the post, an up to 81% reduction in agentic overreach, a 12x cut in misaligned actions, a 96.7% honesty rate, come from Google's internal evaluations, and the launch post does not provide the methodology needed to reproduce them.

None of that makes the launch minor. It relocates where the launch matters. For developers, the decision is now empirical: a $1.50 and $7.50 tier that Google itself benchmarks within a point of Argon is the default candidate for volume work until Argon proves the difference on a workload the buyer owns. For everyone else, the change already happened at the surface level: the model Google has put in front of every Search user changed today. How individual queries are routed, and in which languages, is not specified in the announcement, and the desk does not claim it.

Sources

  1. [1] Google, "Introducing Gemini 4 Hydrogen for Agentic Workflows", blog.google, November 12, 2026Read source
  2. [2] Google, "Google Search gets a major upgrade with Gemini 4 Hydrogen", blog.google, November 12, 2026Read source
  3. [3] Gemini 4 Hydrogen model card, Google DeepMind (PDF)Read source
  4. [4] Search Engine Roundtable, "Google Search Gets Major Upgrade With Gemini 4 Hydrogen", November 12, 2026Read source
  5. [5] 9to5Google, "Google announces Gemini 4 Hydrogen with 'significant leaps' in speed, intelligence", November 12, 2026Read source
  6. [6] ALFW, "Gemini 4 Argon Is Finally Open. The Low Price Expires in Seven Weeks.", October 13, 2026 (Argon at 53 on the Artificial Analysis index as read that day; Argon standard price $4/$20 from December 1, 2026)