Gemini 4 Hydrogen goes generally available in GitHub Copilot as GitHub retires six models
GitHub announced on November 13 that Gemini 4 Hydrogen is generally available in GitHub Copilot, a day after Google launched the model — a new distribution route beyond the Search, app and API rollout. In a separate changelog post the same day, GitHub said it will deprecate six models on December 14, 2026, including Gemini 3.8 Flash.
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The News
GitHub announced on November 13 that Gemini 4 Hydrogen is generally available in GitHub Copilot, a day after Google launched the model. “Generally available” means the feature is finished and open to all eligible users, not a limited test. This is a new distribution route for Hydrogen beyond the Search, app and API rollout covered when the model launched — it puts Google's newest model inside the coding assistant millions of developers already use every day.
It is available to Copilot Pro, Pro+, Max, Business and Enterprise users, selectable from the model picker in VS Code, Visual Studio, the Copilot CLI, the coding agent, the Copilot app, github.com, GitHub Mobile, JetBrains IDEs, Xcode, Eclipse and the Copilot SDK, with a gradual rollout — meaning it reaches users in waves rather than all at once. It bills at provider list rates under usage-based pricing, so users pay for what they use at Google's published prices. Business and Enterprise admins can block or allow Hydrogen through Copilot model policy; by default it ships enabled.
In a separate November 13 changelog post, GitHub said it will deprecate six models on December 14, 2026 — deprecate means the models will be retired and removed. The list includes Gemini 3.8 Flash, which Hydrogen replaces as the suggested alternative; Hydrogen is also the new default in Search and AI Mode. GitHub named Fable 5.1, Hydrogen, Carbon, Grok 4.7 and Haiku 5.5 among the replacements; Kimi K3's replacement is still to be announced.
Distribution is the battleground for AI models now, and Copilot is one of the biggest channels in software.
Why It Matters
Distribution is the battleground for AI models now, and Copilot is one of the biggest distribution channels in software. A model can be the best in the world, but if developers have to leave their editor to use it, most of them will not. Putting Hydrogen in the Copilot model picker — in VS Code, JetBrains, Xcode and the rest — means Google's newest model is one click away for the developers who write code for a living.
The retirement schedule shows how fast the model cycle is turning. Six models are being removed on December 14, barely a month after this announcement, and Hydrogen is the named replacement for Gemini 3.8 Flash. For users, that means model choices in Copilot are being refreshed on a timescale of weeks, not years — and for Google, it means Hydrogen inherits the default slot in Search and AI Mode that 3.8 Flash held.
The read-throughs cut both ways. For Google, Copilot distribution puts Hydrogen in front of Microsoft's developer base — a rival's customers. For Microsoft, which owns GitHub, offering Google's model inside Copilot is a bet that the best model wins, even when it comes from a competitor. The admin controls matter here too: Business and Enterprise customers can block Hydrogen, so adoption inside big companies will depend on IT departments, not just individual developers.
Analyst's Take
Our call is Bullish. Getting the newest Google model into GitHub Copilot a day after launch is the fastest possible route from announcement to developers' keyboards, and the December 14 retirement of six older models — with Hydrogen as the named replacement for Gemini 3.8 Flash — shows GitHub is actively clearing the shelf for it. That is distribution with intent, not a checkbox integration.
What to watch: the gradual rollout and the admin response. Hydrogen reaches users in waves, and Business and Enterprise admins can block it — so the signal is whether large customers leave it enabled and whether usage shifts from the retired models to Hydrogen after December 14. Microsoft is a read-through here: GitHub is Microsoft's, so Copilot adoption is the number to watch for MSFT, not a direct Google sale.
Reader poll — will you switch Copilot to Hydrogen? Vote: Yes, switching; Staying put; Trying both; or Not a user.
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By The Numbers
FAQ
Is this the same news as the Gemini 4 Hydrogen launch?
No. The Hydrogen launch itself was published November 13. This is a follow-up: GitHub announced on November 13 that Hydrogen is generally available in GitHub Copilot, a new distribution route, and in a separate changelog post the same day that six models will be retired on December 14.
Which Copilot plans get Hydrogen?
Copilot Pro, Pro+, Max, Business and Enterprise users. It is selectable from the model picker across VS Code, Visual Studio, the Copilot CLI, the coding agent, the Copilot app, github.com, GitHub Mobile, JetBrains IDEs, Xcode, Eclipse and the Copilot SDK, with a gradual rollout.
Which models are being retired?
Six models will be deprecated on December 14, 2026, including Gemini 3.8 Flash, which Hydrogen replaces as the suggested alternative; Hydrogen is also the new default in Search and AI Mode. GitHub named Fable 5.1, Hydrogen, Carbon, Grok 4.7 and Haiku 5.5 among the replacements; Kimi K3's replacement is still to be announced.
How does Hydrogen bill in Copilot?
At provider list rates under usage-based pricing — users pay for what they use at Google's published prices. Business and Enterprise admins can block or allow Hydrogen through Copilot model policy; by default it ships enabled.
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Source: GitHub