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GitHub Copilot Makes Gemini 4 Hydrogen Generally Available Across VS Code, CLI, Coding Agent and More at Provider List Pricing; Six Models Including Claude Fable 5, Gemini 3.8 Flash, Grok 4.6 and Kimi K3 Retire December 14

In its official changelog on November 13, GitHub announced that Gemini 4 Hydrogen, Google's latest Flash model, is generally available in GitHub Copilot for Copilot Pro, Pro+, Max, Business and Enterprise users. It appears in the model picker in VS Code, Visual Studio, Copilot CLI, the Copilot coding agent, the Copilot app, github.com, GitHub Mobile, JetBrains IDEs, Xcode, Eclipse and the Copilot SDK, with a gradual rollout and usage-based billing at provider list pricing. GitHub says the model is built for fast, efficient agentic coding, tool use and multistep workflows, with better instruction following than Gemini 3.8 Flash. The same day GitHub posted a deprecation notice: on December 14, 2026, Claude Fable 5, Claude Haiku 4.5, Gemini 3.8 Flash, Gemini 4 Argon, Grok 4.6 and Kimi K3 will be removed from all Copilot experiences, with suggested replacements.

Key Takeaways

Gemini 4 Hydrogen is generally available in GitHub Copilot for Pro, Pro+, Max, Business and Enterprise users, with a gradual rollout (GitHub Changelog)
Wide coverage: it shows up in the model picker in VS Code, Visual Studio, Copilot CLI, the Copilot coding agent, the Copilot app, github.com, iOS/Android, JetBrains IDEs, Xcode, Eclipse and the Copilot SDK
Billing is usage-based at provider list pricing; under default model enablement it is turned on automatically for Business and Enterprise unless an admin disables it in the Copilot model policy
Six models retire on December 14 with suggested replacements: Claude Fable 5 to Fable 5.2, Claude Haiku 4.5 to Haiku 5.5, Gemini 3.8 Flash to Gemini 4 Hydrogen, Gemini 4 Argon to Gemini 4 Carbon, Grok 4.6 to Grok 4.7, and Kimi K3 to be announced (deprecation notice)
Exception: individual Copilot subscribers on annual plans keep access to Claude Haiku 4.5

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Linked Models & Agents:

⚡ Gemini 4 Hydrogen ⚡ Claude Fable 5 ⚡ Claude Haiku 4.5 ⚡ Gemini 3.8 Flash ⚡ Gemini 4 Argon ⚡ Grok 4.6 ⚡ Kimi K3 🤖 GitHub Copilot 🤖 Copilot CLI 🤖 Copilot coding agent 🌐 GitHub 🌐 Microsoft 🌐 Google

#GitHub Copilot#Gemini 4 Hydrogen#model deprecation#AI coding#Pricing

Google DeepMind@GoogleDeepMind·Collected 3d ago

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Google Launches Gemini 4 Hydrogen: Scores 51 on the Artificial Analysis Intelligence Index, Above Argon, Runs 2.5x Faster Than 3.8 Flash and Lifts Terminal-Bench 4.1 From 18.2% to 57%; $1.50/$7.50 per Million Tokens, Free Tier Included

At 02:02 Singapore time on November 13, the official Google DeepMind, Google AI and Gemini accounts announced Gemini 4 Hydrogen, and the Gemini API changelog lists it as generally available under the model ID gemini-4-hydrogen. By Google's own numbers it scores 51 on the Artificial Analysis Intelligence Index at its default high thinking level, above Gemini 4 Argon at 50, and reaches 54 at a new xhigh level. It finishes tasks 2.5x faster than Gemini 3.8 Flash and lifts Terminal-Bench 4.1 from 18.2% to 57%. Pricing is flat across the 1M-token context at $1.50 input and $7.50 output per million tokens, and the model is also on the free tier. It becomes the default model in the Gemini app, Google Search and the Antigravity managed agent. The SKU price-list leak we covered yesterday is now officially confirmed. Cursor then officially said Hydrogen is in the editor, scoring 54.3% on CursorBench 4.0 at default high effort, up from 39.6% for Gemini 3.8 Flash.

Key Takeaways

Official figures: 51 on the Artificial Analysis Intelligence Index at default high thinking, above Gemini 4 Argon at 50; the new xhigh level reaches 54
2.5x faster than Gemini 3.8 Flash, Terminal-Bench 4.1 up from 18.2% to 57%, fabricated claims cut by more than 5x
Pricing: $1.50 input and $7.50 output per million tokens, flat across the 1M-token context, and available on the free tier
New Orchestrator in Antigravity switches between Carbon and Hydrogen: near-Carbon success on Terminal-Bench 4.0 with 24% less quota and 19% faster
Partner tests on graph, SQL and data-heavy enterprise work: 2x to 2.8x faster than 3.8 Flash with 12% to 23% fewer tokens
Cursor: official announcement that Hydrogen is in the editor; on CursorBench 4.0 it scores 54.3% at default High (about $5.59 per task), up from 39.6% for Gemini 3.8 Flash; Medium is 46.7% (about $1.76) and Low 27.9% (about $0.28); it is a third-party model and is not included in Cursor plan usage (Cursor docs, CursorBench)

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Linked Models & Agents:

⚡ Gemini 4 Hydrogen ⚡ Gemini 4 Argon ⚡ Gemini 4 Carbon ⚡ Gemini 3.8 Flash 🤖 Google Antigravity 🌐 Google 🌐 Google DeepMind 🌐 Artificial Analysis 🌐 Cursor

#Google#Gemini#Gemini 4 Hydrogen#Model Release#Pricing#Terminal-Bench#Antigravity#Agentic Coding#Cursor

AI Tracker Bot@aitrackerbot·Collected 3d ago

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X Debate: Unannounced Gemini 4 Hydrogen Shows Up on Google Cloud's Official SKU List at $1.50 Input and $7.50 Output per Million Tokens, 62.5% Below Gemini 4 Carbon's December Price, as Trackers Say It Already Answers on Vertex AI

On the afternoon of November 12 (Singapore time), model tracker AI Tracker Bot (@aitrackerbot) posted that calling gemini-4-hydrogen on Vertex AI's global endpoint returned HTTP 200 and that the model described itself as "Gemini 4 Hydrogen, a large language model built by Google." The post drew about 58K views and 361 likes. Earlier, Google AI Studio lead Logan Kilpatrick posted the single word "Gemini," which drew about 475K views and 846 replies. Users then found billing entries for Gemini 4 Hydrogen on Google Cloud's public SKU page: text input at $1.50 per million tokens, output at $7.50 and cached input at $0.075. We checked Google's SKU page and the prices match, but the Gemini API models and pricing pages still have no Hydrogen entry and Google has made no announcement. The debate is over whether this is the Flash tier of Gemini 4 and whether the price is competitive.

Key Takeaways

Google Cloud's official SKU page (Gemini API service) lists Gemini 4 Hydrogen: $1.50 for text, image and audio input, $7.50 for text output and $0.075 for cached input, per million tokens, global region
Tiered rates: $0.75 for batch and flex input, $3.75 for batch output, and $2.70 for priority input, about 1.8x the standard rate
Against the official pricing page, Gemini 4 Carbon costs $2/$10 now and $4/$20 from December 1; Hydrogen is 62.5% below the December price and matches Gemini 3.8 Flash's $1.50/$7.50 list price from January 1, 2027
The "200 on Vertex AI with self-identification" claim comes from @aitrackerbot (about 58K views) and could not be reproduced by us; Google has published no context length, release date or benchmark
Logan Kilpatrick's one-word "Gemini" post drew about 475K views and 5,114 likes, but it names no model

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Linked Models & Agents:

⚡ Gemini 4 Hydrogen ⚡ Gemini 4 Carbon ⚡ Gemini 4 Argon ⚡ Gemini 3.8 Flash 🌐 Google 🌐 Google DeepMind

#X discussion#Gemini 4 Hydrogen#Google Cloud#Vertex AI#Pricing#Leak