# Gemini 4 Flash Release Date: Hydrogen and Hyperion Leaks

> Gemini 4 Flash is not announced. What the Hydrogen arena tests and the Hyperion entry in Devin's model list show, and what Google has said.

- Author: Nitish Garg, Founder & CEO, CellCog
- Published: 2026-11-08
- Canonical (HTML): https://cellcog.ai/blog/gemini-4-flash-release-date/
- Section: Guides / Choosing a platform
- Publisher: CellCog (https://cellcog.ai), the AI employee platform. Blog index for agents: https://cellcog.ai/blog/llms.txt

## Key points

- Google has not announced Gemini 4 Flash; its November 2 recap names Gemini 4 Argon and Carbon only.
- Hyperion, a new model family with minimal to high effort levels, appeared in Devin builds listed just before Gemini 4 Argon, per two trackers on November 8.
- Hydrogen, reported as Gemini 4 Flash's codename since October 27, is said to be in LMArena and AI Studio tests at 300 to 500 tokens per second; no one has measured that independently.
- The November 18 release estimates on X come with no source; Google has given no date.
- Google's current Flash model, Gemini 3.8 Flash, costs $0.75 and $3.75 per million tokens through December 31, 2026.

## At a glance

- **Is Gemini 4 Flash out?** No. Google has not announced it as of November 8, 2026. Its newest Flash model is Gemini 3.8 Flash, released September 2.
- **What is Hyperion?** A model family with five effort variants that trackers found in Devin builds on November 8, listed just before Gemini 4 Argon. Its maker is unconfirmed.
- **What is Hydrogen?** The codename X posts have given Gemini 4 Flash since October 27, reportedly tested on LMArena and in AI Studio. Google has not confirmed it.

Google has not announced Gemini 4 Flash. As of November 8, 2026, two codenames point at it: Hydrogen, which leak-watchers on X say Google has been testing on LMArena and in AI Studio since late October, and Hyperion, a new model family that turned up in builds of Cognition's Devin, listed just before Gemini 4 Argon.

Neither name comes from Google or Cognition. Below: what each sighting shows, what Google has actually said, whether Hydrogen and Hyperion are the same model, and what would settle it.

## What we actually know

*Table: What is confirmed about Gemini 4 Flash, November 8, 2026*

| Claim | Source | Status |
|---|---|---|
| Google is shipping more Gemini 4 models | Google's October recap, November 2 | Confirmed for Argon and Carbon; no Flash model named |
| Gemini 4 Flash is codenamed Hydrogen | X posts since October 27, collected by OfficeChai | Reported, not confirmed |
| Five Hydrogen checkpoints at 300 to 500 tokens per second | X posts, November 4 | Reported, not measured independently |
| Hydrogen is in A/B tests on LMArena and AI Studio | X posts, November 4 | Reported |
| A Hyperion model family sits in Devin builds | X posts, November 8 | Seen by two accounts; nothing from Cognition |
| Hyperion is Gemini 4 Flash | Its place in the model list | A guess |
| Release around November 18 | Two X accounts | No source given |

## What Google has said

Google's October roundup, published November 2, covers Gemini 4 Argon and Gemini 4 Carbon. It says the company "released one frontier model globally and announced our next one just two weeks later." It names no Flash model and no Hydrogen.

Google's newest Flash model is still Gemini 3.8 Flash, released September 2 at $0.75 per million input tokens and $3.75 per million output tokens through December 31, 2026, then $1.50 and $7.50. Our [Gemini 3.8 Flash record](https://cellcog.ai/blog/gemini-3-8-flash/) has the detail, and our [Gemini 4 page](https://cellcog.ai/blog/gemini-4-release-date/) tracks Argon and Carbon.

## Hydrogen: the arena sightings

OfficeChai traced the name to an October 27 post by Pankaj Kumar: "Gemini 4 Flash is in internal testing under the codename Hydrogen." On November 4, two more accounts said five new Hydrogen checkpoints had appeared, with speeds of 300 to 500 tokens per second, and that the model was in A/B tests on AI Studio and LMArena. Google has not commented, and no one has published an independent speed measurement.

The most shared test came on November 6. One tester caught Hydrogen in an arena battle on a motion graphics prompt and timed it against Gemini 3.8 Flash on the same prompt.

That is one prompt and one run each, timed by hand, so read it as a sign of speed rather than a benchmark.

## Hyperion: the Devin sighting

The second name surfaced on November 8. An account that tracks Devin builds went through Saturday's desktop build, 3.12.1028, and wrote that hyperion was "new since the Oct 30 build" with minimal to high effort levels: "It's listed among the Gemini models, right before Gemini 4 Argon, so possibly Google." Its own verdict: nothing confirmed.

Five hours later another tracker reported the same family in Devin CLI v3000.12.17, with five variants, hyperion, hyperion-minimal, hyperion-low, hyperion-medium and hyperion-high, placed between Gemini 3.5 Flash Lite and Gemini 4 Argon: "This makes me think Hyperion could be Gemini 4 Flash although it's still unconfirmed." That is the post that spread.

![Animation: a Devin model list gains an amber hyperion row between Gemini 3.5 Flash Lite and Gemini 4 Argon; an arena card shows Hydrogen with a speed gauge at 300-500 tok/s reported; dashed lines join both to a Gemini 4 Flash? pill beside a card reading Google: no Flash announced.](https://cellcog.ai/blog/media/gemini-4-flash-release-date/hyperion.svg)
*Two unconfirmed codenames, one in a model list and one in arena tests.*

What we could check ourselves: Cognition's public model page lists Gemini 4 Argon and Gemini 3.7 and 3.8 Flash, and no Hyperion. Its SDK guide names a bundled CLI build, 3000.11.1, and we found no release note for 3000.12.17. The same build also carries a second unattributed codename, wyvern, with low, xhigh and max effort levels.

## Are Hydrogen and Hyperion the same model?

Possibly, but nothing ties them together yet. The position fits: Hyperion sits among Devin's Gemini entries, below Argon, where a Flash model would go. The name does not: Google has named its Gemini 4 models after elements, Argon and Carbon, and Hydrogen fits that pattern; Hyperion does not. Hyperion may be a label Cognition gave to a preview it is testing, as other codenames in Devin builds this week appear to be. If it is a Google model, it could also be something other than Flash.

## When could it ship?

There is no date. The November 18 estimates on X come with no source. For pacing, Google released Gemini 4 Argon on September 30 and announced Gemini 4 Carbon on October 28. A model showing up in arena tests and in a partner's build is often a sign that a launch is weeks away, not months, but Google has not said so.

## Where CellCog sits

Our conflict, declared: every CellCog tier runs on Claude Opus 5.5, Anthropic's model, and we do not route to Gemini today. We track Flash-class launches because a fast, cheap model resets what every agent product can afford to do in a loop, ours included.

## What would settle it

- **Google naming it.** A Google or DeepMind post, or a gemini-4-flash model id in the Gemini API docs or AI Studio.
- **A listing elsewhere.** An OpenRouter or Vertex AI entry with matching speed and price.
- **Cognition.** A Devin release note naming Hyperion's maker, or the model appearing on its public model page.
- **LMArena.** A published score for Hydrogen under its real name.

## Sources

- Google: [The latest AI news we announced in October](https://blog.google/innovation-and-ai/technology/ai/google-ai-updates-october-2026/), November 2, 2026.
- OfficeChai: [Google Preparing To Release A Flash Model Named Gemini 4 Hydrogen, X Users Say](https://officechai.com/ai/gemini-4-hydrogen/), November 5, 2026.
- @aitrackerbot on [X](https://x.com/aitrackerbot/status/2119294910629138470), November 8, 2026, 05:04 UTC.
- @Mr_Salio on [X](https://x.com/Mr_Salio/status/2119371442898747486), November 8, 2026, 10:08 UTC.
- @deweytn on [X](https://x.com/deweytn/status/2118809236046246316), November 6, 2026, 20:54 UTC.
- Cognition: [AI Models](https://docs.devin.ai/desktop/models) and [Local Devin sessions with the SDK](https://docs.devin.ai/sdk/guides/local-sessions), read November 8, 2026.

## FAQ

**When will Gemini 4 Flash be released?**

Google has given no date. Two X accounts estimate around November 18 without citing a source.

**Is Hyperion the same as Hydrogen?**

Unknown. Hyperion's place in Devin's list fits a Flash model, but Google names its Gemini 4 models after elements and Hyperion breaks that pattern.

**How fast is Hydrogen?**

X posts report 300 to 500 tokens per second. One tester timed a motion graphics prompt at about 2 minutes against about 11 for Gemini 3.8 Flash. Neither is an independent benchmark.

**What will Gemini 4 Flash cost?**

Google has published no price. Gemini 3.8 Flash costs $0.75 per million input tokens and $3.75 per million output tokens through December 31, 2026, then $1.50 and $7.50.

**Does CellCog use Gemini Flash?**

Not today. Every CellCog tier runs on Claude Opus 5.5.

## Related

- [Gemini 4 Argon: Release, Price and Access](https://cellcog.ai/blog/gemini-4-release-date/index.md)
- [Gemini 4 Carbon: Benchmarks, Price and Access](https://cellcog.ai/blog/gemini-4-carbon/index.md)
- [Gemini 3.8 Flash vs 3.7: Benchmarks, Price, Cyber Variant](https://cellcog.ai/blog/gemini-3-8-flash/index.md)

## The AI employee for this read

[AI Software Engineer](https://cellcog.ai/ai-employees/ai-software-engineer): I built this page. For what it covers, hire an engineer: it works in your repo behind an approval gate, so nothing reaches your world unclassified.

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