Gemini 4 Krypton vs Claude Fable 5.2: Specs, Tests, Price

2x Code Output vs 69.9% FrontierSWE v2: Comparing Gemini 4 Krypton and Claude Fable 5.2

Gemini 4 Krypton is an unreleased Google DeepMind checkpoint that early testers rate about even with Claude Fable 5.2 on visual and creative coding. Claude Fable 5.2 is the one you can use today, and it comes with system-card numbers such as 69.9% on FrontierSWE v2. The right pick depends on whether you need a model you can call now or are planning around Google's next flagship. As of November 14, 2026, Gemini 4 Krypton has no price, no API model ID, no context-window figure and no benchmark scores. Everything known about it comes from Arena demos and tester posts.

Key Takeaways

• Only one of the two is available. Claude Fable 5.2 is out now. Gemini 4 Krypton is still at its first checkpoint, called krypton-a, and Google has not announced it.
• Visual quality looks close in early tests. One same-prompt test on November 14, 2026 was judged "neck and neck." Another tester said Krypton's visuals still trail Fable 5.2.
• Krypton works longer on each answer. Testers report about 2x the runtime and 2x the code of Gemini 4 Carbon, with single demo runs of 15–22 minutes.
• Fable 5.2 has numbers you can compare. A circulated system-card table gives Fable 5.2 69.9% on FrontierSWE v2 and 89.3% on OSWorld 2.1. No equivalent figures exist for Krypton.
• Cost can't be compared yet. Krypton has no price. The only figure in circulation, $4/$20 per 1M tokens, was explicitly a guess.

Gemini 4 Krypton vs Claude Fable 5.2 at a Glance

Dimension	Gemini 4 Krypton	Claude Fable 5.2
Developer	Google DeepMind (per community reports)	Anthropic
Status (Nov 14, 2026)	Internal checkpoint (krypton-a); no announcement	Released and available to the public
Public API model ID	Not yet confirmed	Available through Anthropic's API (see official docs)
Price per 1M tokens (in/out)	Not yet confirmed ($4/$20 is a community guess)	$8 / $40 on one third-party listing; Anthropic's official price not reproduced here
FrontierSWE v2	Unverified, no public number yet	69.9% (circulated system-card table)
OSWorld 2.1	Unverified, no public number yet	89.3% (circulated system-card table)
Context window	Not yet confirmed	Unverified, no public number in available sources
Typical long creative-coding run	15–22 minutes per demo (community reports)	Not yet confirmed

The table reflects an imbalance that will last until Google ships. Fable 5.2 has a scorecard, while Krypton is known mostly through demo videos.

Status and Availability

Claude Fable 5.2 launched alongside Claude Mythos 5.2. Coverage such as WorldofAI's launch roundup describes both as officially available. Every's early hands-on review passed 47K views within four days. Developers who want Fable 5.2 today can go through Anthropic's app and API, and it is also listed as Claude Fable 5.2 on kie.ai.

Gemini 4 Krypton has a different history. Talk of it started around November 8–9, 2026, when an X account named Lyra posted that Google had an internal checkpoint "even better than Carbon." The same day, developer Chetaslua posted a side-by-side comparison of Krypton, Carbon and Argon and labeled the build krypton-a, the first checkpoint, according to AGTP's summary of the comparison. By November 14, testers said Krypton was reachable on Arena under the Hydrogen Alias, the gemini-4-hydrogen name. One tester recorded a checkpoint ID observed at 11:28 PM PT on November 13.

Who is behind that alias is still disputed. LuminaBench posted a 15-minute output and added that it was "not sure if it is definitely Krypton." Our earlier explainer on Gemini 4 Hydrogen covers why Hydrogen is generally treated as a separate Flash-class model.

The practical difference is simple: Claude Fable 5.2 can go into production today, and Gemini 4 Krypton can't be called at all.

Benchmarks: A Scorecard vs Demo Reels

Fable 5.2's numbers come from a system-card evaluation table that circulated in mid-November 2026. Treat them as reported, not independently reproduced. The table puts Fable 5.2 against Gemini 4 Carbon, which is Krypton's predecessor and the nearest stand-in for it:

Benchmark (circulated system-card table)	Claude Fable 5.2	Gemini 4 Carbon	Gemini 4 Krypton
FrontierSWE v2	69.9%	61.2%	Not yet confirmed
FrontierCode 2.0 (Xhigh)	49.1%	41.1%	Not yet confirmed
AutomationBench	51.4%	53.9%	Not yet confirmed
OSWorld 2.1	89.3%	81.5%	Not yet confirmed
AA-Briefcase v1.1	66.1% (1785 Elo)	Not in table	Not yet confirmed

The same table puts Fable 5.2 up from 56.3% on FrontierSWE v2 for Fable 5.1. That 13.6-point gain is the main number behind Fable's agentic-coding reputation. Carbon's 53.9% on AutomationBench is the one row where Google comes out ahead.

Krypton does not appear in any of these benchmarks. Testers say it "beats Carbon," but you can't turn that into a score. Even if Krypton clears Carbon's 61.2% on FrontierSWE v2, nothing public shows whether it gets near Fable's 69.9%. Until Google publishes evaluations, any claim that Krypton beats Fable 5.2 on coding benchmarks is speculation.

Capabilities: Creative Coding and the Double-Effort Behavior

Visual and creative coding is the one area where the two models have been tested on the same prompts. On November 14, 2026, Mr_Salio's Same-Prompt Duel judged Krypton and Fable 5.2 "genuinely neck and neck."

Other testers disagree. xbquan said Krypton's visuals still trailed Fable but praised its audio. StatsWire claimed better 3D and SVG output and possibly stronger code-generated audio than both Fable 5.2 and GPT-6 Astra. Neither post includes a scoring method. Given how far these tester verdicts diverge, the community read is best described as a split.

Krypton's demos have a recognizable pattern, which this page calls the Double-Effort Behavior. The original krypton-a comparison found it taking about twice as long as Carbon and writing about twice as much code. Single runs reported by testers include:

• An interactive 3D sailing ship generated zero-shot in 22m20s (abhinavflac).
• A voxel castle with 386,661 voxels built in under 20 minutes (LuminaBench).
• A single-file HTML plus Three.js robot arm with zero external 3D models (HarshithLucky3).

Krypton's checkpoints are also not uniformly better. Adidotdev's three-way comparison gave Krypton the edge on lighting, smoke and water. It gave Carbon the edge on town layout. Our Gemini 4 Krypton explainer follows how the krypton-a build first appeared.

For agentic coding, computer use and business workflows, there is no Krypton evidence of any kind. Fable 5.2 is the only side with a record there.

Pricing and Token Cost

Neither price can be confirmed from available sources. One third-party API listing shows Claude Fable 5.2 at $8 per 1M input tokens and $40 per 1M output tokens, at about 101 tokens/s. Check Anthropic's own pricing page before you budget. Community discussion, including the Gemini 4 Carbon vs Fable 5.2 value debate, already treats Fable as the premium-priced option.

Krypton has no price. A $4/$20 per 1M token figure has circulated, but its author called it a guess. For reference, Carbon launched at an introductory $2/$10 per 1M tokens, set to double to $4/$20 after November 30.

Krypton's per-token rate may matter less than the Thinking-Token Gap. In one tester's comparison graphic, Krypton used about 22,000 thinking tokens on a single PS4-controller SVG prompt, against roughly 4,000 for Carbon. Google bills thinking tokens as output. A model that thinks 5x longer can cost more per task even at a lower per-token price.

Which One Should You Use?

Choose Claude Fable 5.2 if:

• You need a model in production this week. Krypton has no API model ID.
• Your workload is agentic coding or computer use, where Fable's circulated 69.9% FrontierSWE v2 and 89.3% OSWorld 2.1 scores are the only numbers on record.
• You need numbers you can show procurement or a review board, not demo videos.

Choose Gemini 4 Krypton (once it ships) if:

• Your main use is creative coding: 3D scenes, detailed SVGs or code-generated audio, where early demos look competitive.
• You can accept 15–22 minute runs in exchange for more thorough output.
• You are already on Google's stack and want the successor to Carbon. Our overview of the Gemini 4 family explains how the lineup fits together.

Frequently Asked Questions

Is Gemini 4 Krypton better than Claude Fable 5.2?

No public evidence shows that it is yet. One same-prompt visual test on November 14, 2026 rated the two neck and neck. Another tester said Krypton's visuals still trail Fable 5.2 but praised its audio. Neither model has a published head-to-head benchmark against the other.

Is Gemini 4 Krypton cheaper than Claude Fable 5.2?

Nobody can say, because Google has not priced Krypton. The $4/$20 per 1M token figure in circulation was explicitly a guess. A third-party listing shows Fable 5.2 at $8/$40 per 1M tokens, but that has not been checked against Anthropic's official pricing.

Can I use Gemini 4 Krypton today?

Not through any official channel. Krypton has no API model ID, no price and no announcement. Testers report reaching a checkpoint only on Arena, under the gemini-4-hydrogen alias.

What benchmarks does Claude Fable 5.2 have versus Gemini 4 Krypton?

Fable 5.2 has circulated scores of 69.9% on FrontierSWE v2, 49.1% on FrontierCode 2.0 (Xhigh), 89.3% on OSWorld 2.1 and 51.4% on AutomationBench. Krypton has no published benchmark scores. Its evidence is visual demos and runtime reports.

Why does Gemini 4 Krypton take so long to answer?

According to early testers, it spends about twice as long as Gemini 4 Carbon and writes about twice as much code. Demo runs of 15–22 minutes have been reported. One graphic showed about 22,000 thinking tokens for Krypton against roughly 4,000 for Carbon on one prompt.

Is Gemini 4 Hydrogen the same as Gemini 4 Krypton?

Probably not. Hydrogen is widely described as a separate Flash-class model. Several testers believe the Hydrogen entry on Arena has been routing to a Krypton checkpoint, though some say they are unsure. Google has not confirmed the routing.

When will Gemini 4 Krypton be released?

Google has not announced a date. A single Reddit-sourced claim gives November 25, 2026 for an early "Cyber Defenders" group and December 8, 2026 for public availability. That schedule is unconfirmed.

What to Watch Next

Three signals will settle most of this comparison. The first is an official Google model card for Krypton with FrontierSWE v2 or OSWorld scores, which would allow a direct comparison with Fable's 69.9% and 89.3%. The second is a published Krypton price, read alongside its thinking-token usage per task. The third is confirmation of what the gemini-4-hydrogen alias on Arena actually routes to, because that decides which of the current demos really belong to Krypton. This page will be updated as each of these arrives.

Try related models on Kie.ai: Claude Fable 5.2 (Coming Soon), Gemini 4 Carbon and Gemini 4 Hydrogen.