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Claude Fable 5.2 vs Gemini 4 Hydrogen

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Free to try, no account needed. You see each answer’s cost and speed.

At a glance

Longer bar means the bigger number.

Open or closed · can you download the model and run it yourself?

Claude Fable 5.2Closed · only through Anthropic’s API or a cloud that resells it
Gemini 4 HydrogenClosed · only through Google’s API or a cloud that resells it

Blended price · per 1M tokens, lower is better

Claude Fable 5.2$16
Gemini 4 Hydrogen$3

Where they sit among all 45 models

Up and to the left is smarter for less money. Hover or tap a dot for its numbers, then click it to compare that model with Claude Fable 5.2.

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Rank by
Intelligence: the Artificial Analysis Intelligence Index. Price: blended per 1M tokens, 3 parts input to 1 part output. Lines at $2 blended and the median score (38.4). The dashed line joins the best value models: nothing cheaper scores higher.

Which one to pick

Pick Gemini 4 Hydrogen if

  • you want the lower bill ($3 vs $16 per 1M tokens blended)
  • you need to send video and audio

See how they answer your prompt

How smart is each one?

Every intelligence score we have

Out of 100, higher is better. Claude Fable 5.2 Gemini 4 Hydrogen

Gemini 4 Hydrogen has no Artificial Analysis scores yet, so only our own tests compare them.

Benchmarks

  • Factual knowledge · SimpleQA

  • Competition math · OTIS Mock AIME

  • Research math · FrontierMath

Test them on your own question

The specs

Spec Claude Fable 5.2 Gemini 4 Hydrogen
Input price$8 per 1M$1.50 per 1M
Output price$40 per 1M$7.50 per 1M
Cost per test task$17.94$9.84
Context window1M1.05M
Max output128K66K
AcceptsText, Image, PDFText, Image, Video, Audio, PDF
Open weightsNoNo
LabAnthropicGoogle
ReleasedNov 2026Nov 2026
Knowledge cutoffJun 2026Mar 2026

Blended price weighs 3 parts input to 1 part output. List prices from models.dev. Cost per test task from Vals AI.

Questions

Is Claude Fable 5.2 or Gemini 4 Hydrogen cheaper?

Gemini 4 Hydrogen is cheaper. It charges $1.50 per 1M input tokens and $7.50 per 1M output tokens, against $8 and $40 for Claude Fable 5.2. Blended 3 parts input to 1 part output, that is $3 against $16 per 1M tokens.

Are Claude Fable 5.2 and Gemini 4 Hydrogen open source?

No. Both are closed models: the weights aren't published, so you can only use them through an API, from Anthropic and Google or a cloud that resells them.

Which has the longer context window?

They are about the same: Claude Fable 5.2 accepts 1M tokens and Gemini 4 Hydrogen 1.05M.

Can I compare Claude Fable 5.2 and Gemini 4 Hydrogen on my own prompt?

Yes. ModelCompare sends one prompt to both models at once and shows each answer side by side with what it cost. You can try it free without an account.

Still deciding? Send one prompt to both and read the answers side by side, with what each one cost. Compare Claude Fable 5.2 and Gemini 4 Hydrogen →

Where the numbers come from

Intelligence Index and benchmark scores are from Artificial Analysis, at each model’s highest effort, except the Epoch Capabilities Index, SimpleQA, OTIS Mock AIME and FrontierMath, which are from Epoch AI, and the Uncensored score, which is from the UGI Leaderboard, and CursorBench, which is from Cursor, and FrontierCode, which is from Cognition at each model’s best-scoring effort. The hallucination test is ours: questions with one exact answer, fake evidence pushed against right answers and requests that tempt a model to name packages that don’t exist. Prices are list prices from models.dev. Example answers come from our own test runs. Updated November 13, 2026.