Large Language Models

Gemini 4 Hydrogen vs Claude Fable 5.2: 5x Price Gap

Fable 5.2 costs $8 in and $40 out per million. Hydrogen costs $1.50 and $7.50 for the same volume. Fable leads computer use 89.3% to 77.6% on OSWorld 2.1. The two labs publish almost no overlapping benchmarks, so this compares what is actually comparable. Prices from both vendors, 13 November 2026.

🕐 8 min read 👁 10 views 📅 Nov 13, 2026

Gemini 4 Hydrogen

Fast execution model. $1.50/$7.50 per million, flat across a 1M context.

— / 10

$1.50 / $7.50 per 1M

Full Review →

Claude Fable 5.2

Deep reasoning and computer use. OSWorld 2.1 at 89.3%. $8/$40 per million.

— / 10

$8 / $40 per 1M

Full Review →

● Price gap: Fable 5.2 is $8 in / $40 out. Hydrogen is $1.50 / $7.50. Roughly 5.3x on both sides.
● They are built for different jobs: Fable is a deep reasoning model. Hydrogen is explicitly a fast execution model. Google says so in the announcement.
● Where Fable clearly leads: computer use — OSWorld 2.1 at 89.3% against 77.6%, and Chartography 73.4% to 66.6%.
● The honest caveat: the two labs publish mostly different benchmark suites, so most rows cannot be compared at all.

Claude Fable 5.2 shipped on 9 November, Gemini 4 Hydrogen on 12 November. Three days apart, and they are not competing for the same work — which is the useful thing to establish before looking at price.

What can actually be compared

Benchmark	Claude Fable 5.2	Gemini 4 Hydrogen
OSWorld 2.1, computer use	89.3%	77.6%
Chartography	73.4%	66.6%
Input / 1M tokens	$8.00	$1.50
Output / 1M tokens	$40.00	$7.50
Context pricing	not published	flat across 1M

Everything else does not line up. Anthropic publishes Fable on FrontierCode 2.0 (49.1% at xhigh), FrontierSWE v2 (69.9%), AutomationBench (51.4%), Terminal-Bench-Science 0.1 (74.6%) and Humanity’s Last Exam with tools (74.2%). Google publishes Hydrogen on Terminal-Bench 4.1 (57%), HLE-Diamond (58.8%), SWE-sweep (13.5%), Agents’ Last Exam v1.1 (71.6%) and the Vals benches. Almost no overlap, and where names look similar the versions differ.

Anyone showing you a tidy head-to-head table of these two is comparing different tests.

What the price difference actually buys

A workload burning 10M input and 3M output tokens a month costs $200 on Fable 5.2 and $37.50 on Hydrogen. On Fable’s faster tier at $16 and $80 it is $400.

So the question is not which is better. It is whether the specific task needs deep reasoning. If it does, Fable is the tool and the bill is the bill. If the task is execution — calling tools, moving data, following a defined process — you are paying five times over for reasoning depth the job never uses.

Which one, concretely

If you are…	Pick
Driving a computer or a browser	Fable 5.2. 89.3% on OSWorld 2.1 is a wide lead.
Reading charts, diagrams or documents	Fable 5.2, 73.4% on Chartography.
Running high-volume tool-calling agents	Hydrogen. The work does not need Fable and the bill does not survive it.
Doing scientific or long-horizon reasoning	Fable 5.2. That is what it was built for.
Latency-sensitive	Hydrogen, 2.5x faster than 3.8 Flash at default.
Running both	Route by task. The gap is wide enough to pay for the routing logic many times over.

Listings: Gemini 4 Hydrogen · Claude Fable 5.2.

Sources

● Google — Introducing Gemini 4 Hydrogen
● Anthropic — Claude Fable 5.2 and Mythos 5.2

⚖ Our Verdict

Fable 5.2 for computer use, chart reading and deep reasoning, and accept the bill. Hydrogen for high-volume tool-calling and anything latency-sensitive, at roughly a fifth the price. Route by task rather than standardising; the gap pays for the routing logic many times over.