Argon Towers Over Opus 5.5 with $0.23 Eiffel Tower Victory
Key Summary
Gemini 4 Argon, a brain-training AI model from Google DeepMind, has outperformed Anthropic's Claude Opus 5.5 in building a scaled-down Eiffel Tower, with costs of $0.23 and $33.45 respectively, highlighting the gap between cost per token and real-world performance.
Beyond the Tower: Benchmarks and Specs
Google DeepMind unveiled Gemini 4 Argon on September 30, 2026. The model became generally available on October 13, 2026. Anthropic had shipped Claude Opus 5.5 just days earlier, on September 22, 2026.
The Eiffel Tower Showdown, by the Numbers
What makes the gap interesting is that it can't be explained by sticker prices alone. Gemini 4 Argon launched with introductory pricing of $2 per million input tokens and $10 per million output tokens. That rate runs until November 30, 2026.
Claude Opus 5.5 lists at $4 per million input tokens and $20 per million output tokens. Anthropic's pricing represents a 20% decrease from its previous rates. So on a per-token basis, Argon is half the price of Opus 5.5.
A Model That Nails It on the First Pass Burns Far Fewer Tokens
Half price does not get you to 145x. The rest of the gap comes from how much work each model did to reach the finish line. A model that nails a task on the first pass burns far fewer tokens than one that iterates for two hours, and tokens are what you pay for.
Why a $0.23 Tower Matters
The Eiffel Tower result reframes the competition around cost per task rather than cost per token. A model with a lower per-token price can still be the expensive option if it needs many more passes to finish the job.
Opus 5.5 already cut its prices by 20%. If a rival can finish certain jobs on the first try, list-price cuts may not close the gap on real workloads.
Argon's $2 and $10 rates are introductory and expire on November 30, 2026. Any enterprise budgeting around that figure should plan for what happens after the promotion ends.