Direct answer: Gemini 4 Argon is a model from Google. 96.4% on GPQA Diamond, per Epoch AI. On OpenRouter, US$ 2.00 per 1 million input tokens and US$ 10.00 per 1 million output tokens.
✓ Good for
technical reasoning on science topics (#1 of 198 on GPQA Diamond)
calculation and problems with an exact answer (#6 of 186 on OTIS Mock AIME)
the ceiling of reasoning on research-level math (#12 of 86 on FrontierMath (tiers 1 to 3))
answering short facts with little invention (#2 of 87 on SimpleQA Verified)
technical reasoning as the model appears through the API (#1 of 135 on GPQA Diamond (OpenRouter))
agents that follow rules and use tools (#12 of 131 on τ-bench Verified (airline))
very long documents or code (a window of 1 million tokens or more, according to OpenRouter)
✕ Not the best for
when the input budget sits at the top of the table (input price in the highest 25% on OpenRouter)
This block follows a rule of this section, using source data: if the model is in the top 25% of the metric, the item goes under "Good for"; if it is in the bottom half, it goes under "Not the best for". The middle band appears in neither. Price and context use OpenRouter; scores use Epoch AI or OpenRouter Benchmarks, in the latest version we checked.
Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch. Family and version were grouped by rule from the name.