Gemini 3.5 Flash vs Gemini 4 Argon
| Spec | Gemini 3.5 Flash | Gemini 4 Argon |
|---|---|---|
| Respan Index | 44.4 (#48) | 69.1 (#8) |
| Blended price per 1M | $1.69 | $2 |
| Context window | 1.0M | - |
| Input / output per 1M | $0.75 / $4.5 | $1 / $5 |
| Max output | 66K | 1M |
| Input | text, vision, audio | text, vision, video |
| Released | 2026-05-19 | 2026-09-30 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | Gemini 3.5 Flash | Gemini 4 Argon |
|---|---|---|
| Coding | 19.4 Gemini 3.5 Flash | 55.9 Gemini 4 Argon |
| Agents | 49.8 Gemini 3.5 Flash | 77.1 Gemini 4 Argon |
| Reasoning | 50.1 Gemini 3.5 Flash | 78.1 Gemini 4 Argon |
| Knowledge & language | 65.7 Gemini 3.5 Flash | 76.0 Gemini 4 Argon |
| Human preference | 53.5 Gemini 3.5 Flash | 58.3 Gemini 4 Argon |
Benchmarks both report
Gemini 4 Argon leads on 14 of the 14 benchmarks both report. Higher is better. Each score links to where it was published.
| Benchmark | Gemini 3.5 Flash | Gemini 4 Argon |
|---|---|---|
| Chess Puzzles (Epoch AI) | 45% | 59% |
| LMArena Elo | 1478 | 1520 |
| LMArena WebDev (LMArena) | 1499 | 1679 |
| APEX-Agents (Mercor) | 27.5% | 82.4% |
| EBR-bench (Epoch AI) | 4.8% | 64.8% |
| FrontierMath Tier 4 v2 (Epoch AI) | 26.8% | 78% |
| FrontierMath Tiers 1-3 v2 (Epoch AI) | 62.8% | 86% |
| GPQA Diamond | 92.8% | 96.4% |
| Mystery Game Puzzles (Epoch AI) | 32% | 64% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 95.6% | 100% |
| SAGE (Vals AI) | 49.9% | 53.6% |
| SimpleQA Verified | 66.2% | 76% |
| Terminal-Bench 4.0 (Vals AI) | 6.1% | 57.6% |
| Vending-Bench 2 (Andon Labs) | 5396.42 | 13718.16 |
FAQ
Is Gemini 3.5 Flash better than Gemini 4 Argon?
Gemini 4 Argon scores 69.1 on the Respan Index (#8), ahead of Gemini 3.5 Flash at 44.4 (#48). Gemini 4 Argon leads on 14 of the 14 benchmarks both report.
Which is cheaper, Gemini 3.5 Flash or Gemini 4 Argon?
Gemini 3.5 Flash lists at $0.75 input and $4.5 output per 1M tokens; Gemini 4 Argon at $1 and $5. Gemini 3.5 Flash is 1.2x cheaper per token at list price.