Gemini 4 Argon
Claude Opus 5.5
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Gemma 4 31B
Step 5 PreviewGemini 4 Argon vs Claude Opus 5.5
- Gemini 4 Argon rates higher on LMArena’s text leaderboard: 1526 against 1516.
- Gemini 4 Argon is cheaper: $2 / $10 per million input / output tokens, against $4 / $20 for Claude Opus 5.5.
- On the 11 Vals AI benchmarks both have taken, Gemini 4 Argon wins 4 and Claude Opus 5.5 wins 7 (Gemini 4 Argon: Vibe Code Bench, Legal Index, Legal Research Bench).
Side by side
Models (2/6)
- Gemini 4 Argon
- Claude Opus 5.5
| Benchmark | Gemini 4 Argon | Claude Opus 5.5 |
|---|---|---|
| The model | ||
| Lab | Anthropic | |
| Released | 2026-10-13 | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Input, per 1M tokens | $2 | $4 |
| Output, per 1M tokens | $10 | $20 |
| LMArena, people’s votes | ||
| LMArena TextMillions of people compare two anonymous models side by side and vote for the better answer | 1526#1 of 351 | 1516#2 of 351 |
| LMArena WebDevPeople ask two anonymous models to build the same web app, try both and vote for the better one | 1674#11 of 124 | 1807#1 of 124 |
| LMArena VisionSide-by-side votes on prompts that include an image | — | 1321#2 of 146 |
| LMArena CodingLMArena’s text votes on prompts that ask for code | 1539#2 of 346 | 1545#1 of 346 |
| LMArena MathLMArena’s text votes on math prompts | 1538#1 of 339 | 1518#6 of 339 |
| LMArena Creative writingLMArena’s text votes on stories, poems and other creative writing | 1523#2 of 349 | 1534#1 of 349 |
| LMArena Hard promptsLMArena’s text votes on the hardest prompts | 1538#1 of 351 | 1536#2 of 351 |
| LMArena Instruction followingLMArena’s text votes on prompts with specific instructions to follow | 1528#2 of 351 | 1539#1 of 351 |
| Vals AI, overall | ||
| Vals IndexVals AI’s headline score | 69.24%#3 of 27 | 70.18%#2 of 27 |
| Vals AI, coding | ||
| Terminal-Bench 4.0Frontier-difficulty tasks an agent completes in a real terminal | 57.58%#7 of 55 | 65.15%#1 of 55 |
| Vibe Code BenchBuilding complete web apps from a plain-language brief, graded on whether the app works | 91.91%#2 of 115 | 90.29%#5 of 115 |
| Code MigrationRewriting working programs in a new language, graded on whether the new program still passes its tests | 70.80%#6 of 28 | 81.01%#2 of 28 |
| Vals AI, finance | ||
| Finance AgentThe core tasks of a financial analyst, done as an agent with research tools | 67.66%#2 of 31 | 67.85%#1 of 31 |
| Finance IndexVals AI’s composite of finance tasks | 64.89%#2 of 31 | 65.59%#1 of 31 |
| Tax Agent BenchAgentic research into US corporate tax questions | 44.56%#5 of 76 | 45.57%#3 of 76 |
| Vals AI, law | ||
| Legal IndexVals AI’s composite of legal tasks | 76.72%#2 of 28 | 72.33%#7 of 28 |
| Legal Research BenchAgentic US legal research | 54.81%#4 of 85 | 50.48%#7 of 85 |
| Vals AI, medicine | ||
| MedCodeAssigning the right medical billing codes from clinical notes | 58.80%#3 of 107 | 49.80%#19 of 107 |
| Vals AI, reasoning | ||
| Terminal-Bench ScienceExpert-written scientific research workflows, run by an agent in a terminal | 44.29%#5 of 42 | 47.14%#3 of 42 |
Add models in the compare tool. Vals Index: Gemini 4 Argon 69.24%, Claude Opus 5.5 70.18%.
Questions
Which is better, Gemini 4 Argon or Claude Opus 5.5?
Gemini 4 Argon rates higher on LMArena’s text leaderboard: 1526 against 1516. Gemini 4 Argon is cheaper: $2 / $10 per million input / output tokens, against $4 / $20 for Claude Opus 5.5. On the 11 Vals AI benchmarks both have taken, Gemini 4 Argon wins 4 and Claude Opus 5.5 wins 7 (Gemini 4 Argon: Vibe Code Bench, Legal Index, Legal Research Bench).
Which is cheaper, Gemini 4 Argon or Claude Opus 5.5?
Gemini 4 Argon is cheaper: $2 / $10 per million input / output tokens, against $4 / $20 for Claude Opus 5.5.