All tasks / Comparisons
Claude Opus 5.5 vs Gemini 4 Argon
Compared only on public benchmark results, across the 5 tasks where both are listed: Claude Opus 5.5 is a tier higher in 1 of 5 shared tasks, Gemini 4 Argon in 1, they share a tier in 2.
Claude Opus 5.5
Anthropic's Opus-tier Claude model for long-running agentic coding and knowledge work.
- Vendor
- Anthropic
- Weights
- Closed: API and apps only
- Released
- 22 Sep 2026
- API price
- $4 in / $20 out per 1M tokens
- License
- proprietary
- Last verified
- 18 Oct 2026
Gemini 4 Argon
Google's flagship Gemini reasoning model with a 1M-token context window, labeled stable in the Gemini API.
- Vendor
- Weights
- Closed: API and apps only
- Released
- 13 Oct 2026
- API price
- $2 in / $10 out per 1M tokens
- License
- proprietary
- Last verified
- 18 Oct 2026
Task by task
| Task | Claude Opus 5.5 | Gemini 4 Argon | Higher tier |
|---|---|---|---|
| Chat & assistants Models | S1,508 on LMArena Text Arena (overall, style control) · Cloud | S1,524 on LMArena Text Arena (overall, style control) · Cloud | Same tier |
| Writing Models | S1,519 on LMArena Text Arena: Creative Writing (style control) · Cloud | S1,516 on LMArena Text Arena: Creative Writing (style control) · Cloud | Same tier |
| Coding Models | S1,806 on LMArena WebDev / Code Arena (overall) · Cloud | B1,678 on LMArena WebDev / Code Arena (overall) · Cloud | Claude Opus 5.5 |
| Browser & computer agents Models | –No public result yet · Cloud | –No public result yet · Cloud | — |
| Workflow automation Models | A69.5% on AutomationBench-AA (Artificial Analysis) · Cloud | S77.5% on AutomationBench-AA (Artificial Analysis) · Cloud | Gemini 4 Argon |
A tier spans a range of scores, and small gaps on a leaderboard are often within its margin of error, so only a different tier counts as ahead. How we rank.
Same benchmark, both results
| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | Snapshot |
|---|---|---|---|
| Artificial Analysis Intelligence Index Composite index over Artificial Analysis' own evaluation suite, higher is better | 58 | 53 | 18 Oct 2026 |
| AutomationBench-AA (Artificial Analysis) Score: average share of each task's objectives completed across 657 business-workflow tasks in 40 simulated SaaS apps via REST APIs; a task with any guardrail (business-rule) violation scores zero, higher is better | 69.5% | 77.5% | 19 Oct 2026 |
| LMArena Text Arena (overall, style control) Arena score (Bradley-Terry rating from pairwise human votes, style-controlled default view), higher is better | 1,508 | 1,524 | 15 Oct 2026 |
| LMArena Text Arena: Creative Writing (style control) Arena score (Bradley-Terry rating from pairwise human votes, creative-writing prompts only, style-controlled view), higher is better | 1,519 | 1,516 | 15 Oct 2026 |
| LMArena WebDev / Code Arena (overall) Arena score (Bradley-Terry rating from pairwise human votes on web-app generation), higher is better | 1,806 | 1,678 | 18 Oct 2026 |