AI models / Compare
Claude Opus 5.5 vs Gemini 4 Argon
Claude Opus 5.5: Anthropic's recommended starting model, for long-running agentic coding and knowledge work. Gemini 4 Argon: Google's flagship reasoning model for complex software engineering, math and science, and autonomous agents.
| Spec | Claude Opus 5.5 | Gemini 4 Argon |
|---|---|---|
| Provider | Anthropic | |
| API model ID | claude-opus-5-5 | gemini-4-argon |
| API price (standard) | $4.00 in / $20.00 out per 1M tokens | $2.00 in / $10.00 out per 1M tokens |
| Pricing note | Batch API is 50% off. | Through Nov 30, 2026; $4.00 in / $20.00 out from Dec 1, 2026. Not on the free tier. |
| Context window | 1M tokens | Not stated |
| Max output | 128K tokens | Not stated |
| Weights | Closed (API only) | Closed (API only) |
Figures from each provider's official docs, checked 2026-10-15. Benchmarks and real-world quality vary by task, so test both on your own prompts.