Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding…
Model details →Anthropic: Claude Opus 4.5 vs Google: Gemini 3.1 Pro Preview
Google: Gemini 3.1 Pro Preview wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation …
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 4.5 | Google: Gemini 3.1 Pro Preview | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 200K | 1.0M | 🏆 Google: Gemini 3.1 Pro Preview |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $5.00 | $2.00 | 🏆 Google: Gemini 3.1 Pro Preview |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $25.00 | $12.00 | 🏆 Google: Gemini 3.1 Pro Preview |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Opus 4.5 better than Google: Gemini 3.1 Pro Preview?
Google: Gemini 3.1 Pro Preview wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Opus 4.5 and Google: Gemini 3.1 Pro Preview?
Input: $5.00 vs $2.00 per 1M tokens. Output: $25.00 vs $12.00 per 1M tokens.
What context windows do Anthropic: Claude Opus 4.5 and Google: Gemini 3.1 Pro Preview support?
Anthropic: Claude Opus 4.5 supports up to 200K tokens. Google: Gemini 3.1 Pro Preview supports up to 1.0M tokens.
Do both Anthropic: Claude Opus 4.5 and Google: Gemini 3.1 Pro Preview support tool calling?
Anthropic: Claude Opus 4.5: yes. Google: Gemini 3.1 Pro Preview: yes.