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 OpenAI: o1
Anthropic: Claude Opus 4.5 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
The latest and strongest model family from OpenAI, o1 is designed to spend more time thinking before responding. The o1 model series is trained with large-scale reinforcement learning to reason using chain of thought. The o1 models are op…
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 4.5 | OpenAI: o1 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 200K | 200K | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $5.00 | $15.00 | 🏆 Anthropic: Claude Opus 4.5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $25.00 | $60.00 | 🏆 Anthropic: Claude Opus 4.5 |
| 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 OpenAI: o1?
Anthropic: Claude Opus 4.5 wins on 2 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 OpenAI: o1?
Input: $5.00 vs $15.00 per 1M tokens. Output: $25.00 vs $60.00 per 1M tokens.
What context windows do Anthropic: Claude Opus 4.5 and OpenAI: o1 support?
Anthropic: Claude Opus 4.5 supports up to 200K tokens. OpenAI: o1 supports up to 200K tokens.
Do both Anthropic: Claude Opus 4.5 and OpenAI: o1 support tool calling?
Anthropic: Claude Opus 4.5: yes. OpenAI: o1: yes.