Claude Haiku 4.5 is Anthropic’s fastest and most efficient model, delivering near-frontier intelligence at a fraction of the cost and latency of larger Claude models. Matching Claude Sonnet 4’s performance across reasoning, coding, and comp…
Model details →Anthropic: Claude Haiku 4.5 vs OpenAI: o1-pro
Anthropic: Claude Haiku 4.5 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
The o1 series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o1-pro model uses more compute to think harder and provide consistently better answers.
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Haiku 4.5 | OpenAI: o1-pro | 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. | $1.00 | $150.00 | 🏆 Anthropic: Claude Haiku 4.5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $5.00 | $600.00 | 🏆 Anthropic: Claude Haiku 4.5 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | — | 🏆 Anthropic: Claude Haiku 4.5 |
| 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 Haiku 4.5 better than OpenAI: o1-pro?
Anthropic: Claude Haiku 4.5 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Haiku 4.5 and OpenAI: o1-pro?
Input: $1.00 vs $150.00 per 1M tokens. Output: $5.00 vs $600.00 per 1M tokens.
What context windows do Anthropic: Claude Haiku 4.5 and OpenAI: o1-pro support?
Anthropic: Claude Haiku 4.5 supports up to 200K tokens. OpenAI: o1-pro supports up to 200K tokens.
Do both Anthropic: Claude Haiku 4.5 and OpenAI: o1-pro support tool calling?
Anthropic: Claude Haiku 4.5: yes. OpenAI: o1-pro: not advertised.