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: o3 Mini High
Anthropic: Claude Haiku 4.5 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
OpenAI o3-mini-high is the same model as [o3-mini](/openai/o3-mini) with reasoning_effort set to high. o3-mini is a cost-efficient language model optimized for STEM reasoning tasks, particularly excelling in science, mathematics, and codi…
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Haiku 4.5 | OpenAI: o3 Mini High | 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 | $1.10 | 🏆 Anthropic: Claude Haiku 4.5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $5.00 | $4.40 | 🏆 OpenAI: o3 Mini High |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 Anthropic: Claude Haiku 4.5 |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Haiku 4.5 better than OpenAI: o3 Mini High?
Anthropic: Claude Haiku 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 Haiku 4.5 and OpenAI: o3 Mini High?
Input: $1.00 vs $1.10 per 1M tokens. Output: $5.00 vs $4.40 per 1M tokens.
What context windows do Anthropic: Claude Haiku 4.5 and OpenAI: o3 Mini High support?
Anthropic: Claude Haiku 4.5 supports up to 200K tokens. OpenAI: o3 Mini High supports up to 200K tokens.
Do both Anthropic: Claude Haiku 4.5 and OpenAI: o3 Mini High support tool calling?
Anthropic: Claude Haiku 4.5: yes. OpenAI: o3 Mini High: yes.