Claude Haiku 4.5 vs o3-mini
Claude Haiku 4.5 vs o3-mini: Claude Haiku 4.5 is cheaper for input-heavy usage ($1.00/M vs $1.10/M input tokens), while o3-mini is better for long-context tasks (500,000 tokens).
Direct answer: choose Claude Haiku 4.5 for lower token spend and choose o3-mini when your workload needs longer context.
Compare input and output token pricing, context windows, and monthly cost estimates on one page so you can pick the cheaper model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Claude Haiku 4.5
o3-mini
Cost Differences
o3-mini costs less than Claude Haiku 4.5
Quick Recommendation
Winner for direct API pricing: o3-mini. At the default workload, o3-mini saves about $0.60/month ($7.30/year) versus Claude Haiku 4.5.
Feature Comparison
| Feature | Claude Haiku 4.5 | o3-mini |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input Price | $1.00/1M tokens | $1.10/1M tokens |
| Output Price | $5.00/1M tokens | $4.40/1M tokens |
| Context Window | 200,000 tokens | 500,000 tokens |
| Max Output | 64,000 tokens | 65,536 tokens |
| Category | efficient | reasoning |
| Capabilities | textvision | textreasoningcode |
| Release Date | 10/15/2025 | 1/31/2025 |
Claude Haiku 4.5 vs o3-mini: Which Should You Choose?
Choosing between Claude Haiku 4.5 and o3-mini depends on your priorities: cost efficiency, context length, or raw capability. o3-mini is the more affordable option at $1.10/1M input tokens. Meanwhile, o3-mini offers a significantly larger context window at 500,000 tokens vs 200,000 for Claude Haiku 4.5.
These models come from different providers — Anthropic and OpenAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to OpenAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: Claude Haiku 4.5 is a efficient model while o3-mini is reasoning. This means they're optimized for different workloads. o3-mini targets more demanding workloads, while Claude Haiku 4.5 provides a cost-effective option for everyday tasks.
Output costs matter too. Claude Haiku 4.5 charges $5.00/1M output tokens vs $4.40 for o3-mini. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. o3-mini has the edge here at $4.40/1M output tokens.
Multimodal capabilities: Claude Haiku 4.5 supports vision (image inputs) while o3-mini is text-only. If your application needs image understanding, this narrows your choice.
Best Use Cases
Choose Claude Haiku 4.5 when:
- • Budget is a primary concern
- • You're already using Anthropic's API ecosystem
- • You're running high-volume, latency-sensitive workloads
Choose o3-mini when:
- • You need a larger context window (500,000 tokens)
- • You need more capabilities (reasoning, code)
- • You need longer outputs (up to 65,536 tokens)
- • You're already using OpenAI's API ecosystem
Pros and Caveats at a Glance
Claude Haiku 4.5
- • Input pricing: $1.00/M tokens
- • Output pricing: $5.00/M tokens
- • Context window: 200,000 tokens
- • Max output: 64,000 tokens
Watch out for
- • Higher output cost than o3-mini
- • Smaller context window than o3-mini
o3-mini
- • Input pricing: $1.10/M tokens
- • Output pricing: $4.40/M tokens
- • Context window: 500,000 tokens
- • Max output: 65,536 tokens
Watch out for
- • Higher input cost than Claude Haiku 4.5
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Claude Haiku 4.5 (Anthropic)
o3-mini (OpenAI)
Start using Claude Haiku 4.5 today
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Sign Up for OpenAI →Frequently Asked Questions
Which is cheaper, Claude Haiku 4.5 or o3-mini?▼
What is the context window difference between Claude Haiku 4.5 and o3-mini?▼
Which model is better for AI Chatbot?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare Anthropic and OpenAI API pricing beyond this model matchup?▼
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