AI model comparison
Claude Haiku 4.5 vs o3 Mini
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Anthropic
Claude Haiku 4.5
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.
- Input / 1M
- $1
- Output / 1M
- $5
- Context
- 200K
OpenAI
o3 Mini
OpenAI o3-mini is a cost-efficient language model optimized for STEM reasoning tasks, particularly excelling in science, mathematics, and coding.
- Input / 1M
- $1.10
- Output / 1M
- $4.40
- Context
- 200K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
o3 Mini
1.0x cheaper for a typical chat
Higher intelligence score
Claude Haiku 4.5
16.9 vs 12.5 on Artificial Analysis
Larger context window
Tie
200K vs 200K tokens
Newer release
Claude Haiku 4.5
Released October 15, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Haiku 4.516.9o3 Mini12.5Coding index
Claude Haiku 4.543.9o3 MiniNot availableAgentic index
Claude Haiku 4.58o3 MiniNot availablePricing
Claude Haiku 4.5 vs o3 Mini API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Haiku 4.5 | o3 Mini |
|---|---|---|
| Input tokensPer 1M tokens | $1 | $1.10 |
| Output tokensPer 1M tokens | $5 | $4.40 |
| Cached input (read)Per 1M tokens | $0.10 | $0.55 |
| Cache writePer 1M tokens | $1.25 | Not available |
| Web searchPer request | $0.01 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Claude Haiku 4.5$4.50o3 Mini$4.40Coding task
30K in, 4K out
Claude Haiku 4.5$50$23 cachedo3 Mini$50.60$34.10 cachedLong document summary
150K in, 2K out
Claude Haiku 4.5$160$25 cachedo3 Mini$173.80$91.30 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Haiku 4.5 | o3 Mini |
|---|---|---|
| Context window | 200K tokens | 200K tokens |
| Max output | 64K tokens | 100K tokens |
| Input types | File, Image, Text | File, Text |
| Output types | Text | Text |
| Reasoning effort levels | Not available | Not available |
| Default reasoning effort | Not available | Not available |
| Release date | October 15, 2025 | January 31, 2025 |
Features
Supported features
API features available for each model.
| Metric | Claude Haiku 4.5 | o3 Mini |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Not supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Claude Haiku 4.5View full model details- Claude Haiku 4.5 vs Gemini 3.1 Flash Lite
- Claude Haiku 4.5 vs Gemini 2.5 Flash
- Claude Haiku 4.5 vs Claude Sonnet 4.5
- Claude Haiku 4.5 vs Gemini 2.5 Pro
- Claude Haiku 4.5 vs GLM 4.6
- Claude Haiku 4.5 vs o3
- Claude Haiku 4.5 vs Claude Sonnet 4
- Claude Haiku 4.5 vs Qwen3.5-122B-A10B
- Claude Haiku 4.5 vs o4 Mini
- Claude Haiku 4.5 vs Kimi K2 0905
- Claude Haiku 4.5 vs o1
- Claude Haiku 4.5 vs Mistral Medium 3.5
- Claude Haiku 4.5 vs Command A
- Claude Haiku 4.5 vs Sonar Reasoning Pro
o3 MiniView full model details- o3 Mini vs o4 Mini
- o3 Mini vs Gemini 2.5 Flash
- o3 Mini vs Mistral Medium 3.5
- o3 Mini vs R1 0528
- o3 Mini vs Command A
- o3 Mini vs GLM 4.5
- o3 Mini vs GPT-4.1
- o3 Mini vs Kimi K2 0711
- o3 Mini vs Qwen3 235B A22B Thinking 2507
- o3 Mini vs o1-pro
- o3 Mini vs Sonar Reasoning Pro
- o3 Mini vs o3 Mini High
- o3 Mini vs GPT-4.1 Mini
- o3 Mini vs GPT-4o (2024-11-20)
Our take
o3 Mini is 1.0x cheaper for a typical chat. Claude Haiku 4.5 scores higher on the Artificial Analysis Intelligence Index (16.9 vs 12.5). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Claude Haiku 4.5 or o3 Mini cheaper?
o3 Mini is cheaper for a typical chat (2K input tokens and 500 output tokens). o3 Mini costs $1.10 per 1M input tokens and $4.40 per 1M output tokens, while Claude Haiku 4.5 costs $1 per 1M input tokens and $5 per 1M output tokens.
Which has a bigger context window, Claude Haiku 4.5 or o3 Mini?
Claude Haiku 4.5 supports up to 200K tokens of context, compared with 200K for o3 Mini.
Is Claude Haiku 4.5 smarter than o3 Mini?
On the Artificial Analysis Intelligence Index, Claude Haiku 4.5 scores 16.9 and o3 Mini scores 12.5, putting Claude Haiku 4.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Claude Haiku 4.5 and o3 Mini at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Claude Haiku 4.5 and o3 Mini answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Claude Haiku 4.5 and o3 Mini at the same time. Compare the answers side by side and keep the best one.