o3-mini vs Claude Haiku 4.5: Detailed Comparison
Choosing between o3-mini (OpenAI) and
Claude Haiku 4.5 (Anthropic) comes down to three things:
per-token pricing, context window, and which capability matters most for your workload.
o3-mini costs $1.10/M input vs
$1.00/M for Claude Haiku 4.5;
context windows are 200K vs
200K tokens. Detailed breakdown below.
Side-by-side specs
| Spec | o3-mini | Claude Haiku 4.5 |
|---|
| Provider | OpenAI | Anthropic |
|---|
| Released | 2025-01-31 | 2025-10-01 |
|---|
| Input price |
$1.10/M |
$1.00/M |
| Output price |
$4.40/M |
$5.00/M |
| Cached input |
$0.5500/M |
$0.1000/M |
| Context window |
200K |
200K |
| Max output |
100K |
16K |
| Modalities |
text |
text image |
| Tokenizer |
o200k_base |
claude-3 |
Capability matrix
| Capability | o3-mini | Claude Haiku 4.5 |
|---|
| function calling |
Yes |
Yes |
| json mode |
Yes |
Yes |
| reasoning |
Yes |
No |
| vision |
No |
Yes |
| streaming |
No |
Yes |
| tool use |
No |
Yes |
Per-call cost on typical workloads
| Workload (in/out tokens) | o3-mini | Claude Haiku 4.5 | Cheaper by |
|---|
| Standard chat (1K / 500) |
$0.003300 |
$0.003500 |
o3-mini by $0.000200 |
| RAG (4K / 500) |
$0.006600 |
$0.006500 |
Claude Haiku 4.5 by $0.000100 |
| Long doc (20K / 1K) |
$0.026400 |
$0.025000 |
Claude Haiku 4.5 by $0.001400 |
| Very long context (100K / 2K) |
$0.116600 |
$0.107500 |
Claude Haiku 4.5 by $0.009100 |
When to choose o3-mini over Claude Haiku 4.5
- Supports reasoning — Claude Haiku 4.5 does not.
When to choose Claude Haiku 4.5 over o3-mini
- Per-token input cost is 9% lower than o3-mini.
- Supports vision — o3-mini does not.
- Supports streaming — o3-mini does not.
- Supports tool use — o3-mini does not.
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