Claude Haiku 4.5 Pro vs o3 Vision: which model should you choose?
We compared Claude Haiku 4.5 Pro and o3 Vision on price, context window and 12 benchmarks. o3 Vision has the stronger average benchmark score; o3 Vision is cheaper on a blended 3:1 basis.
Claude Haiku 4.5 Pro
Claude Haiku 4.5 Pro is a multimodal model from Anthropic. It offers a 1,000,000-token context window, costs $15.07 per million input tokens and $73.96 per million output tokens, and averages 80.8 across the index's benchmark suite.
- Input
- $15.07 / 1M
- Output
- $73.96 / 1M
- Context
- 1,000,000
- Avg score
- 80.8
- Open weights
- No
o3 Vision
o3 Vision is a multimodal model from OpenAI. It offers a 1,000,000-token context window, costs $15.24 per million input tokens and $65.25 per million output tokens, and averages 81.8 across the index's benchmark suite.
- Input
- $15.24 / 1M
- Output
- $65.25 / 1M
- Context
- 1,000,000
- Avg score
- 81.8
- Open weights
- No
Specification comparison
| Spec | Claude Haiku 4.5 Pro | o3 Vision | Edge |
|---|---|---|---|
| Input price / 1M | $15.07 | $15.24 | A |
| Output price / 1M | $73.96 | $65.25 | B |
| Context window | 1,000,000 | 1,000,000 | Tie |
| Max output | 8,192 | 8,192 | Tie |
| Average score | 80.8 | 81.8 | B |
| Arena Elo | 1436.2 | 1436.5 | B |
| Open weights | No | No | Tie |
Benchmark comparison
Claude Haiku 4.5 Pro wins 2, o3 Vision wins 10, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude Haiku 4.5 Pro | o3 Vision | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 81.5 | 83.6 | 2.1 | o3 Vision |
| GPQA Diamond | 75.7 | 77.8 | 2.1 | o3 Vision |
| SWE-bench Verified | 70.4 | 71.8 | 1.4 | o3 Vision |
| HumanEval | 86.0 | 85.6 | 0.4 | Claude Haiku 4.5 Pro |
| MATH-500 | 83.7 | 84.4 | 0.7 | o3 Vision |
| AIME 2025 | 80.1 | 82.4 | 2.3 | o3 Vision |
| LiveCodeBench | 72.4 | 73.7 | 1.3 | o3 Vision |
| IFEval | 90.1 | 89.3 | 0.8 | Claude Haiku 4.5 Pro |
| TruthfulQA | 84.1 | 85.8 | 1.7 | o3 Vision |
| HellaSwag | 89.3 | 89.7 | 0.4 | o3 Vision |
| MMMU | 75.3 | 75.7 | 0.4 | o3 Vision |
| Arena Elo | 1436.2 | 1436.5 | 0.3 | o3 Vision |
Price analysis
On a blended 3:1 input-to-output basis, Claude Haiku 4.5 Pro costs about $29.79 per million tokens and o3 Vision costs about $27.74. o3 Vision is roughly 7% cheaper than Claude Haiku 4.5 Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Both models list a 1,000,000-token context window. That is enough for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude Haiku 4.5 Pro wins 2, o3 Vision wins 10, and 0 are tied. On the index average, o3 Vision leads Claude Haiku 4.5 Pro by 1.0 points (81.8 versus 80.8).
The price picture favours o3 Vision. The context picture is effectively a tie. Those two dimensions often matter more than a few benchmark points once a model is good enough for the task.
If you need a single default, start with o3 Vision for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Claude Haiku 4.5 Pro if
- You prefer Anthropic's tooling or already use it.
Choose o3 Vision if
- You want the higher average benchmark score in this index.
- Unit cost matters and you want the cheaper blended price.
- The workload needs multi-step reasoning.
FAQ
Is Claude Haiku 4.5 Pro better than o3 Vision?
On the index average, o3 Vision leads Claude Haiku 4.5 Pro by 1.0 points (81.8 versus 80.8). The better choice depends on price, context and your task. Claude Haiku 4.5 Pro wins 2 benchmarks, o3 Vision wins 10.
Which is cheaper, Claude Haiku 4.5 Pro or o3 Vision?
o3 Vision is cheaper on a blended 3:1 basis at about $27.74 per million tokens, versus $29.79 for Claude Haiku 4.5 Pro.
Which has the larger context window?
Both models list a 1,000,000-token context window.
Are these models open weights?
Claude Haiku 4.5 Pro is proprietary; o3 Vision is proprietary.
Which should I choose for production?
If you need a single default, start with o3 Vision for quality-sensitive work, and check whether its price holds at your expected volume before committing.