Claude Haiku 4.5 Pro vs Gemini 3 Flash Vision: which model should you choose?
We compared Claude Haiku 4.5 Pro and Gemini 3 Flash Vision on price, context window and 12 benchmarks. Gemini 3 Flash Vision has the stronger average benchmark score; Claude Haiku 4.5 Pro 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
Gemini 3 Flash Vision
Gemini 3 Flash Vision is a multimodal model from Google DeepMind. It offers a 400,000-token context window, costs $15.06 per million input tokens and $82.14 per million output tokens, and averages 81.9 across the index's benchmark suite.
- Input
- $15.06 / 1M
- Output
- $82.14 / 1M
- Context
- 400,000
- Avg score
- 81.9
- Open weights
- No
Specification comparison
| Spec | Claude Haiku 4.5 Pro | Gemini 3 Flash Vision | Edge |
|---|---|---|---|
| Input price / 1M | $15.07 | $15.06 | B |
| Output price / 1M | $73.96 | $82.14 | A |
| Context window | 1,000,000 | 400,000 | A |
| Max output | 8,192 | 32,768 | B |
| Average score | 80.8 | 81.9 | B |
| Arena Elo | 1436.2 | 1430.3 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Claude Haiku 4.5 Pro wins 3, Gemini 3 Flash Vision wins 8, and 1 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude Haiku 4.5 Pro | Gemini 3 Flash Vision | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 81.5 | 81.8 | 0.3 | Gemini 3 Flash Vision |
| GPQA Diamond | 75.7 | 75.7 | 0.0 | Tie |
| SWE-bench Verified | 70.4 | 71.4 | 1.0 | Gemini 3 Flash Vision |
| HumanEval | 86.0 | 84.5 | 1.5 | Claude Haiku 4.5 Pro |
| MATH-500 | 83.7 | 87.5 | 3.8 | Gemini 3 Flash Vision |
| AIME 2025 | 80.1 | 82.4 | 2.3 | Gemini 3 Flash Vision |
| LiveCodeBench | 72.4 | 73.2 | 0.8 | Gemini 3 Flash Vision |
| IFEval | 90.1 | 86.9 | 3.2 | Claude Haiku 4.5 Pro |
| TruthfulQA | 84.1 | 85.5 | 1.4 | Gemini 3 Flash Vision |
| HellaSwag | 89.3 | 91.5 | 2.2 | Gemini 3 Flash Vision |
| MMMU | 75.3 | 80.3 | 5.0 | Gemini 3 Flash Vision |
| Arena Elo | 1436.2 | 1430.3 | 5.9 | Claude Haiku 4.5 Pro |
Price analysis
On a blended 3:1 input-to-output basis, Claude Haiku 4.5 Pro costs about $29.79 per million tokens and Gemini 3 Flash Vision costs about $31.83. Claude Haiku 4.5 Pro is roughly 6% cheaper than Gemini 3 Flash Vision. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Claude Haiku 4.5 Pro has the larger context window at 1,000,000 tokens, compared with 400,000 for Gemini 3 Flash Vision. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude Haiku 4.5 Pro wins 3, Gemini 3 Flash Vision wins 8, and 1 are tied. On the index average, Gemini 3 Flash Vision leads Claude Haiku 4.5 Pro by 1.1 points (81.9 versus 80.8).
The price picture favours Claude Haiku 4.5 Pro. The context picture favours Claude Haiku 4.5 Pro. 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 Gemini 3 Flash Vision for quality-sensitive work and Claude Haiku 4.5 Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Claude Haiku 4.5 Pro if
- Unit cost matters and you want the cheaper blended price.
- You need the larger 1,000,000-token context window.
Choose Gemini 3 Flash Vision if
- You want the higher average benchmark score in this index.
- You need the larger 32,768-token output limit.
FAQ
Is Claude Haiku 4.5 Pro better than Gemini 3 Flash Vision?
On the index average, Gemini 3 Flash Vision leads Claude Haiku 4.5 Pro by 1.1 points (81.9 versus 80.8). The better choice depends on price, context and your task. Claude Haiku 4.5 Pro wins 3 benchmarks, Gemini 3 Flash Vision wins 8.
Which is cheaper, Claude Haiku 4.5 Pro or Gemini 3 Flash Vision?
Claude Haiku 4.5 Pro is cheaper on a blended 3:1 basis at about $29.79 per million tokens, versus $31.83 for Gemini 3 Flash Vision.
Which has the larger context window?
Claude Haiku 4.5 Pro has the larger context window at 1,000,000 tokens. Gemini 3 Flash Vision has 400,000 tokens.
Are these models open weights?
Claude Haiku 4.5 Pro is proprietary; Gemini 3 Flash Vision is proprietary.
Which should I choose for production?
If you need a single default, start with Gemini 3 Flash Vision for quality-sensitive work and Claude Haiku 4.5 Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.