Gemini 2.5 Pro vs Gemini 4 Hydrogen
Gemini 4 Hydrogen and Gemini 2.5 Pro score 87.3% vs 57.6% averaged across five Vision Evals tasks (#3 and #46 of 69 models), so Gemini 4 Hydrogen leads overall.
- Gemini 4 Hydrogen wins all 5 tasks, with its widest lead on object detection (81.0% vs 33.7%).
- Gemini 2.5 Pro is about half the cost: $0.0051 vs $0.0094 overall average cost per sample.
- Gemini 2.5 Pro is faster: 6.8s vs 13.2s per sample.
Roboflow Vision Evals. Full breakdown below.
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Gemini 2.5 Pro vs Gemini 4 Hydrogen on Vision Evals
Roboflow Vision Evals. Full breakdown below.
Gemini 2.5 Pro vs Gemini 4 Hydrogen Comparison Table
Evals updated November 12, 2026Pricing updated November 13, 2026
| Property | Gemini 2.5 Pro | Gemini 4 Hydrogen |
|---|---|---|
| Organization | ||
| Category | closed | closed |
| Modality | multimodal | multimodal |
| Release Date | Jun 2025 | Nov 2026 |
| Context Window | 1.0M | 1.0M |
| Parameters | Unknown | Unknown |
| License | Proprietary | Proprietary |
| Commercial use | commercial use per vendor terms | commercial use per vendor terms |
| Pricing per 1M tokens | ||
| Input $/1M | $1.25 | No published price |
| Output $/1M | $10.00 | No published price |
| Vision Tasks | ||
| Chart Question Answering | Supported | Not listed |
| Document Question Answering | Supported | Not listed |
| Image Tagging | Supported | Not listed |
| Multi-Label Classification | Supported | Not listed |
| Promptable Concept Segmentation | Not listed | Demo |
Both support 6 more tasks | ||
| Model Features | ||
Both support 3 more features | ||
Vision Evalsground-truth scores across 5 vision tasks, pooled at low effort | ||
| Overall | 57.6% | 87.3% |
| Avg cost / sample | $0.0051 | $0.0094 |
| Avg speed / sample | 6.83s | 13.23s |
| By task | ||
| Object Detection (low) | 33.7% | 81.0% ±0.8, Mean of 3 runs, range 80.3 to 81.9 |
| Object Detection (high) | – | 83.3% ±0.7, Mean of 3 runs, range 82.4 to 83.8 |
| Counting (low) | 52.7% | 83.8% ±2.0, Mean of 3 runs, range 82.4 to 86.5 |
| Counting (high) | – | 84.2% ±2.7, Mean of 3 runs, range 82.4 to 87.8 |
| Identification (low) | 93.8% | 96.9% ±0.0, Mean of 3 runs, range 96.9 to 96.9 |
| Identification (high) | – | 96.9% ±0.0, Mean of 3 runs, range 96.9 to 96.9 |
| OCR (low) | 65.2% | 86.7% |
| by category |
|
|
| OCR (high) | 64.6% | 87.2% |
| by category |
|
|
| Reasoning (low) | 42.4% | 88.1% ±0.7, Mean of 3 runs, range 87.4 to 88.7 |
| Reasoning (high) | 62.3% | 91.8% ±0.3, Mean of 3 runs, range 91.4 to 92.0 |
Gemini 2.5 Pro vs Gemini 4 Hydrogen: Overview
Gemini 2.5 Pro, released on June 17, 2025, is Google DeepMind’s most capable model in the Gemini 2.5 family, optimized for deep reasoning, coding, and complex multimodal tasks. It accepts text, images, audio, video, and PDFs as input and outputs text. The model supports 1 million input tokens with an output capacity of up to 65K tokens, enabling large-scale comprehension of datasets, codebases, and technical documents. Its training knowledge extends to January 2025.
It supports structured outputs, function calling, code execution, search grounding, and URL context, making it well-suited for enterprise, STEM, and developer workflows. However, it does not currently support image or audio generation in its stable release, and its higher computational cost and latency make it less efficient than Flash or Flash-Lite. It is available via the Gemini API, Google AI Studio, and Vertex AI.
Gemini 4 Hydrogen is a multimodal model from Google, positioned as a successor to Gemini 3.8 Flash with stronger agent and coding capabilities at Flash-class speed.
Frequently Asked Questions
On Roboflow's Vision Evals, Gemini 4 Hydrogen performed better. It scores higher on all five vision tasks and averages 87.3% (#3 of 69) against 57.6% (#46 of 69) for Gemini 2.5 Pro. These scores measure vision capabilities only; either model may perform differently on work outside this benchmark's tasks.
No. On the Vision Evals Object Detection benchmark at low effort, Gemini 4 Hydrogen leads with 81.0% against 33.7%. This is the widest gap between the two models across the benchmark's tasks.
Gemini 2.5 Pro is cheaper to run. Across Roboflow's Vision Evals task mix it averaged $0.0051 per sample against $0.0094. Actual costs depend on your image sizes, prompts, and output length.
Gemini 2.5 Pro is faster. Across Roboflow's Vision Evals it averaged 6.8s per inference against 13.2s. Latency varies with image size, prompt length, and provider load, so treat these as relative rather than guaranteed figures.
Yes. The comparison demo on this page runs both models on the same image side by side for object detection and open prompts in the free Roboflow Playground. You can try it instantly, and a free account unlocks unlimited runs.