Gemini 1.5 Flash vs GPT-4o mini: Fast, Low-Cost AI for Developers
Comparing Google's Gemini 1.5 Flash and OpenAI's GPT-4o mini. Detailed breakdown of 1,000,000 token context window, native video/audio understanding, pricing ($0.075 vs $0.15), and latency.
Quick Verdict
Gemini 1.5 Flash is the clear winner for document processing, video/audio summarization, and ultra-low cost ($0.075/M input). GPT-4o mini is preferred for high-speed conversational chatbots and applications requiring strict JSON schema adherence.
When building production AI applications, developers frequently choose between Google's Gemini 1.5 Flash and OpenAI's GPT-4o mini. Gemini 1.5 Flash offers a massive 1 Million token context window and native video/audio ingestion at $0.075 per million input tokens, while GPT-4o mini provides high text generation speed and mature developer tooling.
Models at a Glance
Gemini 1.5 Flash
by Google
Included in Gemini Free / Advanced
Gemini Advanced
GPT-4o mini
by OpenAI
Free / Plus ($20/mo)
ChatGPT Plus
Capabilities Comparison
| Capability | Gemini 1.5 Flash | GPT-4o mini |
|---|---|---|
| Text Generation | ||
| Code Generation | ||
| Image Generation | ||
| Vision / Image Understanding | ||
| Video Generation | ||
| Audio / Voice Generation | ||
| Web Browsing / Search | ||
| Code Execution | ||
| Function Calling | ||
| Structured Output (JSON) | ||
| Advanced Reasoning (CoT) | ||
| File Upload & Analysis | ||
| Fine-Tuning | ||
| Plugins / Extensions | ||
| Memory / History | ||
| Agentic Capabilities | ||
| Custom Bots |
Use Case Ratings
Gemini 1.5 Flash
GPT-4o mini
Benchmark Scores
| Benchmark | Gemini 1.5 Flash | GPT-4o mini |
|---|---|---|
| MMLU (Knowledge) | 78.9% | 82.0% |
| MMLU-Pro | 68.2% | 64.8% |
| HumanEval (Coding) | 74.3% | 87.2% |
| GPQA (Graduate Q&A) | 38.5% | 40.2% |
| MATH (Competition) | 62.4% | 70.2% |
| GSM8K (Grade Math) | 86.5% | 91.0% |
| ARC (Reasoning) | 92.1% | 92.8% |
| HellaSwag | 91.0% | 91.5% |
| MT-Bench | 8.80 | 8.85 |
| LMSYS Arena ELO | 1250 | 1272 |
| SWE-Bench | 22.5% | 13.1% |
Feature-by-Feature Comparison
| Feature | Gemini 1.5 Flash | GPT-4o mini |
|---|---|---|
| Context Window Capacity | 1,000,000 tokens (8x Larger) | 128,000 tokens |
| API Input Pricing per 1M Tokens | $0.075 / M (50% Cheaper) | $0.15 / M |
| Video & Audio Direct Upload | Yes (Native 1hr video / audio) | No (Image only) |
| Python Coding (HumanEval Benchmark) | 74.3% | 87.2% (Top Score) |
Pricing Comparison
| Plan | Gemini 1.5 Flash | GPT-4o mini |
|---|---|---|
| Free Version | ||
| Subscription | Included in Gemini Free / Advanced | Free / Plus ($20/mo) |
| API Input (1M tokens) | $0.075 | $0.15 |
| API Output (1M tokens) | $0.30 | $0.60 |
Pros & Cons
Gemini 1.5 Flash
✅ Pros
- Massive 1,000,000 token context window (8x larger than GPT-4o mini)
- Native video and audio understanding (can ingest full 1-hour recordings)
- Cheapest input pricing: $0.075 per 1M tokens (50% cheaper than mini)
- High-speed generation (~120 tokens/sec)
❌ Cons
- Slightly lower HumanEval code benchmark (74.3% vs 87.2%)
- Output token length limited to 8,192 tokens
GPT-4o mini
✅ Pros
- Higher coding accuracy on HumanEval (87.2% vs 74.3%)
- Faster output generation speed (~140 tokens/sec)
- Larger output buffer (up to 16,384 tokens)
- Reliable function calling with strict JSON mode
❌ Cons
- Smaller context window (128K vs 1.0M tokens on Flash)
- No native video or raw audio understanding
🏆 Who Wins in Each Category?
Best for Large Documents, Audio & Video
1 Million token context window with native video file analysis.
Best for Python Code & Scripting
87.2% HumanEval coding score with 16k output tokens.
Best Price-to-Performance Value
$0.075/M input is the most affordable in the industry.
Our Pick: Gemini 1.5 Flash
Gemini 1.5 Flash wins for general developer workflows due to its massive 1M context window, video/audio multimodal understanding, and industry-low $0.075/M input pricing.
Try Gemini 1.5 FlashLong Context & Multimodal Ingestion
When comparing Gemini 1.5 Flash and GPT-4o mini, the fundamental difference lies in multimodal capabilities and context volume:
- 1 Million Token Context Window: Gemini 1.5 Flash processes up to 1,000,000 tokens in a single request. Developers can upload entire code repositories, hours of call audio, or complete PDF textbooks.
- Video & Audio Modalities: Flash natively processes video frames and audio waveforms, allowing timestamps-based question answering on recordings.
- Coding & Math: GPT-4o mini demonstrates superior performance on algorithmic code synthesis (87.2% on HumanEval vs 74.3% on Flash) and competition math (70.2% on MATH vs 62.4%).
Developer Recommendation
- Choose Gemini 1.5 Flash for high-volume content extraction, meeting audio transcription and analysis, customer support log ingestion, and video intelligence.
- Choose GPT-4o mini for low-latency coding assistants, interactive conversational bots, and structured JSON generation.
Frequently Asked Questions
Can Gemini 1.5 Flash analyze video files directly?▼
Yes. Gemini 1.5 Flash natively accepts video files (up to 1 hour in length) via the Google AI Studio API and can answer questions about visual timestamps.
How much cheaper is Gemini 1.5 Flash than GPT-4o mini?▼
Gemini 1.5 Flash costs $0.075/M input and $0.30/M output, which is 50% cheaper on both input and output compared to GPT-4o mini ($0.15/M input and $0.60/M output).
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