Gemini 2.5 Flash vs GPT-4o
API pricing, context window and capabilities for Gemini 2.5 Flash and GPT-4o, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.
Verdict
computed from the published numbersGemini 2.5 Flash wins on price, on intelligence and on context window. Benchmark data is unavailable for one or both models.
Price
Gemini 2.5 Flash
Coding
Not called
Intelligence
Gemini 2.5 Flash
Context window
Gemini 2.5 Flash
Key takeaways
who wins on what, from the published numbersGemini 2.5 Flash wins
- Cheaper input ($0.15 vs $2.50 /1M)
- Cheaper output ($0.60 vs $10.00 /1M)
- Larger context window (1M vs 131K)
- Higher max output (1M vs 16K)
- More serving providers (8 vs 6)
- Has reasoning mode
- Has web search
GPT-4o wins
No clear edge on the tracked metrics.
Cheaper overall
Gemini 2.5 Flash
$0.15 + $0.60 /1M
Larger context
Gemini 2.5 Flash
1M
More providers
Gemini 2.5 Flash
8 providers
Pricing & specs
cheapest serving route · per 1M tokens| Gemini 2.5 Flash | GPT-4o | |
|---|---|---|
| Input $/1M | $0.15 best | $2.50 |
| Output $/1M | $0.60 best | $10.00 |
| Context window | 1M best | 131K |
| Max output | 1M best | 16K |
| Serving providers | 8 best | 6 |
| Released | 2025-06-17 | 2024-05-13 |
Benchmarks
Artificial Analysis indices, side by side| Gemini 2.5 Flash | GPT-4o | |
|---|---|---|
| Intelligence | 14.1 best | 11.2 |
| GPQA Diamond | 68% best | 54% |
| Output speed | 233 t/s best | 99 t/s |
| Latency (TTFT) | 4.98s best | 5.19s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 2.5 Flash
via OCI
$1.35
GPT-4o
via Azure
$23
Capabilities
feature support, side by side| Feature | Gemini 2.5 Flash | GPT-4o |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | — |
| Audio | ✓ | ✓ |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Gemini 2.5 Flash or GPT-4o?
Gemini 2.5 Flash is cheaper for input ($0.15 vs $2.50 per 1M tokens). Gemini 2.5 Flash is cheaper for output ($0.60 vs $10.00 per 1M tokens).
What is the context window difference between Gemini 2.5 Flash and GPT-4o?
Gemini 2.5 Flash has a 1M-token context window and GPT-4o has 131K tokens, so Gemini 2.5 Flash can take a larger prompt.
How do Gemini 2.5 Flash and GPT-4o compare on benchmarks?
On the tracked Artificial Analysis indices, Gemini 2.5 Flash leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
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