Gemini 2.5 Pro vs o3-mini: Detailed Comparison
Choosing between Gemini 2.5 Pro (Google) and
o3-mini (OpenAI) comes down to three things:
per-token pricing, context window, and which capability matters most for your workload.
Gemini 2.5 Pro costs $1.25/M input vs
$1.10/M for o3-mini;
context windows are 2.0M vs
200K tokens. Detailed breakdown below.
Side-by-side specs
| Spec | Gemini 2.5 Pro | o3-mini |
|---|
| Provider | Google | OpenAI |
|---|
| Released | 2025-03-25 | 2025-01-31 |
|---|
| Input price |
$1.25/M |
$1.10/M |
| Output price |
$10.00/M |
$4.40/M |
| Cached input |
$0.3100/M |
$0.5500/M |
| Context window |
2.0M |
200K |
| Max output |
66K |
100K |
| Modalities |
text image audio video |
text |
| Tokenizer |
gemini |
o200k_base |
Capability matrix
| Capability | Gemini 2.5 Pro | o3-mini |
|---|
| function calling |
Yes |
Yes |
| json mode |
Yes |
Yes |
| vision |
Yes |
No |
| streaming |
Yes |
No |
| audio |
Yes |
No |
| video |
Yes |
No |
| thinking |
Yes |
No |
| reasoning |
No |
Yes |
Benchmark comparison
Higher is better for all benchmarks shown.
Per-call cost on typical workloads
| Workload (in/out tokens) | Gemini 2.5 Pro | o3-mini | Cheaper by |
|---|
| Standard chat (1K / 500) |
$0.006250 |
$0.003300 |
o3-mini by $0.002950 |
| RAG (4K / 500) |
$0.010000 |
$0.006600 |
o3-mini by $0.003400 |
| Long doc (20K / 1K) |
$0.035000 |
$0.026400 |
o3-mini by $0.008600 |
| Very long context (100K / 2K) |
$0.140000 |
$0.116600 |
o3-mini by $0.023400 |
When to choose Gemini 2.5 Pro over o3-mini
- Larger context window (2.0M vs 200K) — relevant when whole documents or long histories must fit in a single call.
- Supports vision — o3-mini does not.
- Supports streaming — o3-mini does not.
- Supports audio — o3-mini does not.
- Supports video — o3-mini does not.
- Supports thinking — o3-mini does not.
When to choose o3-mini over Gemini 2.5 Pro
- Per-token input cost is 12% lower than Gemini 2.5 Pro.
- Supports reasoning — Gemini 2.5 Pro does not.
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