Last verified 2025-09-22 (left) · 2025-09-22 (right)
Gemini 2.5 Flash vs o3-pro — Pricing & Capability Comparison
Gemini 2.5 Flash charges $0.30 per million input tokens and $2.50 per million output tokens. o3-pro comes in at $20.00 / $80.00. Context windows span 1M vs 200K tokens respectively.
Input price (per 1M)
Gemini 2.5 Flash
$0.30
o3-pro
$20.00
Gemini 2.5 Flash leads here
Output price (per 1M)
Gemini 2.5 Flash
$2.50
o3-pro
$80.00
Gemini 2.5 Flash leads here
Context window
Gemini 2.5 Flash
1,000,000 tokens
o3-pro
200,000 tokens
Gemini 2.5 Flash leads here
Cached input
Gemini 2.5 Flash
Not published
o3-pro
Not published
No published data
Cost comparison for 10K-token workloads
Side-by-side pricing for identical workloads (10,000 total tokens per request) across different distributions.
| Scenario | Gemini 2.5 Flash | o3-pro |
|---|---|---|
Balanced conversation 50% input · 50% output | $0.0140 | $0.500 |
Input-heavy workflow 80% input · 20% output | $0.0074 | $0.320 |
Generation heavy 30% input · 70% output | $0.0184 | $0.620 |
Cached system prompt 90% cached input · 10% fresh output | $0.0052 | $0.260 |
Frequently asked questions
Which model is cheaper per million input tokens?
Gemini 2.5 Flash costs $0.30 per million input tokens versus $20.00 for o3-pro.
How do output prices compare?
Gemini 2.5 Flash charges $2.50 per million output tokens, while o3-pro costs $80.00 per million.
Which model supports a larger context window?
Gemini 2.5 Flash offers 1,000,000 tokens (1M) versus 200K for o3-pro.