Gemini 3 Flash vs o4 Mini
Complete pricing and performance comparison between Google's Gemini 3 Flash and OpenAI's o4 Mini.
Quick Verdict
Cheaper
Gemini 3 Flash
2.2x cheaper input, 1.5x cheaper output
Larger Context
Gemini 3 Flash
1.0M vs 200K
Higher Quality
Gemini 3 Flash
Score: 35 vs 33
Faster
Gemini 3 Flash
184 vs 140 tok/s
Pricing Comparison
| Spec | Gemini 3 Flash | o4 Mini | Difference |
|---|---|---|---|
| Provider | OpenAI | ||
| Input / 1M tokens | $0.5 | $1.1 | Gemini 3 Flash is 55% more expensive |
| Output / 1M tokens | $3 | $4.4 | Gemini 3 Flash is 32% more expensive |
| Context Window | 1.0M | 200K | 5x difference |
| Max Output | 66K | 100K | |
| Tokenizer | cl100k_base | o200k_base |
Performance Benchmarks
| Metric | Gemini 3 Flash | o4 Mini | Winner |
|---|---|---|---|
| Quality Index | 35 | 33 | Gemini 3 Flash |
| Output Speed | 184 tok/s | 140 tok/s | Gemini 3 Flash |
| Time to First Token | 0.80s | 32.98s | Gemini 3 Flash |
| Value (Quality/$) | 70.0 | 30.1 | Higher = better value |
Benchmark data from Artificial Analysis. Quality Index is a composite score across reasoning, coding, and knowledge tasks.
Cost at Scale
Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).
| Usage | Gemini 3 Flash | o4 Mini | Savings |
|---|---|---|---|
Single request 1K in / 300 out | $0.0014 | $0.0024 | Gemini 3 Flash saves $0.0010 |
10 requests 10K in / 3K out | $0.014 | $0.024 | Gemini 3 Flash saves $0.010 |
100 requests 100K in / 30K out | $0.140 | $0.242 | Gemini 3 Flash saves $0.102 |
1,000 requests 1M in / 300K out | $1.40 | $2.42 | Gemini 3 Flash saves $1.02 |
10,000 requests 10M in / 3M out | $14.00 | $24.20 | Gemini 3 Flash saves $10.20 |
1M requests/mo 1B in / 300M out | $1400.00 | $2420.00 | Gemini 3 Flash saves $1020.00 |
Pros & Cons
Gemini 3 Flash Strengths
- +Cheaper input tokens
- +Cheaper output tokens
- +Larger context window (1.0M vs 200K)
- +Faster output (184 vs 140 tok/s)
- +Higher quality score (35 vs 33)
- +Lower latency (faster first token)
o4 Mini Strengths
- +Higher max output tokens
When to Use Each Model
Choose Gemini 3 Flash for
- →Budget-conscious projects where cost is the primary factor
- →Long documents, large codebases, or multi-turn conversations
- →Tasks requiring maximum accuracy and reasoning
- →Real-time applications, chat, or autocomplete
Choose o4 Mini for
- →Generating long-form content or detailed code
Frequently Asked Questions
Which is cheaper, Gemini 3 Flash or o4 Mini?
For input tokens, Gemini 3 Flash is 2.2x cheaper at $0.5/1M tokens. For output tokens, Gemini 3 Flash is 1.5x cheaper at $3/1M tokens. At typical usage (1M input + 300K output), Gemini 3 Flash costs $1.40 vs o4 Mini at $2.42.
What's the context window difference?
Gemini 3 Flash supports 1.0M context (1,048,576 tokens), while o4 Mini supports 200K (200,000 tokens). Gemini 3 Flash can handle 5x more context in a single request.
Which model has better benchmarks?
Quality Index: Gemini 3 Flash scores 35 vs o4 Mini at 33. Speed: Gemini 3 Flash generates 184 tok/s vs o4 Mini at 140 tok/s. Time to first token: Gemini 3 Flash at 0.80s vs o4 Mini at 32.98s.
When should I choose Gemini 3 Flash over o4 Mini?
Choose Gemini 3 Flash when you need: Cheaper input tokens, Cheaper output tokens, Larger context window (1.0M vs 200K), Faster output (184 vs 140 tok/s), Higher quality score (35 vs 33), Lower latency (faster first token). Choose o4 Mini when you need: Higher max output tokens.
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Gemini 3 Flash = $14.00, o4 Mini = $24.20. At 10K input + 1K output per request (longer conversations): Gemini 3 Flash = $80.00, o4 Mini = $154.00.