Gemini 2.5 Pro vs GPT-5.4 Nano
Complete pricing and performance comparison between Google's Gemini 2.5 Pro and OpenAI's GPT-5.4 Nano.
Quick Verdict
Cheaper
GPT-5.4 Nano
6.3x cheaper input, 8.0x cheaper output
Larger Context
Gemini 2.5 Pro
1.0M vs 400K
Pricing Comparison
| Spec | Gemini 2.5 Pro | GPT-5.4 Nano | Difference |
|---|---|---|---|
| Provider | OpenAI | ||
| Input / 1M tokens | $1.25 | $0.2 | GPT-5.4 Nano is 84% more expensive |
| Output / 1M tokens | $10 | $1.25 | GPT-5.4 Nano is 88% more expensive |
| Context Window | 1.0M | 400K | 3x difference |
| Max Output | 66K | 128K | |
| Tokenizer | cl100k_base | o200k_base |
Performance Benchmarks
| Metric | Gemini 2.5 Pro | GPT-5.4 Nano | Winner |
|---|---|---|---|
| Quality Index | 35 | -- | N/A |
| Output Speed | 124 tok/s | -- | N/A |
| Value (Quality/$) | 27.7 | -- | 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 2.5 Pro | GPT-5.4 Nano | Savings |
|---|---|---|---|
Single request 1K in / 300 out | $0.0042 | $0.0006 | GPT-5.4 Nano saves $0.0037 |
10 requests 10K in / 3K out | $0.042 | $0.0057 | GPT-5.4 Nano saves $0.037 |
100 requests 100K in / 30K out | $0.425 | $0.058 | GPT-5.4 Nano saves $0.367 |
1,000 requests 1M in / 300K out | $4.25 | $0.575 | GPT-5.4 Nano saves $3.67 |
10,000 requests 10M in / 3M out | $42.50 | $5.75 | GPT-5.4 Nano saves $36.75 |
1M requests/mo 1B in / 300M out | $4250.00 | $575.00 | GPT-5.4 Nano saves $3675.00 |
Pros & Cons
Gemini 2.5 Pro Strengths
- +Larger context window (1.0M vs 400K)
GPT-5.4 Nano Strengths
- +Cheaper input tokens
- +Cheaper output tokens
- +Higher max output tokens
When to Use Each Model
Choose Gemini 2.5 Pro for
- →Long documents, large codebases, or multi-turn conversations
Choose GPT-5.4 Nano for
- →Budget-conscious projects where cost is the primary factor
- →Generating long-form content or detailed code
Frequently Asked Questions
Which is cheaper, Gemini 2.5 Pro or GPT-5.4 Nano?
For input tokens, GPT-5.4 Nano is 6.3x cheaper at $0.2/1M tokens. For output tokens, GPT-5.4 Nano is 8.0x cheaper at $1.25/1M tokens. At typical usage (1M input + 300K output), Gemini 2.5 Pro costs $4.25 vs GPT-5.4 Nano at $0.575.
What's the context window difference?
Gemini 2.5 Pro supports 1.0M context (1,048,576 tokens), while GPT-5.4 Nano supports 400K (400,000 tokens). Gemini 2.5 Pro can handle 3x more context in a single request.
Which model has better benchmarks?
When should I choose Gemini 2.5 Pro over GPT-5.4 Nano?
Choose Gemini 2.5 Pro when you need: Larger context window (1.0M vs 400K). Choose GPT-5.4 Nano when you need: Cheaper input tokens, Cheaper output tokens, Higher max output tokens.
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Gemini 2.5 Pro = $42.50, GPT-5.4 Nano = $5.75. At 10K input + 1K output per request (longer conversations): Gemini 2.5 Pro = $225.00, GPT-5.4 Nano = $32.50.
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