Gemini 2.5 Pro vs GPT-3.5 Turbo (older v0613)
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Gemini 2.5 Pro and GPT-3.5 Turbo (older v0613).
Gemini 2.5 Pro
Gemini 2.5 Pro is Google’s state-of-the-art AI model designed for advanced reasoning, coding, mathematics, and scientific tasks. It employs “thinking” capabilities, enabling it to reason through responses with enhanced accuracy...
GPT-3.5 Turbo (older v0613)
GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natural language or code, and is optimized for chat and traditional completion tasks. Training data up to Sep 2021.
Technical Specifications
| Specification | Gemini 2.5 Pro | GPT-3.5 Turbo (older v0613) |
|---|---|---|
| Provider | OpenAI | |
| Context Window | 1,048,576 tokens | 4,095 tokens |
| Agent Suitability | 90/100 | N/A |
| Time to First Token (TTFT) | 450 ms | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2025-06-17 | 2024-01-25 |
API Pricing Comparison
Input Price per Million Tokens
Gemini 2.5 Pro
$1.25
GPT-3.5 Turbo (older v0613)
$1.00
Output Price per Million Tokens
Gemini 2.5 Pro
$10.00
GPT-3.5 Turbo (older v0613)
$2.00
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Gemini 2.5 Pro Quirks & Gotchas
- ▸Legacy model — migrate to Gemini 3.1 Pro for better tool calling and lower latency
GPT-3.5 Turbo (older v0613) Quirks & Gotchas
No developer gotchas reported.