Gemini 2.5 Flash vs GPT-3.5 Turbo (older v0613) (Comparative Analysis)
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Comparative Analysis: Gemini 2.5 Flash vs. GPT-3.5 Turbo (older v0613)
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Overview
GPT-3.5 Turbo (older v0613) was released 1 year before Gemini 2.5 Flash.
 Gemini 2.5 Flash |  GPT-3.5 Turbo (older v0613) | |
|---|---|---|
Model Provider The organization behind this AI's development | Google | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 4.1K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 65.5K tokens | 4.1K tokens |
Release Date When this model first became publicly available | June 17, 2025 1 year ago June 17th, 2025 | January 25, 2024 2 years ago January 25th, 2024 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | September 30, 2021 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Gemini 2.5 Flash | GPT-3.5 Turbo (older v0613) | |
|---|---|---|
Input Types Supported input formats | 📁File🖼️Image📝Text🎵Audio🎬Video | 📝Text |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Not reported |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Gemini | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured OutputReasoning ModeContent Moderation |
Pricing
Gemini 2.5 Flash is roughly 0.3x less expensive compared to GPT-3.5 Turbo (older v0613) for input tokens and roughly 1.3x more expensive for output tokens.
| Gemini 2.5 Flash | GPT-3.5 Turbo (older v0613) | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.30 per million tokens | $1.00 per million tokens |
Output Token Cost Cost per million output tokens | $2.50 per million tokens | $2.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.014 per search | Not specified |
Cache Read Cost Cost to reuse cached input tokens | $0.03 per million tokens | Not specified |
Cache Write Cost Cost to write input tokens to the cache | $0.08 per million tokens | Not specified |
Reasoning Token Cost Cost for internal reasoning tokens | $2.50 per million tokens | Not specified |
Image Input Cost Additional cost for each image input | $0.0000003 per image | Not specified |
Audio Input Cost Additional cost for audio input | $0.000001 per unit | Not specified |
Audio Cache Cost Cost to reuse cached audio input tokens | $0.10 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Gemini 2.5 Flash and GPT-3.5 Turbo (older v0613).
| Gemini 2.5 Flash | GPT-3.5 Turbo (older v0613) | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,159 Elo (#67 in Data Viz (48.4% win rate)) | Benchmark not available. |
At a Glance
Quick overview of what makes Gemini 2.5 Flash and GPT-3.5 Turbo (older v0613) unique.
Gemini 2.5 Flash by Google understands both text and images, handles audio, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $0.30/M input and $2.50/M output tokens. Released June 17th, 2025.GPT-3.5 Turbo (older v0613) by OpenAI can use external tools and APIs, generates structured data. It can handle standard conversations with its 4.1K token context window. Reasonably priced at $1.00/M input and $2.00/M output tokens. Released January 25th, 2024.Explore More Comparisons
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Compare GPT-3.5 Turbo (older v0613) with:
🚀Programming
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Models optimized for creative writing
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Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
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